Isomer-delayed γ -ray spectroscopy of A = 159 – 164 midshell nuclei and the variation of K -forbidden E 1 transition hindrance factors
Year: 2017
Type: article
Abstract: Excited states have been studied in $^{159}\mathrm{Sm}, ^{161}\mathrm{Sm}, ^{162}\mathrm{Sm}$ ($Z=62$), $^{163}\mathrm{Eu}$ ($Z=63$), and $^{164}\mathrm{Gd}$ ($Z=64$), populated by isomeric decay following $^{238}\mathrm{U}$ projectile fission at RIBF, RIKEN. The isomer half-lives range from 50 ns to $2.6\phantom{\rule{0.16em}{0ex}}\ensuremath{\mu}\mathrm{s}$. In comparison with other published data, revised interpretations are proposed for $^{159}\mathrm{Sm}$ and $^{163}\mathrm{Eu}$. The first data for excited states in $^{161}\mathrm{Sm}$ are presented, where a 2.6-$\ensuremath{\mu}\mathrm{s}$ isomer is assigned a three-quasiparticle, ${K}^{\ensuremath{\pi}}=17/{2}^{\ensuremath{-}}$ 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 $^{163}\mathrm{Sm}, ^{164}\mathrm{Eu}$, and $^{165}\mathrm{Eu}$.
Source: Physical Review C
Authors: 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. Xu, N. 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
Institutions: University of Surrey, RIKEN Nishina Center, National Physical Laboratory, Beihang University, Research Center for Nuclear Physics, The University of Osaka, The University of Osaka, Institut polytechnique de Grenoble, Centre National de la Recherche Scientifique, Institut National de Physique Nucléaire et de Physique des Particules, Université Grenoble Alpes, Peking University, State Key Laboratory of Nuclear Physics and Technology, University of Brighton, University of York, Tohoku University, The University of Tokyo, University of Oslo, Istituto Nazionale di Fisica Nucleare, Sezione di Milano, HUN-REN Institute for Nuclear Research, Hungarian Academy of Sciences, Université Joseph Fourier, Laboratoire de Physique Subatomique et de Cosmologie, Center for Nuclear Study, The University of Tokyo, Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, Rikkyo University, GSI Helmholtz Centre for Heavy Ion Research, Hoseo University, Consejo Superior de Investigaciones Científicas, Instituto de Estructura de la Materia, Universidad Autónoma de Madrid
Language: Latvian
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2748830405