1
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Jayatissa H, Avila ML, Rehm KE, Mohr P, Meisel Z, Chen J, Hoffman CR, Liang J, Müller-Gatermann C, Neto D, Ong WJ, Psaltis A, Santiago-Gonzalez D, Tang TL, Ugalde C, Wilson G. Study of the ^{22}Mg Waiting Point Relevant for X-Ray Burst Nucleosynthesis via the ^{22}Mg(α,p)^{25}Al Reaction. Phys Rev Lett 2023; 131:112701. [PMID: 37774292 DOI: 10.1103/physrevlett.131.112701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2022] [Revised: 02/21/2023] [Accepted: 08/08/2023] [Indexed: 10/01/2023]
Abstract
The ^{22}Mg(α,p)^{25}Al reaction rate has been identified as a major source of uncertainty for understanding the nucleosynthesis flow in Type-I x-ray bursts. We report a direct measurement of the energy- and angle-integrated cross sections of this reaction in a 3.3-6.9 MeV center-of-mass energy range using the MUlti-Sampling Ionization Chamber (MUSIC). The new ^{22}Mg(α,p)^{25}Al reaction rate is a factor of ∼4 higher than the previous direct measurement of this reaction within temperatures relevant for x-ray bursts, resulting in the ^{22}Mg waiting point of x-ray burst nucleosynthesis flow to be significantly bypassed via the (α,p) reaction.
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Affiliation(s)
- H Jayatissa
- Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - M L Avila
- Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - K E Rehm
- Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - P Mohr
- Institute for Nuclear Research (Atomki), P.O. Box 51, Debrecen H-4001, Hungary
| | - Z Meisel
- Institute of Nuclear and Particle Physics, Ohio University, Athens, Ohio 45701, USA
| | - J Chen
- Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - C R Hoffman
- Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - J Liang
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada
| | - C Müller-Gatermann
- Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - D Neto
- Department of Physics, University of Illinois Chicago, 845 W. Taylor St., Chicago, Illinois 60607, USA
| | - W J Ong
- Lawrence Livermore National Laboratory, 7000 East Ave, Livermore, California 94550, USA
| | - A Psaltis
- Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt D-64289, Germany
| | | | - T L Tang
- Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - C Ugalde
- Department of Physics, University of Illinois Chicago, 845 W. Taylor St., Chicago, Illinois 60607, USA
| | - G Wilson
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
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2
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Kinoshita N, Paul M, Kashiv Y, Collon P, Deibel CM, DiGiovine B, Greene JP, Jiang CL, Marley ST, Pardo RC, Rehm KE, Robertson D, Scott R, Schmitt C, Tang XD, Vondrasek R, Yokoyama A. Retraction. Science 2023; 379:1307. [PMID: 36996231 DOI: 10.1126/science.adh7739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/01/2023]
Affiliation(s)
- N Kinoshita
- Shimizu Corporation Institute of Technology, Tokyo, Japan
| | - M Paul
- Hebrew University of Jerusalem, Jerusalem, Israel
| | - Y Kashiv
- University of Notre Dame, Notre Dame, IN, USA
| | - P Collon
- University of Notre Dame, Notre Dame, IN, USA
| | - C M Deibel
- Louisiana State University, Baton Rouge, LA, USA
| | - B DiGiovine
- Los Alamos National Laboratory, Los Alamos, NM, USA
| | - J P Greene
- Argonne National Laboratory, Argonne, IL, USA
| | - C L Jiang
- Argonne National Laboratory, Argonne, IL, USA
| | - S T Marley
- Louisiana State University, Baton Rouge, LA, USA
| | - R C Pardo
- Argonne National Laboratory, Argonne, IL, USA
| | - K E Rehm
- Argonne National Laboratory, Argonne, IL, USA
| | - D Robertson
- University of Notre Dame, Notre Dame, IN, USA
| | - R Scott
- Argonne National Laboratory, Argonne, IL, USA
| | - C Schmitt
- University of Notre Dame, Notre Dame, IN, USA
| | - X D Tang
- Institute of Modern Physics, Lanzhou, China
| | - R Vondrasek
- Argonne National Laboratory, Argonne, IL, USA
| | - A Yokoyama
- Kanazawa University, Kakumamachi, Kanazawa, Ishikawa, Japan
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3
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Tessler M, Paul M, Halfon S, Meyer BS, Pardo R, Purtschert R, Rehm KE, Scott R, Weigand M, Weissman L, Almaraz-Calderon S, Avila ML, Baggenstos D, Collon P, Hazenshprung N, Kashiv Y, Kijel D, Kreisel A, Reifarth R, Santiago-Gonzalez D, Shor A, Silverman I, Talwar R, Veltum D, Vondrasek R. Stellar ^{36,38}Ar(n,γ)^{37,39}Ar Reactions and Their Effect on Light Neutron-Rich Nuclide Synthesis. Phys Rev Lett 2018; 121:112701. [PMID: 30265109 DOI: 10.1103/physrevlett.121.112701] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2018] [Revised: 07/24/2018] [Indexed: 06/08/2023]
Abstract
The ^{36}Ar(n,γ)^{37}Ar (t_{1/2}=35 d) and ^{38}Ar(n,γ)^{39}Ar (269 yr) reactions were studied for the first time with a quasi-Maxwellian (kT∼47 keV) neutron flux for Maxwellian average cross section (MACS) measurements at stellar energies. Gas samples were irradiated at the high-intensity Soreq applied research accelerator facility-liquid-lithium target neutron source and the ^{37}Ar/^{36}Ar and ^{39}Ar/^{38}Ar ratios in the activated samples were determined by accelerator mass spectrometry at the ATLAS facility (Argonne National Laboratory). The ^{37}Ar activity was also measured by low-level counting at the University of Bern. Experimental MACS of ^{36}Ar and ^{38}Ar, corrected to the standard 30 keV thermal energy, are 1.9(3) and 1.3(2) mb, respectively, differing from the theoretical and evaluated values published to date by up to an order of magnitude. The neutron-capture cross sections of ^{36,38}Ar are relevant to the stellar nucleosynthesis of light neutron-rich nuclides; the two experimental values are shown to affect the calculated mass fraction of nuclides in the region A=36-48 during the weak s process. The new production cross sections have implications also for the use of ^{37}Ar and ^{39}Ar as environmental tracers in the atmosphere and hydrosphere.
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Affiliation(s)
- M Tessler
- Racah Institute of Physics, Hebrew University, Jerusalem 91904, Israel
| | - M Paul
- Racah Institute of Physics, Hebrew University, Jerusalem 91904, Israel
| | | | - B S Meyer
- Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634, USA
| | - R Pardo
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - R Purtschert
- Physics Institute, University of Bern, 3012 Bern, Switzerland
| | - K E Rehm
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - R Scott
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - M Weigand
- Goethe University Frankfurt, Frankfurt 60438, Germany
| | | | | | - M L Avila
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - D Baggenstos
- Physics Institute, University of Bern, 3012 Bern, Switzerland
| | - P Collon
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | | | - Y Kashiv
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - D Kijel
- Soreq NRC, Yavne 81800, Israel
| | | | - R Reifarth
- Goethe University Frankfurt, Frankfurt 60438, Germany
| | - D Santiago-Gonzalez
- Argonne National Laboratory, Argonne, Illinois 60439, USA
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - A Shor
- Soreq NRC, Yavne 81800, Israel
| | | | - R Talwar
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - D Veltum
- Goethe University Frankfurt, Frankfurt 60438, Germany
| | - R Vondrasek
- Argonne National Laboratory, Argonne, Illinois 60439, USA
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4
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Almaraz-Calderon S, Rehm KE, Gerken N, Avila ML, Kay BP, Talwar R, Ayangeakaa AD, Bottoni S, Chen AA, Deibel CM, Dickerson C, Hanselman K, Hoffman CR, Jiang CL, Kuvin SA, Nusair O, Pardo RC, Santiago-Gonzalez D, Sethi J, Ugalde C. Study of the ^{26}Al^{m}(d,p)^{27}Al Reaction and the Influence of the ^{26}Al 0^{+} Isomer on the Destruction of ^{26}Al in the Galaxy. Phys Rev Lett 2017; 119:072701. [PMID: 28949677 DOI: 10.1103/physrevlett.119.072701] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2017] [Indexed: 06/07/2023]
Abstract
The existence of ^{26}Al (t_{1/2}=7.17×10^{5} yr) in the interstellar medium provides a direct confirmation of ongoing nucleosynthesis in the Galaxy. The presence of a low-lying 0^{+} isomer (^{26}Al^{m}), however, severely complicates the astrophysical calculations. We present for the first time a study of the ^{26}Al^{m}(d,p)^{27}Al reaction using an isomeric ^{26}Al beam. The selectivity of this reaction allowed the study of ℓ=0 transfers to T=1/2, and T=3/2 states in ^{27}Al. Mirror symmetry arguments were then used to constrain the ^{26}Al^{m}(p,γ)^{27}Si reaction rate and provide an experimentally determined upper limit of the rate for the destruction of isomeric ^{26}Al via radiative proton capture reactions, which is expected to dominate the destruction path of ^{26}Al^{m} in asymptotic giant branch stars, classical novae, and core collapse supernovae.
