Observation of a μs isomer in In85 49134: Proton-neutron coupling "southeast" of Sn82 50132

V. H. Phong, G. Lorusso, T. Davinson, A. Estrade, O. Hall, J. Liu, K. Matsui, F. Montes, S. Nishimura, A. Boso, P. H. Regan, R. Shearman, Z. Y. Xu, J. Agramunt, J. M. Allmond, D. S. Ahn, A. Algora, H. Baba, N. T. Brewer, C. G. BrunoR. Caballero-Folch, F. Calvino, M. Wolińska-Cichocka, G. Cortes, I. Dillmann, C. Domingo-Pardo, A. Gargano, S. Go, C. J. Griffin, R. K. Grzywacz, L. Harkness-Brennan, T. Isobe, A. Jungclaus, D. Kahl, L. H. Khiem, G. Kiss, A. Korgul, S. Kubono, K. Miernik, A. I. Morales, N. Nepal, M. Piersa, Zs Podolyák, B. C. Rasco, K. P. Rykaczewski, H. Sakurai, Y. Shimizu, D. W. Stacener, T. Sumikama, H. Suzuki, H. Takeda, J. L. Tain, A. Tarifeño-Saldivia, A. Tolosa-Delgado, V. Vaquero, P. J. Woods, R. Yokoyama, C. Yuan

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Abstract

We report on the observation of a microsecond isomeric state in the single-proton-hole, three-neutron-particle nucleus In134. The nuclei of interest were produced by in-flight fission of a U238 beam at the Radioactive Isotope Beam Factory at RIKEN. The isomer depopulates through a γ ray of energy 56.7(1) keV and with a half-life of T1/2=3.5(4)μs. Based on the comparison with shell-model calculations, we interpret the isomer as the Iπ=5- member of the π0g9/2-1 - ν1f7/23 multiplet, decaying to the Iπ=7- ground state with a reduced-transition probability of B(E2;5-→7-)=0.53(6)W.u. Observation of this isomer, and lack of evidence in the current work for a Iπ=5- isomer decay in In132, provides a benchmark of the proton-neutron interaction in the region of the nuclear chart "southeast" of Sn132, where experimental information on excited states is sparse.

Original languageEnglish
Article number011302
JournalPhysical Review C
Volume100
Issue number1
DOIs
Publication statusPublished - Jul 29 2019

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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    Phong, V. H., Lorusso, G., Davinson, T., Estrade, A., Hall, O., Liu, J., Matsui, K., Montes, F., Nishimura, S., Boso, A., Regan, P. H., Shearman, R., Xu, Z. Y., Agramunt, J., Allmond, J. M., Ahn, D. S., Algora, A., Baba, H., Brewer, N. T., ... Yuan, C. (2019). Observation of a μs isomer in In85 49134: Proton-neutron coupling "southeast" of Sn82 50132. Physical Review C, 100(1), [011302]. https://doi.org/10.1103/PhysRevC.100.011302