TY  - JOUR
AU  - Watanabe, H. et al
AU  - Montaner-Piza, A.
PY  - 2021
DA  - 2021//
TI  - Impact of shell evolution on Gamow-Teller beta decay from a high-spin long-lived isomer in Ag-127
T2  - Phys. Lett. B
JO  - Physics Letters B
SP  - 136766
EP  - 6pp
VL  - 823
PB  - Elsevier
KW  - Shell evolution
KW  - Gamow-Teller beta decay
KW  - Isomer
KW  - Ag-127
KW  - Radioactive isotope beam
AB  - 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.
SN  - 0370-2693
UR  - https://doi.org/10.1016/j.physletb.2021.136766
DO  - 10.1016/j.physletb.2021.136766
LA  - English
N1  - WOS:000719296400003
ID  - Watanabe+Montaner-Piza2021
ER  -