Journal
PHYSICS LETTERS B
Volume 802, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2020.135200
Keywords
Mass spectrometry; Multiple-reflection time-of-flight mass spectrometry; Nuclear structure; Isomers; Isomer-to-ground state ratio; Exotic nuclei
Funding
- German Federal Ministry for Education and Research (BMBF) [05P12RGFN8, 05P16RGFN1, 05P19RGFN1]
- Justus-Liebig-Universitat Giessen
- GSI under the JLU-GSI strategic Helmholtz
- HGS-HIRe
- Hessian Ministry for Science and Art (HMWK) through the LOEWE Center HICforFAIR
- Polish National Science Centre [2016/21/B/ST2/01227]
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Long-lived isomeric states in Ag-97 and In101-109 were investigated with the FRS Ion Catcher at GSI. In the isotope Ag-97, a long-lived (1/2(-)) isomeric state was discovered, and its excitation energy was determined to be 618(38) keV. This is simultaneously the first discovery of a nuclear isomeric state by multiple-reflection time-of-flight mass spectrometry. The measured excitation energies were compared to large-scale shell-model calculations, which indicated the importance of core excitation around Sn-100. Furthermore, advanced mean-field calculations for the Ag-97 nucleus and relevant neighboring nuclei were performed, which have contributed to a better understanding of the repetitive appearance of certain isomeric structures in neighboring nuclei, and which have supported the discovery of the isomeric state in Ag-97 in a global shell-evolution scheme. (C) 2020 The Author(s). Published by Elsevier B.V.
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