Various nuclear structures in Xe 140 studied by β decay of ground and isomeric states in i 140

A. Yagi, A. Odahara, H. Nishibata, R. Lozeva, C. B. Moon, S. Nishimura, K. Yoshida, N. Yoshinaga, C. Watanabe, K. Higashiyama, T. Shimoda, R. Daido, Y. Fang, P. S. Lee, B. Moon, P. Doornenbal, G. Lorusso, P. A. Söderström, T. Sumikama, H. WatanabeT. Isobe, H. Baba, H. Sakurai, F. Browne, Z. Patel, S. Rice, L. Sinclair, J. Wu, Z. Y. Xu, R. Yokoyama, T. Kubo, N. Inabe, H. Suzuki, N. Fukuda, D. Kameda, H. Takeda, D. S. Ahn, Y. Shimizu, D. Murai, F. L. Bello Garrote, J. M. Daugas, F. Didierjean, E. Ideguchi, S. Iimura, T. Ishigaki, H. S. Jung, T. Komatsubara, Y. K. Kwon, C. S. Lee, S. Morimoto, M. Niikura, I. Nishizuka, K. Tshoo

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Structure of the neutron-rich N=86 isotope 140Xe, located northeast of a doubly-magic nucleus 132Sn, is investigated by β-γ spectroscopy. Two β-decay isomers in I140 are newly found in the study of two different β decays of I140 which were produced by two reactions (i) direct in-flight fission at a primary target and (ii) β decay of Te140 at an active stopper. Half-lives of the β decays of the ground state, the low-spin isomer, and the high-spin isomer are determined to be 0.38(2), 0.91(5), and 0.47(4) s, respectively. Decay schemes of the β decay of the high-spin isomer and of the mixed β decays of the ground state and the low-spin isomer in I140 to Xe140 are constructed using the information on γ-ray coincidence relation and γ-ray intensity. Nuclear structures of the low-lying states in Xe140 and I140 are discussed by comparing the experimental results to two theoretical calculations based on a large-scale shell model and the deformed Skyrme Hartree-Fock-Bogoliubov plus deformed quasiparticle-random-phase approximation. Possible candidates for (quasi-)γ-band members of 2+ and 4+ states and the octupole collective 1-state are proposed in Xe140. Increase of quadrupole, triaxial, and octupole collectivities is discussed with the increase of neutron and proton numbers.

Original languageEnglish
Article number044325
JournalPhysical Review C
Issue number4
Publication statusPublished - Apr 2022

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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