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Affiliation(s)
- S Almaraz-Calderon
- Department of Physics, Florida State University, Tallahassee, Florida 32306, USA
| | - K E Rehm
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - N Gerken
- Department of Physics, Florida State University, Tallahassee, Florida 32306, USA
| | - M L Avila
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - B P Kay
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - R Talwar
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - A D Ayangeakaa
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - S Bottoni
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - A A Chen
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada
| | - C M Deibel
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - C Dickerson
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - K Hanselman
- Department of Physics, Florida State University, Tallahassee, Florida 32306, USA
| | - C R Hoffman
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - C L Jiang
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - S A Kuvin
- Department of Physics, University of Connecticut, Storrs, Connecticut 06269, USA
| | - O Nusair
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - R C Pardo
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - D Santiago-Gonzalez
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - J Sethi
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - C Ugalde
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
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5
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Rehm KE. The Influence of Nuclear Reactions and Nuclear Structure in Astrophysics. EPJ Web Conf 2017. [DOI: 10.1051/epjconf/201716300048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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6
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Rehm KE, Sunesara I, Tull MT, Marshall GD. Psychological stress moderates the relationship between running volume and CD4+ T cell subpopulations. J BIOL REG HOMEOS AG 2016; 30:449-457. [PMID: 27358131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Endurance-based exercise training can lead to alterations in components of the immune system, but it is unknown how psychological stress (another potent immunomodulator) may impact these changes. The purpose of this study was to determine the moderating role of psychological stress on exercise-induced immune changes. Twenty-nine recreational runners were recruited for this study four weeks before completing a marathon. Each subject reported: weekly training volume (miles/wk) for the week prior to the study visit; completed the Perceived Stress Scale (PSS), the state version of the State-Trait Anxiety Inventory (STAI) and the Penn State Worry Questionnaire (PSWQ); and donated blood for assessment of CD4+ T cell subpopulations and mitogen-induced cytokine production. Participants ran an average of 30 (±13.4) miles (1 mile=1.6 km) per week. Average values (SD) for immune biomarkers were: regulatory T cells (Treg), 3.2% (±1.2%); type 1 regulatory cells (Tr1), 27.1% (±8.3%); T helper 3 (Th3), 1.8% (±0.7%); interferon gamma (IFNγ), 3.1 pg/ml (±1.0); interleukin (IL)-4, 1.4 pg/ml (±1.1); IFNγ/IL-4, 8.6 (±1.2); IL-10, 512 pg/ml (±288). There was a significant relationship between running volume and both Treg cell numbers (slope of the regression line (β)=0.05, p less than 0.001) and IL-10 production β=-10.6, p=0.002), and there was a trending relationship between running volume and Tr1 cell numbers (β=-0.2%, p=0.064). Perceived stress was a trending moderator of the running volume-Treg relationship, whereas worry was a significant moderator of the running volume-IFNγ and running volume-IFNγ/IL-4 relationships. These data indicate that various forms of psychological stress can impact endurance exercise-based changes in certain immune biomarkers. These changes may reflect an increased susceptibility to clinical risks in some individuals.
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Affiliation(s)
- K E Rehm
- Laboratory of Behavioral Immunology Research, Division of Clinical Immunology and Allergy, University of Mississippi Medical Center, Jackson, MS, USA; Department of Medicine, University of Mississippi Medical Center, Jackson, MS, USA
| | - I Sunesara
- Laboratory of Behavioral Immunology Research, Division of Clinical Immunology and Allergy, University of Mississippi Medical Center, Jackson, MS, USA; Center of Biostatistics and Bioinformatics, University of Mississippi Medical Center, Jackson, MS, USA
| | - M T Tull
- Lab. of Behavioral Immunology Research, Div. of Clinic. Immunology and Allergy, Univ. of Mississippi Medical Center, Jackson, MS; Division of Psychology, Dept. of Psychiatry and Human Behavior, Univ. of Mississippi Medical Medical Center, Jackson, USA
| | - G D Marshall
- Laboratory of Behavioral Immunology Research, Division of Clinical Immunology and Allergy, University of Mississippi Medical Center, Jackson, MS, USA; Department of Medicine, University of Mississippi Medical Center, Jackson, MS, USA
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Avila ML, Rehm KE, Almaraz-Calderon S, Carnelli PFF, DiGiovine B, Esbensen H, Hoffman CR, Jiang CL, Kay BP, Lai J, Nusair O, Pardo RC, Santiago-Gonzalez D, Talwar R, Ugalde C. Study of the 20,22Ne+ 20,22Ne and 10,12,13,14,15C+ 12C Fusion Reactions with MUSIC. EPJ Web of Conferences 2016. [DOI: 10.1051/epjconf/201611708009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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8
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Rehm KE. Reactions on the surface and inside of neutron stars. EPJ Web of Conferences 2016. [DOI: 10.1051/epjconf/201610904001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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9
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Almaraz-Calderon S, Bertone PF, Alcorta M, Albers M, Deibel CM, Hoffman CR, Jiang CL, Marley ST, Rehm KE, Ugalde C. Erratum: Direct Measurement of the (23)Na(α,p)(26)Mg Reaction Cross Section at Energies Relevant for the Production of Galactic (26)Al [Phys. Rev. Lett. 112, 152701 (2014)]. Phys Rev Lett 2015; 115:179901. [PMID: 26551146 DOI: 10.1103/physrevlett.115.179901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2015] [Indexed: 06/05/2023]
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10
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Almaraz-Calderon S, Carnelli PFF, Rehm KE, Albers M, Alcorta M, Bertone PF, Digiovine B, Esbensen H, Fernandez Niello JO, Henderson D, Jiang CL, Lai J, Marley ST, Nusair O, Palchan-Hazan T, Pardo RC, Paul M, Ugalde C. C+C Fusion Cross Sections Measurements for Nuclear Astrophysics. EPJ Web of Conferences 2015. [DOI: 10.1051/epjconf/20159601001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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11
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Jiang CL, Stefanini AM, Esbensen H, Rehm KE, Almaraz-Calderon S, Back BB, Corradi L, Fioretto E, Montagnoli G, Scarlassara F, Montanari D, Courtin S, Bourgin D, Haas F, Goasduff A, Szilner S, Mijatovic T. Fusion hindrance for a positive-q-value system (24)Mg+(30)Si. Phys Rev Lett 2014; 113:022701. [PMID: 25062170 DOI: 10.1103/physrevlett.113.022701] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2014] [Indexed: 06/03/2023]
Abstract
Measurements of the excitation function for the fusion of (24)Mg+(30)Si (Q=17.89 MeV)have been extended toward lower energies with respect to previous experimental data. The S-factor maximum observed in this large, positive-Q-value system is the most pronounced among such systems studied thus far. The significance and the systematics of an S-factor maximum in systems with positive fusion Q values are discussed. This result would strongly impact the extrapolated cross sections and reaction rates in the carbon and oxygen burnings and, thus, the study of the history of stellar evolution.
