2021年12月10日
Impact of shell evolution on Gamow-Teller β decay from a high-spin long-lived isomer in 127Ag
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
- 巻
- 823
- 号
- 記述言語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1016/j.physletb.2021.136766
The change of the shell structure in atomic nuclei, so-called “nuclear shell evolution”, occurs due to changes of major configurations through particle-hole excitations inside one nucleus, as well as due to variation of the number of constituent protons or neutrons. We have investigated how the shell evolution affects Gamow-Teller (GT) transitions that dominate the β decay in the region below 132Sn using the newly obtained experimental data on a long-lived isomer in 127Ag. The T1/2=67.5(9) ms isomer has been identified with a spin and parity of (27/2+) at an excitation energy of 1942−20+14 keV, and found to decay via an internal transition of an E3 character, which competes with the dominant β-decay branches towards the high-spin states in 127Cd. The underlying mechanism of a strong GT transition from the 127Ag isomer is discussed in terms of configuration-dependent optimization of the effective single-particle energies in the framework of a shell-model approach.
- リンク情報
- ID情報
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- DOI : 10.1016/j.physletb.2021.136766
- ISSN : 0370-2693
- SCOPUS ID : 85118836523