New isomers in 125 Pd 79 and 127 Pd 81: Competing proton and neutron excitations in neutron-rich palladium nuclides towards the N = 82 shell closure

H. Watanabe, H. K. Wang, G. Lorusso, S. Nishimura, Z. Y. Xu, T. Sumikama, P. A. Söderström, P. Doornenbal, F. Browne, G. Gey, H. S. Jung, J. Taprogge, Zs Vajta, J. Wu, A. Yagi, H. Baba, G. Benzoni, K. Y. Chae, F. C.L. Crespi, N. FukudaR. Gernhäuser, N. Inabe, T. Isobe, A. Jungclaus, D. Kameda, G. D. Kim, Y. K. Kim, I. Kojouharov, F. G. Kondev, T. Kubo, N. Kurz, Y. K. Kwon, G. J. Lane, Z. Li, C. B. Moon, A. Montaner-Pizá, K. Moschner, F. Naqvi, M. Niikura, H. Nishibata, D. Nishimura, A. Odahara, R. Orlandi, Z. Patel, Zs Podolyák, H. Sakurai, H. Schaffner, G. S. Simpson, K. Steiger, Y. Sun, H. Suzuki, H. Takeda, A. Wendt, K. Yoshinaga

Research output: Contribution to journalArticle

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 125 Pd 79 and 127 Pd 81 studied using the EURICA γ-ray spectrometer, following production via in-flight fission of a high-intensity 238 U 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 125 Pd and 127 Pd, 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 132 Sn.

Original languageEnglish
Pages (from-to)263-268
Number of pages6
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume792
DOIs
Publication statusPublished - May 10 2019

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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    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, Z., Wu, J., Yagi, A., Baba, H., Benzoni, G., Chae, K. Y., Crespi, F. C. L., ... Yoshinaga, K. (2019). New isomers in 125 Pd 79 and 127 Pd 81: Competing proton and neutron excitations in neutron-rich palladium nuclides towards the N = 82 shell closure. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 792, 263-268. https://doi.org/10.1016/j.physletb.2019.03.053