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New isomers in 125Pd79 and 127Pd81: Competing proton and neutron excitations in neutron-rich palladium nuclides towards the N = 82 shell closure

Watanabe, H., Wang, H.K., Lorusso, G., Nishimura, S., Xu, Z.Y., Sumikama, T., Söderström, P.-A., Doornenbal, P., Browne, F., Gey, G. , Jung, H.S., Taprogge, J., Vajta, Zs., Wu, J., Yagi, A., Baba, H., Benzoni, G., Chae, K.Y., Crespi, F.C.L., Fukuda, N., Gernhäuser, R., Inabe, N., Isobe, T., Jungclaus, A., Kameda, D., Kim, G.D., Kim, Y.K., Kojouharov, I., Kondev, F.G., Kubo, T., Kurz, N., Kwon, Y.K., Lane, G.J., Li, Z., Moon, C.-B., Montaner-Pizá, A., Moschner, K., Naqvi, F., Niikura, M., Nishibata, H., Nishimura, D., Odahara, A., Orlandi, R., Patel, Z., Podolyak, Zs., Sakurai, H., Schaffner, H., Simpson, G.S., Steiger, K., Sun, Y., Suzuki, H., Takeda, H., Wendt, A. and Yoshinaga, K. (2019) New isomers in 125Pd79 and 127Pd81: Competing proton and neutron excitations in neutron-rich palladium nuclides towards the N = 82 shell closure Physics Letters B, 792. pp. 263-268.

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Abstract

The neutron-rich isotopes of palladium have attracted considerable interest in terms of the evolution of the N = 82 neutron shell closure and its influence on the r-process nucleosynthesis. In this Letter, we present the first spectroscopic information on the excited states in 125Pd79 and 127Pd81 studied using the EURICA γ-ray spectrometer, following production via in-flight fission of a high-intensity 238U beam at the RIBF facility. New isomeric states with half-lives of 144(4) ns and 39(6) μs have been assigned spins and parities of (23/2+) and (19/2+) in 125Pd and 127Pd, respectively. The observed level properties are compared to a shell-model calculation, suggesting the competition between proton excitations and neutron excitations in the proton-hole and neutron-hole systems in the vicinity of the doubly magic nucleus 132Sn.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Watanabe, H.
Wang, H.K.
Lorusso, G.
Nishimura, S.
Xu, Z.Y.
Sumikama, T.
Söderström, P.-A.
Doornenbal, P.
Browne, F.
Gey, G.
Jung, H.S.
Taprogge, J.
Vajta, Zs.
Wu, J.
Yagi, A.
Baba, H.
Benzoni, G.
Chae, K.Y.
Crespi, F.C.L.
Fukuda, N.
Gernhäuser, R.
Inabe, N.
Isobe, T.
Jungclaus, A.
Kameda, D.
Kim, G.D.
Kim, Y.K.
Kojouharov, I.
Kondev, F.G.
Kubo, T.
Kurz, N.
Kwon, Y.K.
Lane, G.J.
Li, Z.
Moon, C.-B.
Montaner-Pizá, A.
Moschner, K.
Naqvi, F.
Niikura, M.
Nishibata, H.
Nishimura, D.
Odahara, A.
Orlandi, R.
Patel, Z.
Podolyak, Zs.Z.Podolyak@surrey.ac.uk
Sakurai, H.
Schaffner, H.
Simpson, G.S.
Steiger, K.
Sun, Y.
Suzuki, H.
Takeda, H.
Wendt, A.
Yoshinaga, K.
Date : 10 May 2019
DOI : 10.1016/j.physletb.2019.03.053
Copyright Disclaimer : © 2019 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Depositing User : Clive Harris
Date Deposited : 16 Apr 2019 08:00
Last Modified : 20 Aug 2019 15:31
URI: http://epubs.surrey.ac.uk/id/eprint/851167

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