학술논문
New isomers in 125Pd79 and 127Pd81: Competing proton and neutron excitations in neutron-rich palladium nuclides towards the N = 82 shell closure
Document Type
article
Author
H. Watanabe; H.K. Wang; 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; 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; Y. Sun; H. Suzuki; H. Takeda; A. Wendt; K. Yoshinaga
Source
Physics Letters B, Vol 792, Iss , Pp 263-268 (2019)
Subject
Language
English
ISSN
0370-2693
Abstract
The neutron-rich isotopes of palladium have attracted considerable interest in terms of the evolution of the N=82 neutron shell closure and its influence on the r-process nucleosynthesis. In this Letter, we present the first spectroscopic information on the excited states in 125Pd79 and 127Pd81 studied using the EURICA γ-ray spectrometer, following production via in-flight fission of a high-intensity 238U beam at the RIBF facility. New isomeric states with half-lives of 144(4) ns and 39(6) μs have been assigned spins and parities of (23/2+) and (19/2+) in 125Pd and 127Pd, respectively. The observed level properties are compared to a shell-model calculation, suggesting the competition between proton excitations and neutron excitations in the proton-hole and neutron-hole systems in the vicinity of the doubly magic nucleus 132Sn.