Journal
PHYSICS LETTERS B
Volume 823, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2021.136766
Keywords
Shell evolution; Gamow-Teller beta decay; Isomer; Ag-127; Radioactive isotope beam
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This study investigates the impact of nuclear shell evolution on Gamow-Teller transitions, focusing on the experimental data of a long-lived isomer in Ag-127, which decays through internal transitions competing with high-spin states in Cd-127. The strong GT transition from the Ag-127 isomer is discussed in terms of configuration-dependent optimization of effective single-particle energies.
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 beta decay in the region below Sn-132 using the newly obtained experimental data on a long-lived isomer in Ag-127. The T-1/2 = 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 beta-decay branches towards the high-spin states in Cd-127. The underlying mechanism of a strong GT transition from the Ag-127 isomer is discussed in terms of configuration-dependent optimization of the effective single-particle energies in the framework of a shell-model approach. (C) 2021 The Authors. Published by Elsevier B.V.
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