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Meisel Z, George S, Ahn S, Bazin D, Brown BA, Browne J, Carpino JF, Chung H, Cole AL, Cyburt RH, Estradé A, Famiano M, Gade A, Langer C, Matoš M, Mittig W, Montes F, Morrissey DJ, Pereira J, Schatz H, Schatz J, Scott M, Shapira D, Smith K, Stevens J, Tan W, Tarasov O, Towers S, Wimmer K, Winkelbauer JR, Yurkon J, Zegers RGT. Mass Measurement of 56Sc Reveals a Small A = 56 Odd-Even Mass Staggering, Implying a Cooler Accreted Neutron Star Crust. Phys Rev Lett 2015; 115:162501. [PMID: 26550869 DOI: 10.1103/physrevlett.115.162501] [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: 05/31/2015] [Indexed: 06/05/2023]
Abstract
We present the mass excesses of (52-57)Sc, obtained from recent time-of-flight nuclear mass measurements at the National Superconducting Cyclotron Laboratory at Michigan State University. The masses of 56Sc and 57Sc were determined for the first time with atomic mass excesses of -24.85(59)((-54)(+0)) MeV and -21.0(1.3) MeV, respectively, where the asymmetric uncertainty for 56Sc was included due to possible contamination from a long-lived isomer. The 56Sc mass indicates a small odd-even mass staggering in the A = 56 mass chain towards the neutron drip line, significantly deviating from trends predicted by the global FRDM mass model and favoring trends predicted by the UNEDF0 and UNEDF1 density functional calculations. Together with new shell-model calculations of the electron-capture strength function of 56Sc, our results strongly reduce uncertainties in model calculations of the heating and cooling at the 56Ti electron-capture layer in the outer crust of accreting neutron stars. We find that, in contrast to previous studies, neither strong neutrino cooling nor strong heating occurs in this layer. We conclude that Urca cooling in the outer crusts of accreting neutron stars that exhibit superbursts or high temperature steady-state burning, which are predicted to be rich in A≈56 nuclei, is considerably weaker than predicted. Urca cooling must instead be dominated by electron capture on the small amounts of adjacent odd-A nuclei contained in the superburst and high temperature steady-state burning ashes. This may explain the absence of strong crust Urca cooling inferred from the observed cooling light curve of the transiently accreting x-ray source MAXI J0556-332.
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Affiliation(s)
- Z Meisel
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
| | - S George
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - S Ahn
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
| | - D Bazin
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - B A Brown
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - J Browne
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
| | - J F Carpino
- Department of Physics, Western Michigan University, Kalamazoo, Michigan 49008, USA
| | - H Chung
- Department of Physics, Western Michigan University, Kalamazoo, Michigan 49008, USA
| | - A L Cole
- Physics Department, Kalamazoo College, Kalamazoo, Michigan 49006, USA
| | - R H Cyburt
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
| | - A Estradé
- School of Physics and Astronomy, The University of Edinburgh, EH8 9YL Edinburgh, United Kingdom
| | - M Famiano
- Department of Physics, Western Michigan University, Kalamazoo, Michigan 49008, USA
| | - A Gade
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - C Langer
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
| | - M Matoš
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - W Mittig
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - F Montes
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
| | - D J Morrissey
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - J Pereira
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
| | - H Schatz
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
| | - J Schatz
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - M Scott
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - D Shapira
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - K Smith
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - J Stevens
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
| | - W Tan
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - O Tarasov
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - S Towers
- Department of Physics, Western Michigan University, Kalamazoo, Michigan 49008, USA
| | - K Wimmer
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - J R Winkelbauer
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - J Yurkon
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - R G T Zegers
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
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2
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Pain SD, Bardayan DW, Blackmon JC, Brown SM, Chae KY, Chipps KA, Cizewski JA, Jones KL, Kozub RL, Liang JF, Matei C, Matos M, Moazen BH, Nesaraja CD, Okołowicz J, O'Malley PD, Peters WA, Pittman ST, Płoszajczak M, Schmitt KT, Shriner JF, Shapira D, Smith MS, Stracener DW, Wilson GL. Constraint of the astrophysical ^{26g}Al(p,γ)^{27}Si destruction rate at stellar temperatures. Phys Rev Lett 2015; 114:212501. [PMID: 26066430 DOI: 10.1103/physrevlett.114.212501] [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: 10/29/2014] [Indexed: 06/04/2023]
Abstract
The Galactic 1.809-MeV γ-ray signature from the β decay of ^{26g}Al is a dominant target of γ-ray astronomy, of which a significant component is understood to originate from massive stars. The ^{26g}Al(p,γ)^{27}Si reaction is a major destruction pathway for ^{26g}Al at stellar temperatures, but the reaction rate is poorly constrained due to uncertainties in the strengths of low-lying resonances in ^{27}Si. The ^{26g}Al(d,p)^{27}Al reaction has been employed in inverse kinematics to determine the spectroscopic factors, and hence resonance strengths, of proton resonances in ^{27}Si via mirror symmetry. The strength of the 127-keV resonance is found to be a factor of 4 higher than the previously adopted upper limit, and the upper limit for the 68-keV resonance has been reduced by an order of magnitude, considerably constraining the ^{26g}Al destruction rate at stellar temperatures.
