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

Patel, Z, Walker, Philip, Podolyak, Zsolt, Regan, Patrick, Berry, Thomas, Söderström, P-A, Watanabe, H, Ideguchi, E, Simpson, GS, Nishimura, S , Wu, Q, Xu, FR, Browne, F, Doornenbal, P, Lorusso, G, Rice, S, Sinclair, L, Sumikama, T, Wu, J, Xu, ZY, Aoi, N, Baba, H, Bello Garrote, FL, Benzoni, G, Daido, R, Dombrádi, Zs, Fang, Y, Fukuda, N, Gey, G, Go, S, Gottardo, A, Inabe, N, Isobe, T, Kameda, D, Kobayashi, K, Kobayashi, M, Komatsubara, T, Kojouharov, I, Kubo, T, Kurz, N, Kuti, I, Li, Z, Matsushita, M, Michimasa, S, Moon, C-B, Nishibata, H, Nishizuka, I, Odahara, A, Sahin, E, Sakurai, H, Schaffner, H, Suzuki, H, Takeda, H, Tanaka, M, Taprogge, J, Vajta, Zs, Yagi, A and Yokoyama, R (2017) Isomer-delayed -ray spectroscopy of A = 159 - 164 midshell nuclei and the variation of K-forbidden E1 transition hindrance factors Physical Review C, 96 (3), 034305.

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Excited states have been studied in \iso{159}{Sm}, \iso{161}{Sm}, \iso{162}{Sm} (Z~=~62), \iso{163}{Eu} (Z~=~63), and \iso{164}{Gd} (Z~=~64), populated by isomeric decay following 238U projectile fission at RIBF, RIKEN. The isomer half-lives range from 50 ns to 2.6 \mus. In comparison with other published data, revised interpretations are proposed for \iso{159}{Sm} and \iso{163}{Eu}. The first data for excited states in \iso{161}{Sm} are presented, where a 2.6 \mus isomer is assigned a three-quasiparticle, K^\pi = 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 163Sm, 164Eu and 165Eu.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
Patel, Z
Söderström, P-A
Watanabe, H
Ideguchi, E
Simpson, GS
Nishimura, S
Wu, Q
Xu, FR
Browne, F
Doornenbal, P
Lorusso, G
Rice, S
Sinclair, L
Sumikama, T
Wu, J
Xu, ZY
Aoi, N
Baba, H
Bello Garrote, FL
Benzoni, G
Daido, R
Dombrádi, Zs
Fang, Y
Fukuda, N
Gey, G
Go, S
Gottardo, A
Inabe, N
Isobe, T
Kameda, D
Kobayashi, K
Kobayashi, M
Komatsubara, T
Kojouharov, I
Kubo, T
Kurz, N
Kuti, I
Li, Z
Matsushita, M
Michimasa, S
Moon, C-B
Nishibata, H
Nishizuka, I
Odahara, A
Sahin, E
Sakurai, H
Schaffner, H
Suzuki, H
Takeda, H
Tanaka, M
Taprogge, J
Vajta, Zs
Yagi, A
Yokoyama, R
Date : 6 September 2017
DOI : 10.1103/PhysRevC.96.034305
Copyright Disclaimer : Copyright 2017 American Physical Society
Depositing User : Melanie Hughes
Date Deposited : 16 Aug 2017 08:46
Last Modified : 16 Jan 2019 18:55

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