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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.

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Abstract

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 :
NameEmailORCID
Patel, ZUNSPECIFIEDUNSPECIFIED
Walker, PhilipP.Walker@surrey.ac.ukUNSPECIFIED
Podolyak, ZsoltZ.Podolyak@surrey.ac.ukUNSPECIFIED
Regan, PatrickP.Regan@surrey.ac.ukUNSPECIFIED
Berry, Thomast.berry@surrey.ac.ukUNSPECIFIED
Söderström, P-AUNSPECIFIEDUNSPECIFIED
Watanabe, HUNSPECIFIEDUNSPECIFIED
Ideguchi, EUNSPECIFIEDUNSPECIFIED
Simpson, GSUNSPECIFIEDUNSPECIFIED
Nishimura, SUNSPECIFIEDUNSPECIFIED
Wu, QUNSPECIFIEDUNSPECIFIED
Xu, FRUNSPECIFIEDUNSPECIFIED
Browne, FUNSPECIFIEDUNSPECIFIED
Doornenbal, PUNSPECIFIEDUNSPECIFIED
Lorusso, GUNSPECIFIEDUNSPECIFIED
Rice, SUNSPECIFIEDUNSPECIFIED
Sinclair, LUNSPECIFIEDUNSPECIFIED
Sumikama, TUNSPECIFIEDUNSPECIFIED
Wu, JUNSPECIFIEDUNSPECIFIED
Xu, ZYUNSPECIFIEDUNSPECIFIED
Aoi, NUNSPECIFIEDUNSPECIFIED
Baba, HUNSPECIFIEDUNSPECIFIED
Bello Garrote, FLUNSPECIFIEDUNSPECIFIED
Benzoni, GUNSPECIFIEDUNSPECIFIED
Daido, RUNSPECIFIEDUNSPECIFIED
Dombrádi, ZsUNSPECIFIEDUNSPECIFIED
Fang, YUNSPECIFIEDUNSPECIFIED
Fukuda, NUNSPECIFIEDUNSPECIFIED
Gey, GUNSPECIFIEDUNSPECIFIED
Go, SUNSPECIFIEDUNSPECIFIED
Gottardo, AUNSPECIFIEDUNSPECIFIED
Inabe, NUNSPECIFIEDUNSPECIFIED
Isobe, TUNSPECIFIEDUNSPECIFIED
Kameda, DUNSPECIFIEDUNSPECIFIED
Kobayashi, KUNSPECIFIEDUNSPECIFIED
Kobayashi, MUNSPECIFIEDUNSPECIFIED
Komatsubara, TUNSPECIFIEDUNSPECIFIED
Kojouharov, IUNSPECIFIEDUNSPECIFIED
Kubo, TUNSPECIFIEDUNSPECIFIED
Kurz, NUNSPECIFIEDUNSPECIFIED
Kuti, IUNSPECIFIEDUNSPECIFIED
Li, ZUNSPECIFIEDUNSPECIFIED
Matsushita, MUNSPECIFIEDUNSPECIFIED
Michimasa, SUNSPECIFIEDUNSPECIFIED
Moon, C-BUNSPECIFIEDUNSPECIFIED
Nishibata, HUNSPECIFIEDUNSPECIFIED
Nishizuka, IUNSPECIFIEDUNSPECIFIED
Odahara, AUNSPECIFIEDUNSPECIFIED
Sahin, EUNSPECIFIEDUNSPECIFIED
Sakurai, HUNSPECIFIEDUNSPECIFIED
Schaffner, HUNSPECIFIEDUNSPECIFIED
Suzuki, HUNSPECIFIEDUNSPECIFIED
Takeda, HUNSPECIFIEDUNSPECIFIED
Tanaka, MUNSPECIFIEDUNSPECIFIED
Taprogge, JUNSPECIFIEDUNSPECIFIED
Vajta, ZsUNSPECIFIEDUNSPECIFIED
Yagi, AUNSPECIFIEDUNSPECIFIED
Yokoyama, RUNSPECIFIEDUNSPECIFIED
Date : 16 November 2017
Copyright Disclaimer : Copyright 2017 American Physical Society
Depositing User : Melanie Hughes
Date Deposited : 16 Aug 2017 08:46
Last Modified : 16 Aug 2017 08:46
URI: http://epubs.surrey.ac.uk/id/eprint/841939

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