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Campbell SE, Bollen G, Brown BA, Dockery A, Ireland CM, Minamisono K, Puentes D, Rickey BJ, Ringle R, Yandow IT, Fossez K, Ortiz-Cortes A, Schwarz S, Sumithrarachchi CS, Villari ACC. Precision Mass Measurement of the Proton Dripline Halo Candidate ^{22}Al. PHYSICAL REVIEW LETTERS 2024; 132:152501. [PMID: 38683002 DOI: 10.1103/physrevlett.132.152501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2023] [Accepted: 03/12/2024] [Indexed: 05/01/2024]
Abstract
We report the first mass measurement of the proton-halo candidate ^{22}Al performed with the low energy beam ion trap facility's 9.4 T Penning trap mass spectrometer at facility for rare isotope beams. This measurement completes the mass information for the lightest remaining proton-dripline nucleus achievable with Penning traps. ^{22}Al has been the subject of recent interest regarding a possible halo structure from the observation of an exceptionally large isospin asymmetry [J. Lee et al., Large isospin asymmetry in Si22/O22 Mirror Gamow-Teller transitions reveals the halo structure of ^{22}Al, Phys. Rev. Lett. 125, 192503 (2020).PRLTAO0031-900710.1103/PhysRevLett.125.192503]. The measured mass excess value of ME=18 092.5(3) keV, corresponding to an exceptionally small proton separation energy of S_{p}=100.4(8) keV, is compatible with the suggested halo structure. Our result agrees well with predictions from sd-shell USD Hamiltonians. While USD Hamiltonians predict deformation in the ^{22}Al ground state with minimal 1s_{1/2} occupation in the proton shell, a particle-plus-rotor model in the continuum suggests that a proton halo could form at large quadrupole deformation. These results emphasize the need for a charge radius measurement to conclusively determine the halo nature.
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Affiliation(s)
- S E Campbell
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA and Facility for Rare Isotope Beams, East Lansing, Michigan 48824, USA
| | - G Bollen
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA and Facility for Rare Isotope Beams, East Lansing, Michigan 48824, USA
| | - B A Brown
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA and Facility for Rare Isotope Beams, East Lansing, Michigan 48824, USA
| | - A Dockery
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA and Facility for Rare Isotope Beams, East Lansing, Michigan 48824, USA
| | - C M Ireland
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA and Facility for Rare Isotope Beams, East Lansing, Michigan 48824, USA
| | - K Minamisono
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA and Facility for Rare Isotope Beams, East Lansing, Michigan 48824, USA
| | - D Puentes
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA and Facility for Rare Isotope Beams, East Lansing, Michigan 48824, USA
| | - B J Rickey
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA and Facility for Rare Isotope Beams, East Lansing, Michigan 48824, USA
| | - R Ringle
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA and Facility for Rare Isotope Beams, East Lansing, Michigan 48824, USA
| | - I T Yandow
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA and Facility for Rare Isotope Beams, East Lansing, Michigan 48824, USA
| | - K Fossez
- Department of Physics, Florida State University, Tallahassee, Florida 32306, USA and Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - A Ortiz-Cortes
- Facility for Rare Isotope Beams, East Lansing, Michigan 48824, USA
| | - S Schwarz
- Facility for Rare Isotope Beams, East Lansing, Michigan 48824, USA
| | | | - A C C Villari
- Facility for Rare Isotope Beams, East Lansing, Michigan 48824, USA
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Orford R, Vassh N, Clark JA, McLaughlin GC, Mumpower MR, Savard G, Surman R, Aprahamian A, Buchinger F, Burkey MT, Gorelov DA, Hirsh TY, Klimes JW, Morgan GE, Nystrom A, Sharma KS. Precision Mass Measurements of Neutron-Rich Neodymium and Samarium Isotopes and Their Role in Understanding Rare-Earth Peak Formation. PHYSICAL REVIEW LETTERS 2018; 120:262702. [PMID: 30004776 DOI: 10.1103/physrevlett.120.262702] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2017] [Revised: 03/02/2018] [Indexed: 06/08/2023]
Abstract
The Canadian Penning Trap mass spectrometer at the Californium Rare Isotope Breeder Upgrade (CARIBU) facility was used to measure the masses of eight neutron-rich isotopes of Nd and Sm. These measurements are the first to push into the region of nuclear masses relevant to the formation of the rare-earth abundance peak at A∼165 by the rapid neutron-capture process. We compare our results with theoretical predictions obtained from "reverse engineering" the mass surface that best reproduces the observed solar abundances in this region through a Markov chain Monte Carlo technique. Our measured masses are consistent with the reverse-engineering predictions for a neutron star merger wind scenario.