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Affiliation(s)
- S D Pain
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - D W Bardayan
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - J C Blackmon
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - S M Brown
- Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom
| | - K Y Chae
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
- Department of Physics, Sungkyunkwan University, Suwon 440-746, Korea
| | - K A Chipps
- Department of Physics and Astronomy, Rutgers University, New Brunswick, New Jersey 08903, USA
| | - J A Cizewski
- Department of Physics and Astronomy, Rutgers University, New Brunswick, New Jersey 08903, USA
| | - K L Jones
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - R L Kozub
- Department of Physics, Tennessee Technological University, Cookeville, Tennessee 38505, USA
| | - J F Liang
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - C Matei
- Oak Ridge Associated Universities, Building 6008, P.O. Box 2008, Oak Ridge, Tennessee 37831-6374, USA
| | - M Matos
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - B H Moazen
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - C D Nesaraja
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - J Okołowicz
- Institute of Nuclear Physics, Polish Academy of Sciences, Radzikowskiego 152, PL-31342 Kraków, Poland
| | - P D O'Malley
- Department of Physics and Astronomy, Rutgers University, New Brunswick, New Jersey 08903, USA
| | - W A Peters
- Oak Ridge Associated Universities, Building 6008, P.O. Box 2008, Oak Ridge, Tennessee 37831-6374, USA
| | - S T Pittman
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - M Płoszajczak
- Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DSMCNRS/IN2P3, Boîte Postale 55027, F-14076 Caen Cedex, France
| | - K T Schmitt
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - J F Shriner
- Department of Physics, Tennessee Technological University, Cookeville, Tennessee 38505, USA
| | - D Shapira
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - M S Smith
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - D W Stracener
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - G L Wilson
- Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom
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Meisel Z, George S, Ahn S, Browne J, Bazin D, Brown BA, Carpino JF, Chung H, Cyburt RH, Estradé A, Famiano M, Gade A, Langer C, Matoš M, Mittig W, Montes F, Morrissey DJ, Pereira J, Schatz H, Schatz J, Scott M, Shapira D, Smith K, Stevens J, Tan W, Tarasov O, Towers S, Wimmer K, Winkelbauer JR, Yurkon J, Zegers RGT. Mass measurements demonstrate a strong N=28 shell gap in argon. Phys Rev Lett 2015; 114:022501. [PMID: 25635542 DOI: 10.1103/physrevlett.114.022501] [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: 10/27/2014] [Indexed: 06/04/2023]
Abstract
We present results from recent time-of-flight nuclear mass measurements at the National Superconducting Cyclotron Laboratory at Michigan State University. We report the first mass measurements of ^{48}Ar and ^{49}Ar and find atomic mass excesses of -22.28(31) MeV and -17.8(1.1) MeV, respectively. These masses provide strong evidence for the closed shell nature of neutron number N=28 in argon, which is therefore the lowest even-Z element exhibiting the N=28 closed shell. The resulting trend in binding-energy differences, which probes the strength of the N=28 shell, compares favorably with shell-model calculations in the sd-pf shell using SDPF-U and SDPF-MU Hamiltonians.
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Affiliation(s)
- Z Meisel
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA and Department of Physics and Astronomy, Michigan State University, East Lansing, 48824 Michigan, USA and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, 48824 Michigan, USA
| | - S George
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, 48824 Michigan, USA and Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - S Ahn
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, 48824 Michigan, USA
| | - J Browne
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA and Department of Physics and Astronomy, Michigan State University, East Lansing, 48824 Michigan, USA and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, 48824 Michigan, USA
| | - D Bazin
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA
| | - B A Brown
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA and Department of Physics and Astronomy, Michigan State University, East Lansing, 48824 Michigan, USA
| | - J F Carpino
- Department of Physics, Western Michigan University, Kalamazoo, 49008 Michigan, USA
| | - H Chung
- Department of Physics, Western Michigan University, Kalamazoo, 49008 Michigan, USA
| | - R H Cyburt
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, 48824 Michigan, USA
| | - A Estradé
- School of Physics and Astronomy, The University of Edinburgh, EH8 9YL Edinburgh, United Kingdom
| | - M Famiano
- Department of Physics, Western Michigan University, Kalamazoo, 49008 Michigan, USA
| | - A Gade
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA and Department of Physics and Astronomy, Michigan State University, East Lansing, 48824 Michigan, USA
| | - C Langer
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, 48824 Michigan, USA
| | - M Matoš
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, 70803 Louisiana, USA
| | - W Mittig
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA and Department of Physics and Astronomy, Michigan State University, East Lansing, 48824 Michigan, USA
| | - F Montes
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, 48824 Michigan, USA
| | - D J Morrissey
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA and Department of Chemistry, Michigan State University, East Lansing, 48824 Michigan, USA
| | - J Pereira
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, 48824 Michigan, USA
| | - H Schatz
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA and Department of Physics and Astronomy, Michigan State University, East Lansing, 48824 Michigan, USA and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, 48824 Michigan, USA
| | - J Schatz
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA
| | - M Scott
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA and Department of Physics and Astronomy, Michigan State University, East Lansing, 48824 Michigan, USA
| | - D Shapira
- Oak Ridge National Laboratory, Oak Ridge, 37831 Tennessee, USA
| | - K Smith
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, 48824 Michigan, USA and Department of Physics, University of Notre Dame, South Bend, 46556 Indiana, USA
| | - J Stevens
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA and Department of Physics and Astronomy, Michigan State University, East Lansing, 48824 Michigan, USA and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, 48824 Michigan, USA
| | - W Tan
- Department of Physics, University of Notre Dame, South Bend, 46556 Indiana, USA
| | - O Tarasov
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA
| | - S Towers
- Department of Physics, Western Michigan University, Kalamazoo, 49008 Michigan, USA
| | - K Wimmer
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA
| | - J R Winkelbauer
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA and Department of Physics and Astronomy, Michigan State University, East Lansing, 48824 Michigan, USA
| | - J Yurkon
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA
| | - R G T Zegers
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA and Department of Physics and Astronomy, Michigan State University, East Lansing, 48824 Michigan, USA and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, 48824 Michigan, USA
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Allmond JM, Stuchbery AE, Beene JR, Galindo-Uribarri A, Liang JF, Padilla-Rodal E, Radford DC, Varner RL, Ayres A, Batchelder JC, Bey A, Bingham CR, Howard ME, Jones KL, Manning B, Mueller PE, Nesaraja CD, Pain SD, Peters WA, Ratkiewicz A, Schmitt KT, Shapira D, Smith MS, Stone NJ, Stracener DW, Yu CH. Double-magic nature of 132Sn and 208Pb through lifetime and cross-section measurements. Phys Rev Lett 2014; 112:172701. [PMID: 24836240 DOI: 10.1103/physrevlett.112.172701] [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: 02/04/2014] [Indexed: 06/03/2023]
Abstract
Single-neutron states in (133)Sn and (209)Pb, which are analogous to single-electron states outside of closed atomic shells in alkali metals, were populated by the ((9)Be, (8)Be) one-neutron transfer reaction in inverse kinematics using particle-γ coincidence spectroscopy. In addition, the s(1/2) single-neutron hole-state candidate in (131)Sn was populated by ((9)Be, (10)Be). Doubly closed-shell (132)Sn (radioactive) and (208)Pb (stable) beams were used at sub-Coulomb barrier energies of 3 MeV per nucleon. Level energies, γ-ray transitions, absolute cross sections, spectroscopic factors, asymptotic normalization coefficients, and excited-state lifetimes are reported and compared with shell-model expectations. The results include a new transition and precise level energy for the 3p(1/2) candidate in (133)Sn, new absolute cross sections for the 1h(9/2) candidate in (133)Sn and 3s(1/2) candidate in (131)Sn, and new lifetimes for excited states in (133)Sn and (209)Pb. This is the first report on excited-state lifetimes of (133)Sn, which allow for a unique test of the nuclear shell model and (132)Sn double-shell closure.