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Affiliation(s)
- C L Jiang
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - A M Stefanini
- INFN, Laboratori Nazionali di Legnaro, I-35020 Legnaro (Padova), Italy
| | - H Esbensen
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - K E Rehm
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - S Almaraz-Calderon
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - B B Back
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - L Corradi
- INFN, Laboratori Nazionali di Legnaro, I-35020 Legnaro (Padova), Italy
| | - E Fioretto
- INFN, Laboratori Nazionali di Legnaro, I-35020 Legnaro (Padova), Italy
| | - G Montagnoli
- Dipartimento di Fisica e Astronomia, Universitá di Padova, and INFN, Sezione di Padova, IT-35131 Padova, Italy
| | - F Scarlassara
- Dipartimento di Fisica e Astronomia, Universitá di Padova, and INFN, Sezione di Padova, IT-35131 Padova, Italy
| | - D Montanari
- Dipartimento di Fisica e Astronomia, Universitá di Padova, and INFN, Sezione di Padova, IT-35131 Padova, Italy
| | - S Courtin
- IPHC and University of Strasbourg, CNRS/IN2P3,67037 Strasbourg Cedex2, France
| | - D Bourgin
- IPHC and University of Strasbourg, CNRS/IN2P3,67037 Strasbourg Cedex2, France
| | - F Haas
- IPHC and University of Strasbourg, CNRS/IN2P3,67037 Strasbourg Cedex2, France
| | - A Goasduff
- CSNSM, CNRS/IN2P3 and University Paris-Sud, F-91405 Orsay Campus, France
| | - S Szilner
- Ruder Boskovic Institute, HR-10002 Zagreb, Croatia
| | - T Mijatovic
- Ruder Boskovic Institute, HR-10002 Zagreb, Croatia
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Carnelli PFF, Almaraz-Calderon S, Rehm KE, Albers M, Alcorta M, Bertone PF, Digiovine B, Esbensen H, Niello JOF, Henderson D, Jiang CL, Lai J, Marley ST, Nusair O, Palchan-Hazan T, Pardo RC, Paul M, Ugalde C. Measurements of fusion reactions of low-intensity radioactive carbon beams on 12C and their implications for the understanding of X-ray bursts. Phys Rev Lett 2014; 112:192701. [PMID: 24877935 DOI: 10.1103/physrevlett.112.192701] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2014] [Indexed: 06/03/2023]
Abstract
The interaction between neutron-rich nuclei plays an important role for understanding the reaction mechanism of the fusion process as well as for the energy production through pycnonuclear reactions in the crust of neutron stars. We have performed the first measurements of the total fusion cross sections in the systems (10,14,15)C+(12)C using a new active target-detector system. In the energy region accessible with existing radioactive beams, a good agreement between the experimental and theoretical cross sections is observed. This gives confidence in our ability to calculate fusion cross sections for systems which are outside the range of today's radioactive beam facilities.
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Affiliation(s)
- P F F Carnelli
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA and Laboratorio Tandar, Comisión Nacional de Energía Atómica, B1650KNA San Martín, Buenos Aires, Argentina and Consejo Nacional de Investigaciones Científicas y Técnicas, C1033AAJ Buenos Aires, Argentina
| | - S Almaraz-Calderon
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - K E Rehm
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - M Albers
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - M Alcorta
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - P F Bertone
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - B Digiovine
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - H Esbensen
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - J O Fernández Niello
- Laboratorio Tandar, Comisión Nacional de Energía Atómica, B1650KNA San Martín, Buenos Aires, Argentina and Escuela de Ciencia y Tecnología, Universidad de San Martín, B1650BWA San Martín, Buenos Aires, Argentina
| | - D Henderson
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - C L Jiang
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - J Lai
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - S T Marley
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - O Nusair
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - T Palchan-Hazan
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - R C Pardo
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - M Paul
- Racah Institute of Physics, Hebrew University, Jerusalem 91904, Israel
| | - C Ugalde
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
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13
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Almaraz-Calderon S, Bertone PF, Alcorta M, Albers M, Deibel CM, Hoffman CR, Jiang CL, Marley ST, Rehm KE, Ugalde C. Direct measurement of the (23)Na(α,p)(26)Mg reaction cross section at energies relevant for the production of galactic (26)Al. Phys Rev Lett 2014; 112:152701. [PMID: 24785033 DOI: 10.1103/physrevlett.112.152701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2013] [Indexed: 06/03/2023]
Abstract
The 1809-keV γ ray from the decay of (26)Al(g) is an important target for γ-ray astronomy. In the convective C/Ne burning shell of massive presupernova stars, the (23)Na(α,p)(26)Mg reaction directly influences the production of (26)Al. We have performed a direct measurement of the (23)Na(α,p)(26)Mg reaction cross section at the appropriate astrophysically important energies. The stellar rate calculated in the present work is larger than the recommended rate by nearly a factor of 40 and could strongly affect the production of (26)Al in massive stars.
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Affiliation(s)
- S Almaraz-Calderon
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - P F Bertone
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - M Alcorta
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - M Albers
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - C M Deibel
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - C R Hoffman
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - C L Jiang
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - S T Marley
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - K E Rehm
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - C Ugalde
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA and Department of Astronomy and Astrophysics, University of Chicago, Chicago, Illinois 60637, USA
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14
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Wuosmaa AH, Bedoor S, Alcorta M, Back BB, Brown BA, Deibel CM, Hoffman CR, Lighthall JC, Marley ST, Pardo RC, Rehm KE, Rogers AM, Schiffer JP, Shetty DV. Evolution of Single-Particle Energies for N=9 Nuclei at Large N/Z. EPJ Web of Conferences 2014. [DOI: 10.1051/epjconf/20146603098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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15
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Jiang CL, Back BB, Esbensen H, Janssens RVF, Rehm KE, Charity RJ. Origin and consequences of 12C+12C fusion resonances at deep sub-barrier energies. Phys Rev Lett 2013; 110:072701. [PMID: 25166370 DOI: 10.1103/physrevlett.110.072701] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2012] [Indexed: 06/03/2023]
Abstract
Previous explanations for the resonance behavior of (12)C+(12)C fusion at low energies were based on a nonresonant compound-nucleus background and an additional contribution from a series of resonances. This separation into "resonance" and "background" contributions of the cross section is artificial. We propose to explain this phenomenon through the impact on the cross section of the relatively large spacings and the narrow widths of (24)Mg compound levels in the corresponding excitation-energy region.
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Affiliation(s)
- C L Jiang
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - B B Back
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - H Esbensen
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - R V F Janssens
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - K E Rehm
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - R J Charity
- Department of Chemistry, Washington University, St. Louis, Missouri 63130, USA
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16
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Freedman SJ, Rehm KE, Schiffer JP, Seweryniak D. Comment on "Precise determination of the unperturbed 8B neutrino spectrum". Phys Rev Lett 2012; 109:189201-189202. [PMID: 23215342 DOI: 10.1103/physrevlett.109.189201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2012] [Indexed: 06/01/2023]
Affiliation(s)
- S J Freedman
- Physics Department, University of California, Berkeley and Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
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17
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Kinoshita N, Paul M, Kashiv Y, Collon P, Deibel CM, DiGiovine B, Greene JP, Henderson DJ, Jiang CL, Marley ST, Nakanishi T, Pardo RC, Rehm KE, Robertson D, Scott R, Schmitt C, Tang XD, Vondrasek R, Yokoyama A. A Shorter
146
Sm Half-Life Measured and Implications for
146
Sm-
142
Nd Chronology in the Solar System. Science 2012; 335:1614-7. [PMID: 22461609 DOI: 10.1126/science.1215510] [Citation(s) in RCA: 139] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
The extinct p-process nuclide (146)Sm serves as an astrophysical and geochemical chronometer through measurements of isotopic anomalies of its α-decay daughter (142)Nd. Based on analyses of (146)Sm/(147)Sm α-activity and atom ratios, we determined the half-life of (146)Sm to be 68 ± 7 (1σ) million years, which is shorter than the currently used value of 103 ± 5 million years. This half-life value implies a higher initial (146)Sm abundance in the early solar system, ((146)Sm/(144)Sm)(0) = 0.0094 ± 0.0005 (2σ), than previously estimated. Terrestrial, lunar, and martian planetary silicate mantle differentiation events dated with (146)Sm-(142)Nd converge to a shorter time span and in general to earlier times, due to the combined effect of the new (146)Sm half-life and ((146)Sm/(144)Sm)(0) values.
