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Observation of a μs isomer in ¹³⁴₄₉In₈₅ : Proton-neutron coupling "southeast" of ¹³²₅₀Sn₈₂

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., Bruno, C. G., Caballero-Folch, R., Calvino, F., Wolińska-Cichocka, M., Cortes, G., Dillmann, I., Domingo-Pardo, C., Gargano, A., Go, S., Griffin, C. J., Grzywacz, R. K., Harkness-Brennan, L., Isobe, T., Jungclaus, A., Kahl, D., Khiem, L. H., Kiss, G., Korgul, A., Kubono, S., Miernik, K., Morales, A. I., Nepal, N., Piersa, M., Podolyak, Zs., Rasco, B. C., Rykaczewski, K. P., Sakurai, H., Shimizu, Y., Stacener, D. W., Sumikama, T., Suzuki, H., Takeda, H., Tain, J. L., Tarifeño-Saldivia, A., Tolosa-Delgado, A., Vaquero, V., Woods, P. J., Yokoyama, R. and Yuan, C. (2019) Observation of a μs isomer in ¹³⁴₄₉In₈₅ : Proton-neutron coupling "southeast" of ¹³²₅₀Sn₈₂ Physical Review C, 100, 011302(R). 011302-1.

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We report on the observation of a microsecond isomeric state in the single-proton-hole, three-neutron-particle nucleus ¹³⁴In. The nuclei of interest were produced by in-flight fission of a ²³⁸U 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 π0g−19/2⊗ν1f37/2 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 ¹³²In, provides a benchmark of the proton-neutron interaction in the region of the nuclear chart “southeast” of ¹³²Sn, where experimental information on excited states is sparse.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
Phong, V. H.
Lorusso, G.
Davinson, T.
Estrade, A.
Hall, O.
Liu, J.
Matsui, K.
Montes, F.
Nishimura, S.
Boso, A.
Regan, P.
Shearman, R.
Xu, Z. Y.
Agramunt, J.
Allmond, J. M.
Ahn, D. S.
Algora, A.
Baba, H.
Brewer, N. T.
Bruno, C. G.
Caballero-Folch, R.
Calvino, F.
Wolińska-Cichocka, M.
Cortes, G.
Dillmann, I.
Domingo-Pardo, C.
Gargano, A.
Go, S.
Griffin, C. J.
Grzywacz, R. K.
Harkness-Brennan, L.
Isobe, T.
Jungclaus, A.
Kahl, D.
Khiem, L. H.
Kiss, G.
Korgul, A.
Kubono, S.
Miernik, K.
Morales, A. I.
Nepal, N.
Piersa, M.
Rasco, B. C.
Rykaczewski, K. P.
Sakurai, H.
Shimizu, Y.
Stacener, D. W.
Sumikama, T.
Suzuki, H.
Takeda, H.
Tain, J. L.
Tarifeño-Saldivia, A.
Tolosa-Delgado, A.
Vaquero, V.
Woods, P. J.
Yokoyama, R.
Yuan, C.
Date : 29 July 2019
Funders : Science and Technology Facilities Council (STFC), European Commission 7th Framework Programme, Department of Business Energy and Industrial Strategy (BEIS)
DOI : 10.1103/PhysRevC.100.011302
Copyright Disclaimer : ©2019 American Physical Society.
Depositing User : Clive Harris
Date Deposited : 16 Aug 2019 09:53
Last Modified : 16 Aug 2019 09:53

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