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Affiliation(s)
- J M Allmond
- JINPA, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - A E Stuchbery
- Department of Nuclear Physics, Australian National University, Canberra ACT 0200, Australia
| | - J R Beene
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - A Galindo-Uribarri
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA and Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - J F Liang
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - E Padilla-Rodal
- Instituto de Ciencias Nucleares, UNAM, AP 70-543, 04510 Mexico, D.F., Mexico
| | - D C Radford
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - R L Varner
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - A Ayres
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - J C Batchelder
- UNIRIB, Oak Ridge Associated Universities, Oak Ridge, Tennessee 37831, USA
| | - A Bey
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - C R Bingham
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA and Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - M E Howard
- Department of Physics and Astronomy, Rutgers University, New Brunswick, New Jersey 08903, USA
| | - K L Jones
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - B Manning
- Department of Physics and Astronomy, Rutgers University, New Brunswick, New Jersey 08903, USA
| | - P E Mueller
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - C D Nesaraja
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - S D Pain
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - W A Peters
- Oak Ridge Associated Universities, Oak Ridge, Tennessee 37830, USA
| | - A Ratkiewicz
- Department of Physics and Astronomy, Rutgers University, New Brunswick, New Jersey 08903, USA
| | - K T Schmitt
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA and Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - D Shapira
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - M S Smith
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - N J Stone
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA and Department of Physics, Oxford University, Oxford OX1 3PU, United Kingdom
| | - D W Stracener
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - C-H Yu
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
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5
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Kozub RL, Arbanas G, Adekola AS, Bardayan DW, Blackmon JC, Chae KY, Chipps KA, Cizewski JA, Erikson L, Hatarik R, Hix WR, Jones KL, Krolas W, Liang JF, Ma Z, Matei C, Moazen BH, Nesaraja CD, Pain SD, Shapira D, Shriner JF, Smith MS, Swan TP. Neutron single particle structure in 131Sn and direct neutron capture cross sections. Phys Rev Lett 2012; 109:172501. [PMID: 23215181 DOI: 10.1103/physrevlett.109.172501] [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: 05/29/2012] [Revised: 07/17/2012] [Indexed: 06/01/2023]
Abstract
Recent calculations suggest that the rate of neutron capture by (130)Sn has a significant impact on late-time nucleosynthesis in the r process. Direct capture into low-lying bound states is expected to be significant in neutron capture near the N=82 closed shell, so r-process reaction rates may be strongly impacted by the properties of neutron single particle states in this region. In order to investigate these properties, the (d,p) reaction has been studied in inverse kinematics using a 630 MeV beam of (130)Sn (4.8 MeV/u) and a (CD(2))(n) target. An array of Si strip detectors, including the Silicon Detector Array and an early implementation of the Oak Ridge Rutgers University Barrel Array, was used to detect reaction products. Results for the (130)Sn(d, p)(131)Sn reaction are found to be very similar to those from the previously reported (132)Sn(d, p)(133)Sn reaction. Direct-semidirect (n,γ) cross section calculations, based for the first time on experimental data, are presented. The uncertainties in these cross sections are thus reduced by orders of magnitude from previous estimates.
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Affiliation(s)
- R L Kozub
- Department of Physics, Tennessee Technological University, Cookeville, Tennessee 38505, USA
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6
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Schmitt KT, Jones KL, Bey A, Ahn SH, Bardayan DW, Blackmon JC, Brown SM, Chae KY, Chipps KA, Cizewski JA, Hahn KI, Kolata JJ, Kozub RL, Liang JF, Matei C, Matoš M, Matyas D, Moazen B, Nesaraja C, Nunes FM, O'Malley PD, Pain SD, Peters WA, Pittman ST, Roberts A, Shapira D, Shriner JF, Smith MS, Spassova I, Stracener DW, Villano AN, Wilson GL. Halo nucleus 11Be: a spectroscopic study via neutron transfer. Phys Rev Lett 2012; 108:192701. [PMID: 23003029 DOI: 10.1103/physrevlett.108.192701] [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: 01/18/2012] [Indexed: 06/01/2023]
Abstract
The best examples of halo nuclei, exotic systems with a diffuse nuclear cloud surrounding a tightly bound core, are found in the light, neutron-rich region, where the halo neutrons experience only weak binding and a weak, or no, potential barrier. Modern direct-reaction measurement techniques provide powerful probes of the structure of exotic nuclei. Despite more than four decades of these studies on the benchmark one-neutron halo nucleus 11Be, the spectroscopic factors for the two bound states remain poorly constrained. In the present work, the 10Be(d,p) reaction has been used in inverse kinematics at four beam energies to study the structure of 11Be. The spectroscopic factors extracted using the adiabatic model were found to be consistent across the four measurements and were largely insensitive to the optical potential used. The extracted spectroscopic factor for a neutron in an nℓj=2s(1/2) state coupled to the ground state of 10Be is 0.71(5). For the first excited state at 0.32 MeV, a spectroscopic factor of 0.62(4) is found for the halo neutron in a 1p(1/2) state.