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Affiliation(s)
- N. Kinoshita
- Research Facility Center for Science and Technology, University of Tsukuba, Japan
| | - M. Paul
- Racah Institute of Physics, Hebrew University, Jerusalem, Israel 91904
| | - Y. Kashiv
- Department of Physics, University of Notre Dame, Notre Dame, IN 46556–5670, USA
| | - P. Collon
- Department of Physics, University of Notre Dame, Notre Dame, IN 46556–5670, USA
| | - C. M. Deibel
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, MI 46624, USA
| | - B. DiGiovine
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
| | - J. P. Greene
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
| | - D. J. Henderson
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
| | - C. L. Jiang
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
| | - S. T. Marley
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
| | - T. Nakanishi
- Faculty of Chemistry, Institute of Science and Engineering, Kanazawa University, Japan
| | - R. C. Pardo
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
| | - K. E. Rehm
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
| | - D. Robertson
- Department of Physics, University of Notre Dame, Notre Dame, IN 46556–5670, USA
| | - R. Scott
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
| | - C. Schmitt
- Department of Physics, University of Notre Dame, Notre Dame, IN 46556–5670, USA
| | - X. D. Tang
- Department of Physics, University of Notre Dame, Notre Dame, IN 46556–5670, USA
| | - R. Vondrasek
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
| | - A. Yokoyama
- Faculty of Chemistry, Institute of Science and Engineering, Kanazawa University, Japan
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18
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Alcorta M, Rehm KE, Back BB, Bedoor S, Bertone PF, Deibel CM, DiGiovine B, Esbensen H, Greene JP, Hoffman CR, Jiang CL, Lighthall JC, Marley ST, Pardo RC, Paul M, Rogers AM, Ugalde C, Wuosmaa AH. Fusion reactions with the one-neutron halo nucleus (15)C. Phys Rev Lett 2011; 106:172701. [PMID: 21635032 DOI: 10.1103/physrevlett.106.172701] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2011] [Indexed: 05/30/2023]
Abstract
The structure of (15)C, with an s(1/2) neutron weakly bound to a closed-neutron shell nucleus (14)C, makes it a prime candidate for a one-neutron halo nucleus. We have for the first time studied the cross section for the fusion-fission reaction (15)C+(232)Th at energies in the vicinity of the Coulomb barrier and compared it to the yield of the neighboring (14)C+(232)Th system measured in the same experiment. At sub-barrier energies, an enhancement of the fusion yield by factors of 2-5 was observed for (15)C, while the cross sections for (14)C match the trends measured for (12,13)C.
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Affiliation(s)
- M Alcorta
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
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19
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Alcorta M, Rehm KE, Back BB, Bedoor S, Bertone PF, Deibel CM, DiGiovine B, Esbensen H, Greene JP, Hoffman CR, Jiang CL, Lighthall JC, Marley ST, Pardo RC, Paul M, Rogers AM, Ugalde C, Wuosmaa AH. Fusion reactions with the one-neutron halo nucleus 15C. EPJ Web of Conferences 2011. [DOI: 10.1051/epjconf/20111713003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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20
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Wuosmaa AH, Back BB, Baker S, Brown BA, Deibel CM, Fallon P, Hoffman CR, Kay BP, Lee HY, Lighthall JC, Macchiavelli AO, Marley ST, Pardo RC, Rehm KE, Schiffer JP, Shetty DV, Wiedeking M. ¹⁵C(d,p)¹⁶C reaction and exotic behavior in ¹⁶C. Phys Rev Lett 2010; 105:132501. [PMID: 21230766 DOI: 10.1103/physrevlett.105.132501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2010] [Indexed: 05/30/2023]
Abstract
We have studied the ¹⁵C(d,p)¹⁶C reaction in inverse kinematics using the Helical Orbit Spectrometer at Argonne National Laboratory. Prior studies of electromagnetic-transition rates in ¹⁶C suggested an exotic decoupling of the valence neutrons from the core in that nucleus. Neutron-adding spectroscopic factors give a different probe of the wave functions of the relevant states in ¹⁶C. Shell-model calculations reproduce both the present transfer data and the previously measured transition rates, suggesting that ¹⁶C may be described without invoking very exotic phenomena.
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Affiliation(s)
- A H Wuosmaa
- Department of Physics, Western Michigan University, Kalamazoo, Michigan 49008-5252, USA
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21
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Back BB, Baker SI, Brown BA, Deibel CM, Freeman SJ, DiGiovine BJ, Hoffman CR, Kay BP, Lee HY, Lighthall JC, Marley ST, Pardo RC, Rehm KE, Schiffer JP, Shetty DV, Vann AW, Winkelbauer J, Wuosmaa AH. First experiment with HELIOS: the structure of 13B. Phys Rev Lett 2010; 104:132501. [PMID: 20481878 DOI: 10.1103/physrevlett.104.132501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2010] [Indexed: 05/29/2023]
Abstract
A first experiment is reported that makes use of a new kind of spectrometer uniquely suited to the study of reactions with radioactive beams in inverse kinematics, the helical orbit spectrometer, HELIOS. The properties of some low-lying states in the neutron-rich N=8 nucleus 13B were studied with good resolution. From the measured angular distributions of the (d,p) reaction and the relative spectroscopic factors, spin and configuration assignments of the first- and third-excited states of this nucleus can be constrained.
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Affiliation(s)
- B B Back
- Argonne National Laboratory, Argonne, Illinois 60439, USA
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22
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Schiffer JP, Freeman SJ, Clark JA, Deibel C, Fitzpatrick CR, Gros S, Heinz A, Hirata D, Jiang CL, Kay BP, Parikh A, Parker PD, Rehm KE, Villari ACC, Werner V, Wrede C. Nuclear structure relevant to neutrinoless double beta decay: 76Ge and 76Se. Phys Rev Lett 2008; 100:112501. [PMID: 18517778 DOI: 10.1103/physrevlett.100.112501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2007] [Indexed: 05/26/2023]
Abstract
The possibility of observing neutrinoless double beta decay offers the opportunity of determining the effective neutrino mass if the nuclear matrix element were known. Theoretical calculations are uncertain, and measurements of the occupations of valence orbits by nucleons active in the decay can be important. The occupation of valence neutron orbits in the ground states of 76Ge (a candidate for such decay) and 76Se (the daughter nucleus) were determined by precisely measuring cross sections for both neutron-adding and removing transfer reactions. Our results indicate that the Fermi surface is much more diffuse than in theoretical calculations. We find that the populations of at least three orbits change significantly between these two ground states while in the calculations, the changes are confined primarily to one orbit.
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Affiliation(s)
- J P Schiffer
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA.