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Affiliation(s)
- R Orford
- Department of Physics, McGill University, Montréal, Québec H3A 2T8, Canada
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - N Vassh
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - J A Clark
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
- Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
| | - G C McLaughlin
- Department of Physics, North Carolina State University, Raleigh, North Carolina 27695, USA
| | - M R Mumpower
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - G Savard
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
- Department of Physics, University of Chicago, Chicago, Illinois 60637, USA
| | - R Surman
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - A Aprahamian
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - F Buchinger
- Department of Physics, McGill University, Montréal, Québec H3A 2T8, Canada
| | - M T Burkey
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
- Department of Physics, University of Chicago, Chicago, Illinois 60637, USA
| | - D A Gorelov
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
- Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
| | - T Y Hirsh
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
- Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
- Soreq NRC, Yavne 81800, Israel
| | - J W Klimes
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - G E Morgan
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
- Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
| | - A Nystrom
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - K S Sharma
- Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
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3
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Valverde AA, Brodeur M, Bollen G, Eibach M, Gulyuz K, Hamaker A, Izzo C, Ong WJ, Puentes D, Redshaw M, Ringle R, Sandler R, Schwarz S, Sumithrarachchi CS, Surbrook J, Villari ACC, Yandow IT. High-Precision Mass Measurement of ^{56}Cu and the Redirection of the rp-Process Flow. PHYSICAL REVIEW LETTERS 2018; 120:032701. [PMID: 29400535 DOI: 10.1103/physrevlett.120.032701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2017] [Revised: 10/02/2017] [Indexed: 06/07/2023]
Abstract
We report the mass measurement of ^{56}Cu, using the LEBIT 9.4 T Penning trap mass spectrometer at the National Superconducting Cyclotron Laboratory at Michigan State University. The mass of ^{56}Cu is critical for constraining the reaction rates of the ^{55}Ni(p,γ) ^{56}Cu(p,γ) ^{57}Zn(β^{+}) ^{57}Cu bypass around the ^{56}Ni waiting point. Previous recommended mass excess values have disagreed by several hundred keV. Our new value, ME=-38626.7(7.1) keV, is a factor of 30 more precise than the extrapolated value suggested in the 2012 atomic mass evaluation [Chin. Phys. C 36, 1603 (2012)CPCHCQ1674-113710.1088/1674-1137/36/12/003], and more than a factor of 12 more precise than values calculated using local mass extrapolations, while agreeing with the newest 2016 atomic mass evaluation value [Chin. Phys. C 41, 030003 (2017)CPCHCQ1674-113710.1088/1674-1137/41/3/030003]. The new experimental average, using our new mass and the value from AME2016, is used to calculate the astrophysical ^{55}Ni(p,γ) and ^{56}Cu(p,γ) forward and reverse rates and perform reaction network calculations of the rp process. These show that the rp-process flow redirects around the ^{56}Ni waiting point through the ^{55}Ni(p,γ) route, allowing it to proceed to higher masses more quickly and resulting in a reduction in ashes around this waiting point and an enhancement to higher-mass ashes.