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Affiliation(s)
- K T Schmitt
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
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7
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Kohley Z, Liang JF, Shapira D, Varner RL, Gross CJ, Allmond JM, Caraley AL, Coello EA, Favela F, Lagergren K, Mueller PE. Near-barrier fusion of Sn + Ni and Te + Ni systems: examining the correlation between nucleon transfer and fusion enhancement. Phys Rev Lett 2011; 107:202701. [PMID: 22181728 DOI: 10.1103/physrevlett.107.202701] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2011] [Indexed: 05/31/2023]
Abstract
The fusion excitation functions for radioactive (132)Sn + (58)Ni and stable (130)Te + (58,64)Ni were measured at energies near the Coulomb barrier. The coupling of transfer channels in heavy-ion fusion was examined through a comparison of Sn + Ni and Te + Ni systems, which have large variations in the number of positive Q-value nucleon transfer channels. In contrast with previous experimental comparisons, where increased sub-barrier fusion cross sections were observed in systems with positive Q-value neutron transfer channels, the reduced excitation functions were equivalent for the different Sn + Ni and Te + Ni systems. The present results suggest a dramatically different influence of positive Q-value transfer channels on the fusion process for the Sn + Ni and Te + Ni systems.
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Affiliation(s)
- Z Kohley
- Physics Division, Oak Ridge National Laboratory, Tennessee 37831, USA.
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8
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Estradé A, Matoš M, Schatz H, Amthor AM, Bazin D, Beard M, Becerril A, Brown EF, Cyburt R, Elliot T, Gade A, Galaviz D, George S, Gupta SS, Hix WR, Lau R, Lorusso G, Möller P, Pereira J, Portillo M, Rogers AM, Shapira D, Smith E, Stolz A, Wallace M, Wiescher M. Time-of-flight mass measurements for nuclear processes in neutron star crusts. Phys Rev Lett 2011; 107:172503. [PMID: 22107512 DOI: 10.1103/physrevlett.107.172503] [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: 03/25/2011] [Indexed: 05/31/2023]
Abstract
We present results from time-of-flight nuclear mass measurements at the National Superconducting Cyclotron Laboratory that are relevant for neutron star crust models. The masses of 16 neutron-rich nuclei in the scandium-nickel range were determined simultaneously, with the masses of (61)V, (63)Cr, (66)Mn, and (74)Ni measured for the first time with mass excesses of -30.510(890) MeV, -35.280(650) MeV, -36.900(790) MeV, and -49.210(990) MeV, respectively. With these results the locations of the dominant electron capture heat sources in the outer crust of accreting neutron stars that exhibit super bursts are now experimentally constrained. We find the experimental Q value for the (66)Fe→(66)Mn electron capture to be 2.1 MeV (2.6σ) smaller than predicted, resulting in the transition occurring significantly closer to the neutron star surface.
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Affiliation(s)
- A Estradé
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan, USA
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9
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Ben-Abraham SI, Quandt A, Shapira D. Aperiodic structures, order and disorder, complexity and entropy. Acta Crystallogr A 2011. [DOI: 10.1107/s0108767311095390] [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: 11/10/2022] Open
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10
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Shapira D, Ben-Abraham SI, Quandt, A. Multidimensional paperfolding substitution structures. Acta Crystallogr A 2011. [DOI: 10.1107/s010876731108411x] [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: 11/11/2022] Open
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11
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Rogers AM, Famiano MA, Lynch WG, Wallace MS, Amorini F, Bazin D, Charity RJ, Delaunay F, de Souza RT, Elson J, Gade A, Galaviz D, van Goethem MJ, Hudan S, Lee J, Lobastov S, Lukyanov S, Matoš M, Mocko M, Schatz H, Shapira D, Sobotka LG, Tsang MB, Verde G. Ground-state proton decay of 69Br and implications for the 68Se astrophysical rapid proton-capture process waiting point. Phys Rev Lett 2011; 106:252503. [PMID: 21770637 DOI: 10.1103/physrevlett.106.252503] [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: 12/17/2010] [Indexed: 05/31/2023]
Abstract
We report on the first direct measurement of the proton separation energy for the proton-unbound nucleus (69)Br. Bypassing the (68)Se waiting point in the rp process is directly related to the 2p-capture rate through (69)Br, which depends exponentially on the proton separation energy. We find a proton separation energy for (69)Br of Sp((69)Br )= -785(-40)(+34) keV; this is less bound compared to previous predictions which have relied on uncertain theoretical calculations. The influence of the extracted proton separation energy on the rp process occurring in type I x-ray bursts is examined within the context of a one-zone burst model.
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Affiliation(s)
- A M Rogers
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.