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23
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Jubel A, Fischer J, Andermahr J, Isenberg J, Schiffer G, Stoddart M, Rehm KE, Häuselmann HJ. [Implantation of matrix-free cartilage transplants in standardized defects in sheep knee joints]. Orthopade 2007; 35:1246-57. [PMID: 17111166 DOI: 10.1007/s00132-006-1021-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
The goal of the current investigation was to make a comparative analysis of regenerative tissue after autologous de novo cartilage transplantation on the femoral condyles of sheep after a chondral defect. One chondral defect measuring 4 mm in diameter was placed in the center of one medial femoral condyle of each of 48 Suffolk sheep. Twelve defects were left to heal spontaneously, 16 defects were covered with periosteal flaps, and 20 defects were filled with autologous de novo cartilage graft. Macroscopic and microscopic assessments were performed at 26 and at 52 weeks. Regeneration was significantly better (p<0.05) in the transplant group than in the control groups at both 26 weeks and 52 weeks. The differences were most evident in the grade of defect filling, cartilage stability, cell distribution, and matrix assessments. Transplantation of immature, autologous de novo cartilage leads to qualitatively better regeneration both macro- and microscopically than does periosteal flap placement alone. The transplanted, immature cartilage tissue undergoes maturation in vivo. The regenerated tissue has hyaline-like features.
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Affiliation(s)
- A Jubel
- Klinik für Unfall-, Hand- und Wiederherstellungschirurgie, Universität Köln, Josef-Stelzmann-Str. 9, 50924 Köln, Deutschland.
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24
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Abstract
Insertion of titanium nails for type A and B clavicular fractures can fail intraoperatively due to the small diameter or irregular nature of the medullary canal. At present, such failures lead to open reduction and fixation (ORIF) with plates. In type C fractures (comminuted fractures), a telescoping effect is observed so that ORIF is the only suitable alternative besides nonoperative therapy. A suitable minimally invasive solution for type C fractures and as a salvage procedure for failed intramedullary nailing of type A and B fractures is presented here for the first time with a percutaneous application of an LC plate to the clavicle.
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Affiliation(s)
- J Andermahr
- Klinik und Poliklinik für Unfall-, Hand- und Wiederherstellungschirurgie, Klinikum der Universität zu Köln, Joseph-Stelzmann-Strasse 9, 50931, Köln.
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25
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Tang XD, Rehm KE, Ahmad I, Brune CR, Champagne A, Greene JP, Hecht AA, Henderson D, Janssens RVF, Jiang CL, Jisonna L, Kahl D, Moore EF, Notani M, Pardo RC, Patel N, Paul M, Savard G, Schiffer JP, Segel RE, Sinha S, Shumard B, Wuosmaa AH. New determination of the astrophysical S factor SE1 of the 12C(alpha,gamma)16O reaction. Phys Rev Lett 2007; 99:052502. [PMID: 17930748 DOI: 10.1103/physrevlett.99.052502] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2007] [Indexed: 05/25/2023]
Abstract
A new measurement of the beta-delayed alpha decay of 16N has been performed using a set of high efficiency ionization chambers. Sources were made by implantation of a 16N beam, yielding very clean alpha spectra down to energies as low as 400 keV. Our data are in good agreement with earlier results. For the S factor S(E1), we obtain a value of 74 +/- 21 keV b. In spite of improvements in the measurement, the error in S(E1) remains relatively large because of the correlations among the fit parameters and the uncertainties inherent to the extrapolation.
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Affiliation(s)
- X D Tang
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
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26
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Kinoshita N, Hashimoto T, Nakanishi T, Yokoyama A, Amakawa H, Mitsugashira T, Ohtsuki T, Takahashi N, Ahmad I, Greene JP, Henderson DJ, Jiang CL, Notani M, Pardo RC, Patel N, Rehm KE, Scott R, Vondrasek R, Jisonna L, Collon P, Robertson D, Schmitt C, Tang XD, Kashiv Y, Paul M. Technological Development for Half-life Measurement of 146Sm Nuclide. ACTA ACUST UNITED AC 2007. [DOI: 10.14494/jnrs2000.8.109] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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27
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Prokop A, Rehm KE, Isenberg J, Hahn U, Schiffer G. [Lecture disasters - and how to prevent them]. Zentralbl Chir 2006; 131:358-61. [PMID: 17004198 DOI: 10.1055/s-2006-933464] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Presentations at medical conferences can sometimes confuse or compromise understanding of current topics. Although considerable time and financial costs may be taken to be present at such events, all too often one must go through inferior presentations that are poorly structured and do not contribute to one's understanding of the topic at hand. A good presentation is distinguishable by the clear intentions of the speaker to give a good lecture. The presenter has worked extensively with his topic and is familiar with the audience. The presentation has a clear structure and finishes with a take-home message. The speaker takes the listener from his previous level of knowledge to a new understanding. To do so, both voice and body language are used. The supporting slides are simple and direct, and not overloaded with information. The speech conforms exactly with the pre-determined time limit.
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Affiliation(s)
- A Prokop
- Fachhochschule Bonn-Rhein-Sieg, Unfallmedizin und Sozialversicherung, Hennef.
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28
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29
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Abstract
BACKGROUND In severely injured patients, diagnostic procedures should be as brief as possible. With the use of spiral CT technology, the time required for diagnosis is minimized. QUESTION Do severely injured patients benefit when primary diagnostic examinations are completed in less than 30 min? How much time is required for primary emergency department (ED) care and how much in the CT scanner? MATERIAL AND METHODS Between 31 July 2001 and 31 December 2003, severely injured patients with ISS scores over 16 underwent total body spiral CT scans (Siemens Somatom Volume Zoom Multislice CT) after initial ultrasonography. One hundred patients (M:F=25:75) with an average age of 42 years (range: 3-81 years) were evaluated retrospectively. The average ISS score was 32.8+/-12 points (range: 17-75 points). RESULTS The average time in the ED, prior to CT, was 33+/-14 min. The CT scans lasted 16+/-5 min and the total diagnostic time was 48+/-14 min. Fifty percent of patients were taken immediately to the operating room. The mortality rate in hospital was 13%. The average hospital stay was 30 days, with an average ICU stay of 10 days. CONCLUSION The shorter the time spent in the ED, the shorter the stays in ICU and in total hospitalization were, regardless of injury severity. With structured management and shortening of diagnostic time with spiral CT, the time in the ED was decreased from 85 to 48 min.
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Affiliation(s)
- A Prokop
- Fachbereich Unfallmedizin und Sozialversicherung, Fachhochschule Bonn-Rhein-Sieg, Hennef.
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30
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Nassar H, Paul M, Ahmad I, Ben-Dov Y, Caggiano J, Ghelberg S, Goriely S, Greene JP, Hass M, Heger A, Heinz A, Henderson DJ, Janssens RVF, Jiang CL, Kashiv Y, Nara Singh BS, Ofan A, Pardo RC, Pennington T, Rehm KE, Savard G, Scott R, Vondrasek R. 40Ca(alpha, gamma)44Ti reaction in the energy regime of supernova nucleosynthesis. Phys Rev Lett 2006; 96:041102. [PMID: 16486801 DOI: 10.1103/physrevlett.96.041102] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2005] [Indexed: 05/06/2023]
Abstract
The 44Ti(t1/2=59 yr) nuclide, an important signature of supernova nucleosynthesis, has recently been observed as live radioactivity by gamma-ray astronomy from the Cas A remnant. We investigate in the laboratory the major 44Ti production reaction 40Ca(alpha, gamma)44Ti (Ec.m. approximately 0.6-1.2 MeV/u by direct off-line counting of 44Ti nuclei. The yield, significantly higher than inferred from previous experiments, is analyzed in terms of a statistical model using microscopic nuclear inputs. The associated stellar rate has important astrophysical consequences, increasing the calculated supernova 44Ti yield by a factor approximately 2 over previous estimates and bringing it closer to Cas A observations.
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Affiliation(s)
- H Nassar
- Racah Institute of Physics, Hebrew University, 91904 Jerusalem, Israel
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31
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Abstract
OBJECTIVES The aim of this prospective study was to compare the results achieved in two groups of patients treated for mid-clavicular fracture. METHODS The first group of 27 patients was treated nonoperatively with a rucksack bandage, whereas the second group underwent intramedullary fixation with a titanium pin, using a minimally invasive technique. Within the follow-up period of 6 months, results were evaluated seven times. RESULTS During the whole period significantly (p<0.05) better results were observed in the group of operated patients concerning shoulder function, Constant score, DASH score, personal satisfaction, pain, and cosmetic result. In the second group return to work occurred in less than half the time of the first group. CONCLUSION Intramedullary nailing of mid-clavicular fractures is a safe and minimally invasive operation technique. Early functional and cosmetic results are not worse than results after nonoperative treatment with a rucksack bandage.