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Affiliation(s)
- A A Valverde
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - M Brodeur
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - G Bollen
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- Facility for Rare Isotope Beams, East Lansing, Michigan 48824, USA
| | - M Eibach
- Institut für Physik, Universität Greifswald, 17487 Greifswald, Germany
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
| | - K Gulyuz
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
| | - A Hamaker
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
| | - C Izzo
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
| | - W-J Ong
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
| | - D Puentes
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
| | - M Redshaw
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
- Department of Physics, Central Michigan University, Mount Pleasant, Michigan 48859, USA
- Science of Advanced Materials Program, Central Michigan University, Mount Pleasant, Michigan 48859, USA
| | - R Ringle
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
| | - R Sandler
- Department of Physics, Central Michigan University, Mount Pleasant, Michigan 48859, USA
- Science of Advanced Materials Program, Central Michigan University, Mount Pleasant, Michigan 48859, USA
| | - S Schwarz
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
| | - C S Sumithrarachchi
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
| | - J Surbrook
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
| | - A C C Villari
- Facility for Rare Isotope Beams, East Lansing, Michigan 48824, USA
| | - I T Yandow
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
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Van Schelt J, Lascar D, Savard G, Clark JA, Bertone PF, Caldwell S, Chaudhuri A, Levand AF, Li G, Morgan GE, Orford R, Segel RE, Sharma KS, Sternberg MG. First results from the CARIBU facility: mass measurements on the r-process path. PHYSICAL REVIEW LETTERS 2013; 111:061102. [PMID: 23971550 DOI: 10.1103/physrevlett.111.061102] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2013] [Indexed: 06/02/2023]
Abstract
The Canadian Penning Trap mass spectrometer has made mass measurements of 33 neutron-rich nuclides provided by the new Californium Rare Isotope Breeder Upgrade facility at Argonne National Laboratory. The studied region includes the 132Sn double shell closure and ranges in Z from In to Cs, with Sn isotopes measured out to A=135, and the typical measurement precision is at the 100 ppb level or better. The region encompasses a possible major waiting point of the astrophysical r process, and the impact of the masses on the r process is shown through a series of simulations. These first-ever simulations with direct mass information on this waiting point show significant increases in waiting time at Sn and Sb in comparison with commonly used mass models, demonstrating the inadequacy of existing models for accurate r-process calculations.
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Affiliation(s)
- J Van Schelt
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
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Lincoln DL, Holt JD, Bollen G, Brodeur M, Bustabad S, Engel J, Novario SJ, Redshaw M, Ringle R, Schwarz S. First direct double-β decay Q-value measurement of 82Se in support of understanding the nature of the neutrino. PHYSICAL REVIEW LETTERS 2013; 110:012501. [PMID: 23383782 DOI: 10.1103/physrevlett.110.012501] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2012] [Indexed: 06/01/2023]
Abstract
In anticipation of results from current and future double-β decay studies, we report a measurement resulting in a (82)Se double-β decay Q value of 2997.9(3) keV, an order of magnitude more precise than the currently accepted value. We also present preliminary results of a calculation of the (82)Se neutrinoless double-β decay nuclear matrix element that corrects in part for the small size of the shell model single-particle space. The results of this work are important for designing next generation double-β decay experiments and for the theoretical interpretations of their observations.
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Affiliation(s)
- David L Lincoln
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.
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6
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Savory J, Schury P, Bachelet C, Block M, Bollen G, Facina M, Folden CM, Guénaut C, Kwan E, Kwiatkowski AA, Morrissey DJ, Pang GK, Prinke A, Ringle R, Schatz H, Schwarz S, Sumithrarachchi CS. rp process and masses of N approximately Z approximately 34 nuclides. PHYSICAL REVIEW LETTERS 2009; 102:132501. [PMID: 19392349 DOI: 10.1103/physrevlett.102.132501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2008] [Indexed: 05/27/2023]
Abstract
High-precision Penning-trap mass measurements of the N approximately Z approximately 34 nuclides 68Se, 70Se, (70m)Br, and 71Br were performed, reaching experimental uncertainties of 0.5-15 keV. The new and improved mass data together with theoretical Coulomb displacement energies were used as input for rp process network calculations. An increase in the effective lifetime of the waiting point nucleus 68Se was found, and more precise information was obtained on the luminosity during a type I x-ray burst along with the final elemental abundances after the burst.
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Affiliation(s)
- J Savory
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.
