%0 Journal Article
%T Impact of shell evolution on Gamow-Teller beta decay from a high-spin long-lived isomer in Ag-127
%A Watanabe, H. et al
%A Montaner-Piza, A.
%J Physics Letters B
%D 2021
%V 823
%I Elsevier
%@ 0370-2693
%G English
%F Watanabe+Montaner-Piza2021
%O WOS:000719296400003
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=5041), last updated on Mon, 13 Dec 2021 08:51:10 +0000
%X 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.
%K Shell evolution
%K Gamow-Teller beta decay
%K Isomer
%K Ag-127
%K Radioactive isotope beam
%R 10.1016/j.physletb.2021.136766
%U https://doi.org/10.1016/j.physletb.2021.136766
%P 136766-6pp