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Affiliation(s)
- A Jubel
- Klinik für Unfall-, Hand- und Wiederherstellungschirurgie, Universität Köln.
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32
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Abstract
This prospective clinical trial was performed to assess healing, clinical outcome and complications after intramedullary nailing of midshaft clavicular nonunions. Over 2.5 years, 14 patients were included. Exclusion criteria were pathological fractures, bony defects, previous operative therapy, atrophic and infection pseudarthrosis and the patient's age: <18 years or >70 years. Results were evaluated after 3, 6, 12 and 18 months. Beginning 3 months after the operation, pain (VAS), subjective satisfaction, Constant score and DASH score were significantly better than preoperatively during the follow-up period (p<0.001). There were no infections, no implant displacements or refractures.Intramedullary fixation of midshaft clavicular nonunions with an elastic titanium nail is a safe, minimally invasive surgical technique, producing excellent functional and cosmetic results without additional bone grafting.
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Affiliation(s)
- A Jubel
- Klinik für Unfall-, Hand- und Wiederherstellungschirurgie der Universität zu Köln.
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33
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Nassar H, Paul M, Ahmad I, Berkovits D, Bettan M, Collon P, Dababneh S, Ghelberg S, Greene JP, Heger A, Heil M, Henderson DJ, Jiang CL, Käppeler F, Koivisto H, O'Brien S, Pardo RC, Patronis N, Pennington T, Plag R, Rehm KE, Reifarth R, Scott R, Sinha S, Tang X, Vondrasek R. Stellar (n,gamma) cross section of 62Ni. Phys Rev Lett 2005; 94:092504. [PMID: 15783960 DOI: 10.1103/physrevlett.94.092504] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2004] [Revised: 12/15/2004] [Indexed: 05/24/2023]
Abstract
The 62Ni(n,gamma)63Ni(t(1/2)=100+/-2 yr) reaction plays an important role in the control of the flow path of the slow neutron-capture (s) nucleosynthesis process. We have measured for the first time the total cross section of this reaction for a quasi-Maxwellian (kT=25 keV) neutron flux. The measurement was performed by fast-neutron activation, combined with accelerator mass spectrometry to detect directly the 63Ni product nuclei. The experimental value of 28.4+/-2.8 mb, fairly consistent with a recent calculation, affects the calculated net yield of 62Ni itself and the whole distribution of nuclei with 62<A<90 produced by the weak s process in massive stars.
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Affiliation(s)
- H Nassar
- Racah Institute of Physics, Hebrew University, Jerusalem, Israel, 91904
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34
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Wuosmaa AH, Rehm KE, Greene JP, Henderson DJ, Janssens RVF, Jiang CL, Jisonna L, Moore EF, Pardo RC, Paul M, Peterson D, Pieper SC, Savard G, Schiffer JP, Segel RE, Sinha S, Tang X, Wiringa RB. Neutron spectroscopic factors in 9Li from 2H(8Li,p)9Li. Phys Rev Lett 2005; 94:082502. [PMID: 15783884 DOI: 10.1103/physrevlett.94.082502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2004] [Indexed: 05/24/2023]
Abstract
We have studied the 2H(8Li,p)9Li reaction to obtain information on the spins, parities, and single-neutron spectroscopic factors for states in 9Li, using a radioactive 8Li beam. The deduced properties of the lowest three states are compared to the predictions of a number of calculations for the structure of 9Li. The results of ab initio quantum Monte Carlo calculations are in good agreement with the observed properties.
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Affiliation(s)
- A H Wuosmaa
- Physics Department, Western Michigan University, Kalamazoo, MI 49008-5252, USA
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35
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Jubel A, Andermahr J, Isenberg J, Schiffer G, Prokop A, Rehm KE. [Experience with elastic stable intramedullary nailing (ESIN) of shaft fractures in children]. Orthopade 2004; 33:928-35. [PMID: 15156310 DOI: 10.1007/s00132-004-0662-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The aim of this prospective clinical controlled trial was to investigate the early and midterm results of shaft fractures in children treated with elastic stable intramedullary nailing (ESIN). From January 1997 to December 2001, elastic stable intramedullary nailing was carried out on 112 children with 118 diaphyseal fractures. The mean age was 7.7 years. There were 51 fractures of the lower arm, 46 femoral fractures, 14 of the lower leg, and 7 of the humerus. A total of 92 children have been followed up for more than 12 months. The mean time of follow-up was 38 months.The mean time of fluoroscopy was 2.2 min. Open reduction was necessary in 3.4 %. In children with injuries of the lower extremity, full weight bearing was achieved after a mean period of 9.3 days. In 1.8% of the children, reoperation was necessary within the first 10 days after the operation. In 3.6 % there was painful skin irritation due to the protruding end of a nail. No infection or delayed union was observed. Implant removal was done after a mean time of 5.6 months. There was no rotational or angular deformity of more than 5 degrees in children with isolated fractures of the lower extremity. Mean lengthening of the injured leg was 2.4 mm. In three children who had fractures of the upper extremity, a deficit in range of motion of the adjacent joints was detected. The current results show that intramedullary fixation of displaced diaphyseal fractures in children with a flexible titanium nail is a safe, minimally invasive surgical technique producing excellent functional and cosmetic results.
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Affiliation(s)
- A Jubel
- Klinik für Unfall-, Hand- und Wiederherstellungschirurgie der Universität zu Köln.
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36
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Wang LB, Mueller P, Bailey K, Drake GWF, Greene JP, Henderson D, Holt RJ, Janssens RVF, Jiang CL, Lu ZT, O'Connor TP, Pardo RC, Rehm KE, Schiffer JP, Tang XD. Laser spectroscopic determination of the 6He nuclear charge radius. Phys Rev Lett 2004; 93:142501. [PMID: 15524784 DOI: 10.1103/physrevlett.93.142501] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2004] [Indexed: 05/24/2023]
Abstract
We have performed precision laser spectroscopy on individual 6He (t(1/2)=0.8 s) atoms confined and cooled in a magneto-optical trap, and measured the isotope shift between 6He and 4He to be 43 194.772+/-0.056 MHz for the 2(3)S1-3(3)P2 transition. Based on this measurement and atomic theory, the nuclear charge radius of 6He is determined for the first time in a method independent of nuclear models to be 2.054+/-0.014 fm. The result is compared with the values predicted by a number of nuclear structure calculations and tests their ability to characterize this loosely bound halo nucleus.
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Affiliation(s)
- L-B Wang
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
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37
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Jubel A, Andermahr J, Prokop A, Bergmann H, Isenberg J, Rehm KE. Pitfalls und Komplikationen der elastisch stabilen intramedull�ren Nagelung (ESIN) von Femurfrakturen im Kindesalter. Unfallchirurg 2004; 107:744-9. [PMID: 15235779 DOI: 10.1007/s00113-004-0799-6] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND The aim of this prospective study was to evaluate the intra- and postoperative problems as well as the complications of elastic stable intramedullary nailing (ESIN) of femur fractures in children. PATIENTS AND METHODS 47 consecutive children, mean age 6 years, were reviewed clinically and radiologically until hardware removal and after this annually. Mean time of follow up was 37 months. RESULTS Intraoperatively one cortex perforation and one displacement of a third fragment occurred. Two correction operations were necessary: In one case due to an implant displacement and in another case due to an unacceptable loss of reduction. There were no infections, non union, implant breakage, refracture or disturbance of growth. CONCLUSIONS ESIN is a safe procedure in femoral shaft fractures of children. Most of the problems and complications can be avoided by a careful consideration of the indication and a correct operation technique.