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12
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Jones KL, Adekola AS, Bardayan DW, Blackmon JC, Chae KY, Chipps KA, Cizewski JA, Erikson L, Harlin C, Hatarik R, Kapler R, Kozub RL, Liang JF, Livesay R, Ma Z, Moazen BH, Nesaraja CD, Nunes FM, Pain SD, Patterson NP, Shapira D, Shriner JF, Smith MS, Swan TP, Thomas JS. The magic nature of 132Sn explored through the single-particle states of 133Sn. Nature 2010; 465:454-7. [DOI: 10.1038/nature09048] [Citation(s) in RCA: 170] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2010] [Accepted: 03/26/2010] [Indexed: 11/09/2022]
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13
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Lee J, Tsang MB, Bazin D, Coupland D, Henzl V, Henzlova D, Kilburn M, Lynch WG, Rogers AM, Sanetullaev A, Signoracci A, Sun ZY, Youngs M, Chae KY, Charity RJ, Cheung HK, Famiano M, Hudan S, O'Malley P, Peters WA, Schmitt K, Shapira D, Sobotka LG. Neutron-proton asymmetry dependence of spectroscopic factors in ar isotopes. Phys Rev Lett 2010; 104:112701. [PMID: 20366470 DOI: 10.1103/physrevlett.104.112701] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2009] [Indexed: 05/29/2023]
Abstract
Spectroscopic factors have been extracted for proton-rich 34Ar and neutron-rich 46Ar using the (p, d) neutron transfer reaction. The experimental results show little reduction of the ground state neutron spectroscopic factor of the proton-rich nucleus 34Ar compared to that of 46Ar. The results suggest that correlations, which generally reduce such spectroscopic factors, do not depend strongly on the neutron-proton asymmetry of the nucleus in this isotopic region as was reported in knockout reactions. The present results are consistent with results from systematic studies of transfer reactions but inconsistent with the trends observed in knockout reaction measurements.
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Affiliation(s)
- Jenny Lee
- NSCL and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
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14
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Ademard G, Wieleczko J, Bonnet E, Chbihi A, Frankland J, La Commara M, Vigilante M, Rosato E, D’Onofrio A, Spadaccini G, Gomez del Campo J, Beck C, Borderie B, Bougault R, Dayras R, De Angelis G, Galindo-Uribarri A, Lautesse P, Le Neindre N, Parlog M, Pierroutsakou D, Rejmund F, Rivet M, Romoli M, Roy R, Shapira D. Influence Of The Neutron Richness On Binary Decays. EPJ Web of Conferences 2010. [DOI: 10.1051/epjconf/20100214002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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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Winger JA, Ilyushkin SV, Rykaczewski KP, Gross CJ, Batchelder JC, Goodin C, Grzywacz R, Hamilton JH, Korgul A, Królas W, Liddick SN, Mazzocchi C, Padgett S, Piechaczek A, Rajabali MM, Shapira D, Zganjar EF, Borzov IN. Large beta-delayed neutron emission probabilities in the 78Ni region. Phys Rev Lett 2009; 102:142502. [PMID: 19392431 DOI: 10.1103/physrevlett.102.142502] [Citation(s) in RCA: 5] [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: 01/21/2009] [Indexed: 05/27/2023]
Abstract
The beta-delayed neutron branching ratios (P{betan}) for nuclei near doubly magic 78Ni have been directly measured using a new method combining high-resolution mass separation, reacceleration, and digital beta-gamma spectroscopy of 238U fission products. The P{betan} values for the very neutron-rich isotopes ;{76-78}Cu and 83Ga were found to be much higher than previously reported and predicted. Revised calculations of the betan process, accounting for new mass measurements and an inversion of the pi2p{3/2} and pi1f{5/2} orbitals, are in better agreement with these new experimental results.
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Affiliation(s)
- J A Winger
- Department of Physics and Astronomy, Mississippi State University, Mississippi State, Mississippi 39762, USA.
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16
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Liang JF, Shapira D, Gross CJ, Beene JR, Bierman JD, Galindo-Uribarri A, Gomez del Campo J, Hausladen PA, Larochelle Y, Loveland W, Mueller PE, Peterson D, Radford DC, Stracener DW, Varner RL. Enhanced fusion-evaporation cross sections in neutron-rich 132Sn on 64Ni. Phys Rev Lett 2003; 91:152701. [PMID: 14611462 DOI: 10.1103/physrevlett.91.152701] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2003] [Indexed: 05/24/2023]
Abstract
Evaporation residue cross sections have been measured with neutron-rich radioactive 132Sn beams on 64Ni in the vicinity of the Coulomb barrier. The average beam intensity was 2 x 10(4) particles per second and the smallest cross section measured was less than 5 mb. Large sub-barrier fusion enhancement was observed. Coupled-channel calculations taking into account inelastic excitation significantly underpredict the measured cross sections below the barrier. The presence of several neutron transfer channels with large positive Q values suggests that multinucleon transfer may play an important role in enhancing the fusion of 132Sn and 64Ni.
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Affiliation(s)
- J F Liang
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
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17
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Stahl S, Shapira D. Trapeziometacarpal joint osteoarthritis and carpal tunnel syndrome: a new surgical approach for concomitant treatment. J Hand Surg Br 2003; 28:246-50. [PMID: 12809658 DOI: 10.1016/s0266-7681(02)00363-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [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
A new approach for the concomitant surgical treatment of trapeziometacarpal joint osteoarthritis and carpal tunnel syndrome through the same incision is described. The technique was used in 25 patients (20 women, five men; mean age, 56 years). At a mean follow-up of 27 months, there was complete disappearance of the symptoms of carpal tunnel syndrome in 20 of the 25 patients, incomplete but substantial relief in four patients, and no improvement in one patient. One patient had scar tenderness and another had a superficial wound infection. The surgical technique is simple, safe and cost-effective as it avoids separate operations for both pathologies. The procedure is not suitable for severe carpal tunnel syndrome or when direct visualization of the median nerve and the carpal tunnel is necessary.