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7
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Block M, Bachelet C, Bollen G, Facina M, Folden CM, Guénaut C, Kwiatkowski AA, Morrissey DJ, Pang GK, Prinke A, Ringle R, Savory J, Schury P, Schwarz S. Discovery of a nuclear isomer in 65Fe with penning trap mass spectrometry. PHYSICAL REVIEW LETTERS 2008; 100:132501. [PMID: 18517939 DOI: 10.1103/physrevlett.100.132501] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2007] [Revised: 01/10/2008] [Indexed: 05/26/2023]
Abstract
A new long-lived isomeric state in (65)Fe has been discovered with Penning trap mass spectrometry and high-precision mass measurements of the neutron-rich isotopes (63-65)Fe and (64-66)Co have been performed with the Low-Energy Beam and Ion Trap Facility at the NSCL. For the new isomer in (65)Fe an excitation energy of 402(5) keV has been determined from the measured mass difference between the isomeric and ground states. The mass uncertainties of all isotopes have been reduced by a factor of 10-100 compared to previous results. In the case of (64)Co the previous mass value was found to deviate by about 5 standard deviations from the new measurement.
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Affiliation(s)
- M Block
- National Superconducting Cyclotron Laboratory (NSCL), Michigan State University, East Lansing, Michigan, USA.
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8
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Bollen G, Davies D, Facina M, Huikari J, Kwan E, Lofy PA, Morrissey DJ, Prinke A, Ringle R, Savory J, Schury P, Schwarz S, Sumithrarachchi C, Sun T, Weissman L. Experiments with thermalized rare isotope beams from projectile fragmentation: a precision mass measurement of the superallowed beta emitter 38Ca. PHYSICAL REVIEW LETTERS 2006; 96:152501. [PMID: 16712152 DOI: 10.1103/physrevlett.96.152501] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2006] [Indexed: 05/09/2023]
Abstract
The mass of the short-lived radio nuclide 38Ca (T(1/2) = 440 ms) has been measured with the 9.4-T Penning trap mass spectrometer of the Low-Energy Beam and Ion Trap Facility. A mass uncertainty of deltam = 280 eV has been achieved, corresponding to deltam/m = 8 x 10(-9). The result makes 38Ca, a superallowed beta emitter, a new candidate to test the conserved-vector-current hypothesis. The experiment is also the first demonstration that short-lived radioactive isotopes produced by projectile fragmentation of relativistic heavy-ion beams can be slowed down and prepared such that precision experiments of this kind are possible.
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Affiliation(s)
- G Bollen
- National Superconducting Cyclotron Laboratory. Michigan State University, East Lansing, Michigan, USA.
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11
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MISTRAL: A new program for precise atomic mass determinations of nuclides far from stability. ACTA ACUST UNITED AC 1996. [DOI: 10.1007/bf02274914] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Williams P, Barber RC, Sharma KS, Duckworth HE. Unsuitability of (12)C 60 as a standard of atomic weight. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 1995; 6:1243-1246. [PMID: 24214076 DOI: 10.1016/1044-0305(95)00633-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/1995] [Revised: 09/13/1995] [Accepted: 09/14/1995] [Indexed: 06/02/2023]
Abstract
A critical discussion is given of the suggestion by Dougherty et al. (J. Am. Soc. Mass Spectrom. 1994, 5, 120) that the (12)C60 molecule replace the (12)C atom as the primary standard of atomic mass. Adoption of the proposed standard would require that the unified atomic weight/mass scale, finally achieved with much difficulty in 1960, be abandoned without demonstrable benefit. Furthermore, the proposed standard has a molecular mass that is inherently ambiguous at a level that makes it unacceptable for that purpose.
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Affiliation(s)
- P Williams
- Department of Chemistry and Biochemistry, Arizona State University, 85287-1604, Tempe, AZ
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König M, Bollen G, Kluge HJ, Otto T, Szerypo J. Quadrupole excitation of stored ion motion at the true cyclotron frequency. ACTA ACUST UNITED AC 1995. [DOI: 10.1016/0168-1176(95)04146-c] [Citation(s) in RCA: 337] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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14
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Kluge HJ, Bollen G. ISOLTRAP: A tandem penning trap mass spectrometer for radioactive isotopes. ACTA ACUST UNITED AC 1993. [DOI: 10.1007/bf00567247] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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