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Affiliation(s)
- A Jubel
- Klinik für Unfall-, Hand- und Wiederherstellungschirurgie, Universität zu Köln.
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38
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Jubel A, Andermahr J, Mairhofer J, Prokop A, Hahn U, Rehm KE. Die Anwendung des injizierbaren Knochenzements Norian�SRS bei Tibiakopffrakturen. Orthop�de 2004; 33:919-27. [PMID: 15138676 DOI: 10.1007/s00132-004-0664-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Reduction of the depressed joint surface in tibial plateau fractures often leaves large cancellous bone defects. These metaphyseal voids are typically filled with autogenous bone grafts that can cause a significant donor site morbidity. The use of injectable bone cement offers the opportunity to support the reduced joint surface without bone grafting. The aim of this study was to evaluate the clinical and radiological outcome as well as the period of partial weight bearing after the use of Norian SRS in tibial plateau fractures. Twenty-one patients with a mean age of 48 years were included in this prospective trial. According to the AO/OTA Classification, there were seven fractures of type B2, ten B3, one C1, one C2, and two fractures of type C3. The period of partial weight bearing was 3.7 weeks. In 18 patients the follow-up was more than 24 months. After a mean follow-up of 30 months, the Lysholm score was 87.9 at mean. The radiological part of the Rasmussen score was excellent and good in eight cases each and fair in four cases. Soft tissue reactions due to the cement were not observed. On all radiographs taken 36 months after the operation the cement bloc was still visible. The results show that Norian SRS can be used to fill metaphyseal bone defects in tibial plateau fractures. Clinical and radiological results are comparable to those of fractures treated with autologous bone graft. The high compression strength allows early full weight bearing without the risk of secondary loss of reduction.
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Affiliation(s)
- A Jubel
- Klinik für Unfall-, Hand- und Wiederherstellungschirurgie der Universität zu Köln.
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39
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Jubel A, Andermahr J, Isenberg J, Bergmann H, Prokop A, Rehm KE. Die elastisch stabile intramedulläre Nagelung (ESIN) instabiler kindlicher Unterarmfrakturen. ACTA ACUST UNITED AC 2004. [DOI: 10.1055/s-2004-820922] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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40
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Schiffer JP, Freeman SJ, Caggiano JA, Deibel C, Heinz A, Jiang CL, Lewis R, Parikh A, Parker PD, Rehm KE, Sinha S, Thomas JS. Is the nuclear spin-orbit interaction changing with neutron excess? Phys Rev Lett 2004; 92:162501. [PMID: 15169222 DOI: 10.1103/physrevlett.92.162501] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2003] [Indexed: 05/24/2023]
Abstract
The difference in the energies of the lowest states corresponding to the two nodeless single-particle orbitals outside the Z=50 closed proton shell, h(11/2) and g(7/2), increases with neutron excess. We have measured the Sn(alpha,t) reaction for all seven stable even Sn isotopes and found that the spectroscopic factors are constant for these two states, confirming their characterization as single-particle states. The trend in energies is consistent with a decrease in the nuclear spin-orbit interaction. A similar trend, also suggesting a decreasing spin-orbit splitting, is seen in the energies of the neutron single-particle states outside the N=82 core, i(13/2) and h(9/2).
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Affiliation(s)
- J P Schiffer
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
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41
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Jubel A, Andemahr J, Bergmann H, Prokop A, Rehm KE. Elastic stable intramedullary nailing of midclavicular fractures in athletes. Br J Sports Med 2004; 37:480-3; discussion 484. [PMID: 14665582 PMCID: PMC1724711 DOI: 10.1136/bjsm.37.6.480] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
BACKGROUND Intramedullary fixation of midclavicular fractures may be a better option than non-operative treatment for high performance/professional athletes because of the potential reduction in recovery time. OBJECTIVES To evaluate the effectiveness of intramedullary fixation in high performance athletes and the time required to return to sporting activity. METHODS Data were taken from a prospective study on intramedullary fixation techniques using the elastic stable Ti nail (TEN, Synthes) for the treatment of displaced midclavicular fractures, initiated in 1996. The patients in 12 cases were classified as high performance/professional athletes. These cases were used to evaluate the technique specifically in this population. Fractures were classified according to the Orthopaedic Trauma Association (OTA) system. Patients were evaluated before and after surgery for shoulder function and subjective pain. After the operation, radiological assessments documented fracture healing, and clinical outcomes scores were obtained. Time required to return to training and competition was documented. RESULTS All fractures were transverse or oblique. Mean (SD) shoulder abduction increased from 36.3 (8) degrees before surgery to 154.2 (17) degrees afterwards (p<0.001). Mean subjective pain score using a visual analogue scale (0-100) decreased from 71.7 (18) points before surgery to 19.2 (6) points (p<0.001) three days after. There were no complications. Hospital stay averaged 2.9 (1) days. Mean delay to resumption of training was 5.9 (1) days, and to resumption of competition it was 16.8 (5) days. The mean Constant clinical outcomes score one year after hardware removal was 98.3 (2) points. CONCLUSIONS Intramedullary fixation of displaced midclavicular fracture was successful in terms of clinical outcome and rapid resumption of sporting activities. This treatment should be offered to athletes as an alternative to non-operative treatment.
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Affiliation(s)
- A Jubel
- University Hospital of Cologne, Cologne, Germany.
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42
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Jenkins DG, Lister CJ, Janssens RVF, Khoo TL, Moore EF, Rehm KE, Truett B, Wuosmaa AH, Freer M, Fulton BR, José J. Reevaluation of the 22Na(p,gamma) reaction rate: implications for the detection of 22Na gamma rays from novae. Phys Rev Lett 2004; 92:031101. [PMID: 14753860 DOI: 10.1103/physrevlett.92.031101] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2003] [Revised: 11/24/2003] [Indexed: 05/24/2023]
Abstract
Understanding the processes which create and destroy 22Na is important for diagnosing classical nova outbursts. Conventional 22Na(p,gamma) studies are complicated by the need to employ radioactive targets. In contrast, we have formed the particle-unbound states of interest through the heavy-ion fusion reaction, 12C(12C,n)23Mg and used the Gammasphere array to investigate their radiative decay branches. Detailed spectroscopy was possible and the 22Na(p,gamma) reaction rate has been reevaluated. New hydrodynamical calculations incorporating the upper and lower limits on the new rate suggest a reduction in the yield of 22Na with respect to previous estimates, implying a reduction in the maximum detectability distance for 22Na gamma rays from novae.
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Affiliation(s)
- D G Jenkins
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
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43
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Abstract
Soft tissue reactions resulting from biodegradable polylactide implants to bone have not been adequately examined during their 3-year degradation period. An osteotomy was performed on the medial femoral condyle of 36 sheep and secured by either three poly-L-DL-lactide pins (70/30) (Polypin) or three composite pins [10% beta-tricalcium phosphate (beta-TCP) (90/10)]. A histological examination was performed on the synovial membrane and lymph nodes after 3, 18 and 36 months. After 18 months two non-specific, minor reactions of the synovial membrane were observed in the composite pin group. In both groups different reactions of both inguinal lymph nodes were observed. These had no statistical relevance and could not be clearly attributed to the implants. Due to the slow degradation process of biodegradable polylactide implants, there is no clinically relevant inflammation of either joint or lymph nodes. The addition of 10% beta-TCP did not result in any significant enhancement.
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Affiliation(s)
- A Prokop
- Department of Trauma and Reconstructive Surgery, University Hospital, Cologne, Joseph-Stelzmann-Strasse 9, D-50924 Cologne, Germany.
