학술논문
Impact of shell evolution on Gamow-Teller β decay from a high-spin long-lived isomer in 127Ag
Document Type
article
Author
H. Watanabe; C.X. Yuan; G. Lorusso; S. Nishimura; Z.Y. Xu; T. Sumikama; P.-A. Söderström; P. Doornenbal; F. Browne; G. Gey; H.S. Jung; J. Taprogge; Zs. Vajta; H.K. Wang; J. Wu; A. Yagi; H. Baba; G. Benzoni; K.Y. Chae; F.C.L. Crespi; N. Fukuda; R. Gernhäuser; N. Inabe; T. Isobe; A. Jungclaus; D. Kameda; G.D. Kim; Y.K. Kim; I. Kojouharov; F.G. Kondev; T. Kubo; N. Kurz; Y.K. Kwon; G.J. Lane; Z. Li; C.-B. Moon; A. Montaner-Pizá; K. Moschner; F. Naqvi; M. Niikura; H. Nishibata; D. Nishimura; A. Odahara; R. Orlandi; Z. Patel; Zs. Podolyák; H. Sakurai; H. Schaffner; G.S. Simpson; K. Steiger; H. Suzuki; H. Takeda; A. Wendt; K. Yoshinaga
Source
Physics Letters B, Vol 823, Iss , Pp 136766- (2021)
Subject
Language
English
ISSN
0370-2693
Abstract
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.