Isomer-delayed γ -ray spectroscopy of A=159-164 midshell nuclei and the variation of K -forbidden E1 transition hindrance factors

Z. Patel, P. M. Walker, Zs Podolyák, P. H. Regan, T. A. Berry, P. A. Söderström, H. Watanabe, E. Ideguchi, G. S. Simpson, S. Nishimura, Q. Wu, F. R. Xu, F. Browne, P. Doornenbal, G. Lorusso, S. Rice, L. Sinclair, T. Sumikama, J. Wu, Z. Y. XuN. Aoi, H. Baba, F. L. Bello Garrote, G. Benzoni, R. Daido, Zs Dombrádi, Y. Fang, N. Fukuda, G. Gey, S. Go, A. Gottardo, N. Inabe, T. Isobe, D. Kameda, K. Kobayashi, M. Kobayashi, T. Komatsubara, I. Kojouharov, T. Kubo, N. Kurz, I. Kuti, Z. Li, M. Matsushita, S. Michimasa, C. B. Moon, H. Nishibata, I. Nishizuka, A. Odahara, E. Şahin, H. Sakurai, H. Schaffner, H. Suzuki, H. Takeda, M. Tanaka, J. Taprogge, Zs Vajta, A. Yagi, R. Yokoyama

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Abstract

Excited states have been studied in Sm159, Sm161, Sm162 (Z=62), Eu163 (Z=63), and Gd164 (Z=64), populated by isomeric decay following U238 projectile fission at RIBF, RIKEN. The isomer half-lives range from 50 ns to 2.6μs. In comparison with other published data, revised interpretations are proposed for Sm159 and Eu163. The first data for excited states in Sm161 are presented, where a 2.6-μs isomer is assigned a three-quasiparticle, Kπ=17/2- structure. The interpretation is supported by multi-quasiparticle Nilsson-BCS calculations, including the blocking of pairing correlations. A consistent set of reduced E1 hindrance factors is obtained. Limited evidence is also reported for isomeric decay in Sm163, Eu164, and Eu165.

Original languageEnglish
Article number034305
JournalPhysical Review C
Volume96
Issue number3
DOIs
Publication statusPublished - Sep 6 2017

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All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

Cite this

Patel, Z., Walker, P. M., Podolyák, Z., Regan, P. H., Berry, T. A., Söderström, P. A., ... Yokoyama, R. (2017). Isomer-delayed γ -ray spectroscopy of A=159-164 midshell nuclei and the variation of K -forbidden E1 transition hindrance factors. Physical Review C, 96(3), [034305]. https://doi.org/10.1103/PhysRevC.96.034305