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Hoff DEM, Kolos K, Misch GW, Ray D, Liu B, Valverde AA, Brodeur M, Burdette DP, Callahan N, Clark JA, Gallant AT, Kondev FG, Morgan GE, Mumpower MR, Orford R, Porter WS, Rivero F, Savard G, Scielzo ND, Sharma KS, Sieja K, Sprouse TM, Varriano L. Direct Mass Measurements to Inform the Behavior of ^{128m}Sb in Nucleosynthetic Environments. PHYSICAL REVIEW LETTERS 2023; 131:262701. [PMID: 38215364 DOI: 10.1103/physrevlett.131.262701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2023] [Revised: 07/25/2023] [Accepted: 11/13/2023] [Indexed: 01/14/2024]
Abstract
Nuclear isomer effects are pivotal in understanding nuclear astrophysics, particularly in the rapid neutron-capture process where the population of metastable isomers can alter the radioactive decay paths of nuclei produced during astrophysical events. The β-decaying isomer ^{128m}Sb was identified as potentially impactful since the β-decay pathway along the A=128 isobar funnels into this state bypassing the ground state. We report the first direct mass measurements of the ^{128}Sb isomer and ground state using the Canadian Penning Trap mass spectrometer at Argonne National Laboratory. We find mass excesses of -84564.8(25) keV and -84608.8(21) keV, respectively, resulting in an excitation energy for the isomer of 43.9(33) keV. These results provide the first key nuclear data input for understanding the role of ^{128m}Sb in nucleosynthesis, and we show that it will influence the flow of the rapid neutron-capture process.
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Affiliation(s)
- D E M Hoff
- Nuclear and Chemical Sciences Division, Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - K Kolos
- Nuclear and Chemical Sciences Division, Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - G W Misch
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - D Ray
- Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
- Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - B Liu
- Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
- Department of Physics and Astronomy, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - A A Valverde
- Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
- Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - M Brodeur
- Department of Physics and Astronomy, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - D P Burdette
- Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - N Callahan
- Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - J A Clark
- Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - A T Gallant
- Nuclear and Chemical Sciences Division, Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - F G Kondev
- Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - G E Morgan
- Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - M R Mumpower
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
- Center for Theoretical Astrophysics, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
- Joint Institute for Nuclear Astrophysics-Center for the Evolution of the Elements, Michigan State University, East Lansing, Michigan 48824, USA
| | - R Orford
- Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - W S Porter
- Department of Physics and Astronomy, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - F Rivero
- Department of Physics and Astronomy, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - G Savard
- Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
- Department of Physics, University of Chicago, Chicago, Illinois 60637, USA
| | - N D Scielzo
- Nuclear and Chemical Sciences Division, Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - K S Sharma
- Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
| | - K Sieja
- Université de Strasbourg, IPHC, 23 rue du Loess 67037 Strasbourg, France CNRS, UMR7178, 67037 Strasbourg, France
| | - T M Sprouse
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - L Varriano
- Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
- Department of Physics, University of Chicago, Chicago, Illinois 60637, USA
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