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Affiliation(s)
- S Stahl
- Hand Surgery Unit, Rambam Medical Center, Technion-Israel Institute of Technology, Haifa, Israel
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18
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Shapira D, Saltmarsh M. Nuclear fusion in collapsing bubbles-is it there? An attempt to repeat the observation of nuclear emissions from sonoluminescence. Phys Rev Lett 2002; 89:104302. [PMID: 12225196 DOI: 10.1103/physrevlett.89.104302] [Citation(s) in RCA: 7] [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: 07/17/2002] [Indexed: 05/23/2023]
Abstract
We have repeated the experiment of Taleyarkhan et al. [Science 295, 1868 (2002)]] in an attempt to detect the emission of neutrons from d-d fusion during bubble collapse in deuterated acetone. Using the same cavitation apparatus, a more sophisticated data acquisition system, and a larger scintillator detector, we find no evidence for 2.5-MeV neutron emission correlated with sonoluminescence form collapsing bubbles. Any neutron emission that might occur is at least 4 orders of magnitude too small to explain the tritium production reported in Taleyarkhan et al. as being due to d-d fusion. We show that proper allowance for random coincidence rates in such experiments requires the simultaneous measurement of the count rates in the individual detectors.
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Affiliation(s)
- D Shapira
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA
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19
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Radford DC, Baktash C, Beene JR, Fuentes B, Galindo-Uribarri A, Gross CJ, Hausladen PA, Lewis TA, Mueller PE, Padilla E, Shapira D, Stracener DW, Yu CH, Barton CJ, Caprio MA, Coraggio L, Covello A, Gargano A, Hartley DJ, Zamfir NV. Coulomb excitation of radioactive 132,134,136Te beams and the low B(E2) of 136Te. Phys Rev Lett 2002; 88:222501. [PMID: 12059416 DOI: 10.1103/physrevlett.88.222501] [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: 12/26/2001] [Indexed: 05/23/2023]
Abstract
The B(E2;0(+)-->2+) values for the first 2+ excited states of neutron-rich 132,134,136Te have been measured using Coulomb excitation of radioactive ion beams. The B(E2) values obtained for 132,134Te are in excellent agreement with expectations based on the systematics of heavy stable Te isotopes, while that for 136Te is unexpectedly small. These results are discussed in terms of proton-neutron configuration mixing and shell-model calculations using realistic effective interactions.
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Affiliation(s)
- D C Radford
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
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23
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Galindo-Uribarri A, Beene JR, Gross CJ, Liang JF, Halbert ML, Stracener DW, Shapira D, Varner RL, Chavez-Lomeli E, Ortiz ME. Decay of a Resonance in 18Ne by the Simultaneous Emission of Two Protons. Phys Rev Lett 2001; 86:43-46. [PMID: 11136089 DOI: 10.1103/physrevlett.86.43] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2000] [Indexed: 05/23/2023]
Abstract
Radioactive ion beams of 17F were used to study several resonance states in 18Ne. Clear evidence for simultaneous two-proton emission from the 6.15 MeV state (Jpi = 1(-)) in 18Ne has been observed with the reaction 17F+1H. Because of limited angular coverage, the data did not differentiate between the two possible mechanisms of simultaneous decay, diproton (2He) emission or direct three-body decay. The two-proton partial width was found to be 21+/-3 eV assuming 2He emission and 57+/-6 eV assuming three-body decay. The total width of the 1(-) state was measured to be 50+/-5 keV. Several additional resonances that decay by single proton emission were also studied.
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24
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Tincknell ML, Clark RL, Woody C, Lissauer D, Takai H, Ray A, Shapira D, Erd C, Schukraft J, Willis W. Low transverse momentum photon production in proton-nucleus collisions at 18 GeV/c. Phys Rev C Nucl Phys 1996; 54:1918-1929. [PMID: 9971541 DOI: 10.1103/physrevc.54.1918] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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25
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Shapira D, Korolija M, Kim HJ, Teh K, Shea J, Wieleczko JP, Chávez E, Ortiz ME, Dacal A, Volant C, D'Onofrio A. Light particle-evaporation residue coincidences for the 79Br+27Al system at 11.8 MeV/nucleon. Phys Rev C Nucl Phys 1996; 53:222-236. [PMID: 9970932 DOI: 10.1103/physrevc.53.222] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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26
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Garcia-Solis EJ, Mignerey AC, Madani H, Marchetti AA, Russ DE, Shapira D. Mass and charge distributions for the reaction 40Ca + 209Bi at 600 MeV. Phys Rev C Nucl Phys 1995; 52:3114-3125. [PMID: 9970859 DOI: 10.1103/physrevc.52.3114] [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] [Indexed: 05/22/2023]
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27
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Shapira D, Scharf Y. Insufficiency fracture of the distal tibia mimicking arthritis in a rheumatoid arthritis patient. The possible role of methotrexate treatment. Clin Exp Rheumatol 1995; 13:130-1. [PMID: 7774097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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28
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Korolija M, Shapira D, Chavez E, Cindro N. Proton-proton correlations: Determination of the source size and lifetime from deep inelastic collisions of 58Ni+58Ni at 15 MeV/nucleon. Phys Rev C Nucl Phys 1994; 49:272-278. [PMID: 9969220 DOI: 10.1103/physrevc.49.272] [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] [Indexed: 05/22/2023]
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29
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Antos J, Beker H, Brons S, Bussmann K, Dagan S, Drees A, Erd C, Esten MJ, Fabjan CW, Glässel P, Goerlach U, Hedberg V, Lissauer D, Mazzoni MA, McCubbin NA, Neubert M, Nevski P, Olsen L, Pfeiffer A, Ray A, Schukraft J, Shapira D, Soltani J, Specht HJ, Stumer I, Thompson J, Veenhof RJ, Willis WJ, Woody C. Soft photon production in 450 GeV/cp-Be collisions. ACTA ACUST UNITED AC 1993. [DOI: 10.1007/bf01562546] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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30