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44
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Winter WT, Freedman SJ, Rehm KE, Ahmad I, Greene JP, Heinz A, Henderson D, Janssens RVF, Jiang CL, Moore EF, Mukherjee G, Pardo RC, Pennington T, Savard G, Schiffer JP, Seweryniak D, Zinkann G, Paul M. Determination of the 8B neutrino spectrum. Phys Rev Lett 2003; 91:252501. [PMID: 14754108 DOI: 10.1103/physrevlett.91.252501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2003] [Revised: 09/22/2003] [Indexed: 05/24/2023]
Abstract
We have measured the total energy of the alpha particles following the beta decay of 8B by implanting 8B into a planar silicon surface barrier detector. Calibration was performed using alpha particles following the beta decay of 20Na, similarly implanted. The alpha spectrum is used to infer the 8B neutrino spectrum which is an important input in the interpretation of experiments that detect energetic neutrinos from the Sun. The alpha spectrum reported here is in disagreement with the previous best measurement which used two detectors in coincidence.
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Affiliation(s)
- W T Winter
- Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
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45
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Jubel A, Andermahr J, Prokop A, Isenberg J, Rehm KE. [Minimal invasive biological osteosynthesis of the clavicle with a titanium nail]. Kongressbd Dtsch Ges Chir Kongr 2003; 119:485-90. [PMID: 12704900] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 03/02/2023]
Abstract
Until December 2001 84 midclavicular fractures in 80 patients were treated with intramedullary nailing. Postoperatively there was a significant decrease of pain and a significant increase of mobility compared to the situation preoperatively. 6 months after hardware removal the mean Constant-Score was 97.4 points. There was one none union. In one patient there was a loss of reduction with shortening of 1.5 cm. In 5 patients a shortening of the proximal end of the nail had to be performed, due to painful skin irritation. Intramedullary nailing of midclavicular fractures is a safe and minimally invasive operation technique. It should be offered to the patient as an alternative to conservative treatment.
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Affiliation(s)
- A Jubel
- Klinik für Unfall-, Hand- und Wiederherstellungschirurgie, Klinikum der Universität zu Köln, Joseph-Stelzmann-Strasse 9, 50924 Köln.
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46
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Prokop A, Jubel A, Hahn U, Rehm KE. [Intramedullary fixation of pediatric bone shaft fractures]. Kongressbd Dtsch Ges Chir Kongr 2003; 119:526-31. [PMID: 12704906] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 03/02/2023]
Abstract
Intramedullary stabilisation (Prévot-nailing) of shaft fractures in childhood allows full weight bearing without cast. Early fracture healing is seen by respecting soft tissue around fracture and by using distal or proximal approaches. Good indications of femoral shaft osteosynthesis are recommended in oblique- and transverse-fractures. Intramedullary stabilization seems to be a good alternative methode instead of casting calf-shaft-fractures. An instable fracture of forearm may be treated intramedullary to avoid often observed displacement ad axim and rotation. Humoral fractures primary have to be treated conservatively. Only in displaced fractures or in cases with additional injuries an intramedullary procedure with free range of motion is recommended.
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Affiliation(s)
- A Prokop
- Unfall-, Hand- und Wiederherstellungschirurgie, Klinikum der Universität zu Köln, 50924 Köln.
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47
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Hahn U, Prokop A, Jubel A, Isenberg J, Rehm KE. [LISS versus condylar plate]. Kongressbd Dtsch Ges Chir Kongr 2003; 119:498-504. [PMID: 12704902] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 03/02/2023]
Abstract
Up to the seventies the surgical treatment of supra- and bicondylar femoral fractures was difficult and showed a lot of complications. In most studies a conservative treatment was recommended. In the least 30 years the clinical outcome after surgical treatment improved. This was a result of the development of new implants and improved surgical techniques. However, today the primary surgical treatment is the therapy of choice. We reviewed from 1986 to 2001 n = 121 distal femoral fractures which were in 32 cases treated with a Condylar Blade Plate and in 10 cases with a less invasive stabilisation system (LISS). The final results after condylar blade plating were rated using the system that was described by Neer. The averaged follow up time was 9 years. Low postoperative infection rates and in 75% excellent and satisfactory results combined with low cost are the reference for the evaluation of the LISS results. While in our owen series according to the literature there were no significant better functional results for the LISS group than for the Condylar Blade Plate group there were only few autologous bone grafts necessary. Due to the angle-stable self-drilling and self-cutting screws and the Internal-Fixater Principle the LISS has some mechanical and biological edge on the condylar blade plate.
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Affiliation(s)
- U Hahn
- Klinik und Poliklinik für Unfall-, Hand- und Wiederherstellungschirurgie, Klinikum der Universität zu Köln, Joseph-Stelzmann-Strasse 9, 50924 Köln.
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48
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Prokop A, Helling HJ, Kulus S, Rehm KE. [Conservative treatment of metacarpal fracture]. Kongressbd Dtsch Ges Chir Kongr 2003; 119:532-5. [PMID: 12704907] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 03/02/2023]
Abstract
Conservative treatment of meatacarpale fracture is recommended if there are no joint displacement, rotation failures, displacement over 30 degrees ad axim and shortening over 5 mm. Operative procedures should be done in open fractures and serial of fractures of metacarpale bones. Early functionally treatment should be done in stable, not displaced fractures. Cast can be used only for a short time in full extended position of fingers and flexion in metacarpo-phalangeal joint in 60-90 degrees. Twin-tapes after reduction of edema allowed free range of motion by fixed rotation. Closed reduction of displaced fractures of fifth metacarpal bone (boxer's fracture) isn't successful. Cases with displacement over 30 degrees may be operatively treated by intramedullary stabilization.
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Affiliation(s)
- A Prokop
- Unfall-, Hand- und Wiederherstellungschirurgie, Klinikum der Universität zu Köln, 50924 Köln.
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49
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Prokop A, Jubel A, Hahn U, Rehm KE. [Stabilizing intramedullary pediatric shaft fractures]. Kongressbd Dtsch Ges Chir Kongr 2003; 119:689-94. [PMID: 12704917] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 03/02/2023]
Abstract
Intramedullary stabilisation (Prévot-nailing) of shaft fractures in childhood allows full weight bearing without cast. Early fracture healing is seen by respecting soft tissue around fracture and by using distal or proximal approaches. Good indications of femoral shaft osteosynthesis are recommended in oblique and transverse fractures. Intramedullary stabilization seems to be a good alternative method instead of casting calf-shaft fractures. An unstable fracture of forearm may be treated intramedullary to avoid often observed displacement ad axim and rotation. Humoral fractures primary have to be treated conservatively. Only in displaced fractures or in cases with additional injuries an intramedullary procedure with free range of motion is recommended.
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Affiliation(s)
- A Prokop
- Klinik für Unfall-, Hand- und Wiederherstellungschirurgie, Klinikum der Universität zu Köln, Joseph-Stelzmann-Strasse 9, 50924 Köln.
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50
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Prokop A, Helling HJ, Andermahr J, Mönig S, Rehm KE. [Tossy III injuries of the acromioclavicular joint. In what circumstances is surgery still justified? Personal results and literature review]. Orthopade 2003; 32:432-6. [PMID: 12743695 DOI: 10.1007/s00132-002-0419-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In Germany AC-joint-dislocations type Tossy III are treated in most of the cases operatively. Over two times of period we treated AC-joint-dislocations type Tossy III with biodegradable PDS-cords. 54 patients were operated between 1989 and 1997 and followed up after 39 months. 87.5% of patients are satisfied with results and have 10.2 points at Taftscore. In this period we couldn't differentiated the results by Rockwood classification. 12 patients with Rockwood V were operated between 1998 and 2002 and followed up after 14 months. Excellent and good results were seen in 92% of cases. At Taftscore we seen 10.7 points. 3 patients with Rockwood III were treated conservative with 10.3 points and 3 patients were operated with 10.7 points at Taftscore. AC-joint dislocations should be classified to Rockwood. No differences were seen between operation and conservative treatment in Rockwood III in literature. We recommend operation with PDS cords with good results in Rockwood V.
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Affiliation(s)
- A Prokop
- Klinik und Poliklinik für Unfall, Hand- und Wiederherstellungschirurgie, Klinikum der Universität, Cologne.
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