Journal
NATURE PHYSICS
Volume 17, Issue 10, Pages 1099-+Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41567-021-01326-9
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Funding
- ISOLDE technical group
- Max Planck Society
- French Institut National de Physique Nucleaire et de Physique des Particules [IN2P3]
- European Research Council (ERC) through the European Union [682841, 654002]
- Bundesministerium fur Bildung und Forschung (BMBF) [05P15ODCIA, 05P15HGCIA, 05P18HGCIA, 05P18RDFN1]
- BMBF [05E12CHA]
- US Department of Energy, Office of Science, Office of Nuclear Physics [DE-FG02-96ER40963, DE-FG02-97ER41014]
- US Department of Energy, Office of Science, Office of Advanced Scientific Computing Research and Office of Nuclear Physics, Scientific Discovery through Advanced Computing (SciDAC) programme [DE-SC0018223]
- National Research Council of Canada
- NSERC
- Innovative and Novel Computational Impact on Theory and Experiment (INCITE) Program
- Office of Science of the Department of Energy [DE-AC05-00OR22725]
- Oak Cluster at TRIUMF
- Australian Research Council [DE190101137]
- Australian Research Council [DE190101137] Funding Source: Australian Research Council
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This study conducted direct mass measurements of the odd-proton nuclide Sn-100 and compared the results with ab initio many-body calculations, uncovering a discrepancy in the mass values deduced from beta-decay results.
The tin isotope Sn-100 is of singular interest for nuclear structure due to its closed-shell proton and neutron configurations. It is also the heaviest nucleus comprising protons and neutrons in equal numbers-a feature that enhances the contribution of the short-range proton-neutron pairing interaction and strongly influences its decay via the weak interaction. Decay studies in the region of Sn-100 have attempted to prove its doubly magic character(1) but few have studied it from an ab initio theoretical perspective(2,3), and none of these has addressed the odd-proton neighbours, which are inherently more difficult to describe but crucial for a complete test of nuclear forces. Here we present direct mass measurements of the exotic odd-proton nuclide In-100, the beta-decay daughter of Sn-100, and of In-99, with one proton less than Sn-100. We use advanced mass spectrometry techniques to measure In-99, which is produced at a rate of only a few ions per second, and to resolve the ground and isomeric states in In-101. The experimental results are compared with ab initio many-body calculations. The 100-fold improvement in precision of the In-100 mass value highlights a discrepancy in the atomic-mass values of Sn-100 deduced from recent beta-decay results(4,5).
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