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Rentsch D, Metag V, Novotny R, Pelte D, Shapira D. Multifragment events in the reaction 58Ni+27Al at 15.8 MeV/nucleon. Phys Rev C Nucl Phys 1993; 48:2789-2799. [PMID: 9969156 DOI: 10.1103/physrevc.48.2789] [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] [Indexed: 05/22/2023]
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31
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Brandan ME, Alfaro JR, Menchaca-Rocha A, Satchler GR, Stelson PH, Kim HJ, Shapira D. Elastic scattering of 58Ni+27Al at near-barrier energies. Phys Rev C Nucl Phys 1993; 48:1147-1151. [PMID: 9968946 DOI: 10.1103/physrevc.48.1147] [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] [Indexed: 05/22/2023]
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32
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Shapira D, Stelson PH. Role of neutron flow in the enhancement of heavy ion fusion at energies below the Coulomb barrier and the systematics of threshold barriers. Phys Rev C Nucl Phys 1993; 47:1666-1671. [PMID: 9968613 DOI: 10.1103/physrevc.47.1666] [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] [Indexed: 05/22/2023]
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33
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Blumenthal DJ, Greene SV, Mitchell JT, Bromley DA, Shapira D, Ray A, Hindi MM. Evolution towards equilibration in orbiting interactions. Phys Rev C Nucl Phys 1992; 46:1946-1950. [PMID: 9968313 DOI: 10.1103/physrevc.46.1946] [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] [Indexed: 05/22/2023]
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34
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Korolija M, Shapira D, Cindro N, Kim HJ, Teh K, Shea JY. Exclusive p-p correlations from the 58Ni+58Ni reaction at. Phys Rev Lett 1991; 67:572-575. [PMID: 10044932 DOI: 10.1103/physrevlett.67.572] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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35
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Ray A, Shapira D, Kim HJ, Beck C, Djerroud B, Heusch B, Blumenthal D, Shivakumar B. Compound nucleus origin of back-angle yields in the 31P+16O and 35Cl+12C reactions. Phys Rev C Nucl Phys 1991; 44:514-517. [PMID: 9967424 DOI: 10.1103/physrevc.44.514] [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] [Indexed: 05/22/2023]
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Segal R, Caspi D, Sukenik S, Horowitz I, Rubinov A, Fluser D, Scharf Y, Shapira D, Weinberger A, Gedz D. [Sulfasalazine in rheumatoid arthritis]. Harefuah 1991; 120:577-81. [PMID: 1682225] [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: 12/28/2022]
Abstract
Sulfasalazine (SLZ) is now a second-line treatment in rheumatoid arthritis (RA), as well as in psoriatic arthritis and ankylosing spondylitis. 54 patients with active RA were treated with enteric coated SLZ (2 g daily) in a 24-week open study. Clinical and laboratory parameters of disease activity were monitored initially and thereafter at 2-week intervals for the first 2 months, and then at 4-week intervals until the end of the 24-week study. There was significant clinical improvement at the end, as shown by scores for joint pain (Ritchie), grip strength and morning stiffness (p less than 0.0001, less than 0.0001 and less than 0.01, respectively, by paired t test). Clinical improvement was accompanied by significant decrease in erythrocyte sedimentation rate and increase in hemoglobin (p less than 0.002 and less than 0.016, respectively). There was improvement in some cases as early as 3 weeks after starting therapy. The drop-out rate was significant: 19/54 (35%), most (13) due to side-effects, mainly gastrointestinal; none of the side-effects were serious. Our results, similar to those of other studies, indicate that despite the high rate of side effects, SLZ is an effective, second-line drug for RA.
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Affiliation(s)
- R Segal
- Rheumatology Dept. of Ichilov Hospital, Tel Aviv
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37
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Ray A, Shapira D, Halbert ML, Kim HJ, Sullivan JP, Shivakumar B, Mitchell J. Spin alignment and density matrix measurement in 28Si+12C orbiting reaction. Phys Rev C Nucl Phys 1991; 43:1789-1799. [PMID: 9967229 DOI: 10.1103/physrevc.43.1789] [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] [Indexed: 05/22/2023]
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Kim HJ, Shapira D, Stelson PH, Napoli D. Multinucleon-transfer reactions for the 50Ti+93Nb system at sub- and near-barrier energies. Phys Rev C Nucl Phys 1991; 43:1321-1330. [PMID: 9967172 DOI: 10.1103/physrevc.43.1321] [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] [Indexed: 05/22/2023]
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39
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Utsunomiya H, Lui Y, Haenni DR, Dejbakhsh H, Cooke L, Srivastava BK, Turmel W, O'Kelly D, Schmitt RP, Shapira D, Ray A, Udagawa T. Breakup of 7Li near the alpha -t threshold and a possible probe of radiative-capture processes. Phys Rev Lett 1990; 65:847-850. [PMID: 10043038 DOI: 10.1103/physrevlett.65.847] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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40
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Stelson PH, Kim HJ, Beckerman M, Shapira D, Robinson RL. Fusion cross sections for 46,50Ti+90Zr,93Nb and some systematics of heavy-ion fusion at barrier and subbarrier energies. Phys Rev C Nucl Phys 1990; 41:1584-1599. [PMID: 9966505 DOI: 10.1103/physrevc.41.1584] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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41
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Brik R, Shapira D, Lorber M, Nahir M. [The liver in juvenile rheumatoid arthritis]. Harefuah 1989; 117:126-8. [PMID: 2485752] [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: 01/01/2023]
Abstract
Hepatic involvement in juvenile rheumatoid arthritis of the systemic type (JRA) is a diagnostic challenge because of the varied clinical picture it presents. We describe a 21-year-old woman in whom JRA had started at the age of 4 years as an illness resembling familial Mediterranean fever. This long-standing illness was complicated by liver damage and needle biopsy showed massive hepatic deposition of amyloid. It is possible that this patient may have developed JRA as a complication of familial Mediterranean fever.
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Affiliation(s)
- R Brik
- Pediatrics Dept., Rambam Medical Center, Haifa
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42
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Rajasekariah GR, Edward S, Shapira D, Tapsall J, Walsh J, Ho J, Hopper K, Pucci A. Direct detection of Neisseria gonorrhoeae with monoclonal antibodies characterized by serotyping reagents. J Clin Microbiol 1989; 27:1700-3. [PMID: 2475525 PMCID: PMC267649 DOI: 10.1128/jcm.27.7.1700-1703.1989] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
A panel of monoclonal antibodies (MAbs) directed to outer membrane protein I were generated with the ultimate aim of detecting Neisseria gonorrhoeae in patient samples by a direct immunofluorescence (IF) test. In an initial evaluation of the sensitivity of these reagents, a cocktail of six IF MAbs recognized 491 (91%) of 540 gonococci isolates from several centers in Sydney, Australia. IF MAbs designated 185 and 228 recognized serovars of WI serogroup and IF MAbs 208, 210, and 312 recognized serovars of WII/III serogroup. IF MAb 198 recognized serovars within both serogroups. Three additional IF MAbs, designated 322, 323, and 330, were then generated by using strains which failed to react with the original MAb cocktail and which belonged to particular serovars. The new cocktail of nine IF MAbs recognized 96% of the gonococcal isolates, which incidentally contained representatives of serovars shown to have a worldwide distribution in previous studies. Although subtle differences were apparent in the reaction patterns found with coagglutination (serotyping) and IF, there nonetheless seems to be merit in the approach of continually evaluating the sensitivity of diagnostic reagents such as MAbs. This is especially true with an organism such as N. gonorrhoeae, which has the capacity to regularly alter the antigenic structure of its outer membrane proteins.
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43
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Ayik S, Shapira D, Shivakumar B. Transport description for capture processes in nuclear collisions. Phys Rev C Nucl Phys 1988; 38:2610-2620. [PMID: 9955102 DOI: 10.1103/physrevc.38.2610] [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] [Indexed: 05/22/2023]
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44
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Kim HJ, Hindi MM, Shapira D, Stelson PH. Transfer reactions for the 50Ti + 90Zr system below the Coulomb barrier. Phys Rev C Nucl Phys 1988; 38:2081-2085. [PMID: 9955030 DOI: 10.1103/physrevc.38.2081] [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] [Indexed: 05/22/2023]
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45
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46
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Burks BL, Fernandes MA, Satchler GR, Horen DJ, Bertrand FE, Blankenship JL, Ford JL, Gross EE, Hensley DC, Sayer RO, Shapira D, Sjoreen TP. Optical model and coupled-channels analyses of the elastic and inelastic scattering of 18O from 28Si at 352 MeV. Phys Rev C Nucl Phys 1988; 38:1680-1691. [PMID: 9954979 DOI: 10.1103/physrevc.38.1680] [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] [Indexed: 05/22/2023]
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47
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Harmon BA, Shapira D, Stelson PH, Burks BL, Erb KA, Shivakumar B, Teh K, Thornton ST. Effect of entrance channel asymmetry on fusion reactions leading to compound nuclei with A=40,42. Phys Rev C Nucl Phys 1988; 38:572-575. [PMID: 9954842 DOI: 10.1103/physrevc.38.572] [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] [Indexed: 05/22/2023]
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48
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Safadi M, Shapira D, Leichter I, Reznick A, Silbermann M. Ability of different techniques of measuring bone mass to determine vertebral bone loss in aging female rats. Calcif Tissue Int 1988; 42:375-82. [PMID: 3135107 DOI: 10.1007/bf02556356] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Changes in vertebral trabecular bone were quantified in female Wistar rats. This study utilized single photon absorptiometry for the measurement of bone mineral content (BMC), quantitative computed tomography (QCT) for the measurement of bone mineral density (BMD), and image analysis histomorphometry for the measurement of trabecular bone volume (TBV). The above measurements were accompanied by biochemical assays of protein and calcium concentrations in the tissues. Also, the activity of bone alkaline and acid phosphatases was measured. Lumbar vertebrae (L4, L5) in old rats 27 months old, compared with those of young rats 7 months old, showed significant decreases in BMC, BMD, TBV, protein and calcium, and enzyme activity. A high degree of correlation was recorded between the above changes. The various changes were accompanied by a marked reduction in the overall wet weight of the vertebrae. Hence, new noninvasive methods to quantitate bone mass can be applied in vivo to small laboratory animals such as the rat. These methods are much more accurate than standard radiographs in quantitating bone loss and are, therefore, recommended for experimental longitudinal studies related to aging of the skeleton.
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Affiliation(s)
- M Safadi
- Rappaport Family Institute for Research in the Medical Sciences, Faculty of Medicine, Haifa, Israel
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49
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Shivakumar B, Shapira D, Stelson PH, Ayik S, Harmon BA, Teh K, Bromley DA. 28Si. Phys Rev C Nucl Phys 1988; 37:652-663. [PMID: 9954486 DOI: 10.1103/physrevc.37.652] [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] [Indexed: 05/22/2023]
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50
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Sanderson DP, Kemper KW, Shapira D, Varner RL, Shivakumar B. Sequential breakup cross section of 6Li. Phys Rev C Nucl Phys 1987; 36:1865-1869. [PMID: 9954295 DOI: 10.1103/physrevc.36.1865] [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] [Indexed: 05/22/2023]
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