1. Observation of a mu s isomer in In-134(49)85: Proton-neutron coupling >southeast> of Sn-132(50)82
- Author
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Phong, VH, Lorusso, G, Davinson, T, Estrade, A, Hall, O, Liu, J, Matsui, K, Montes, F, Nishimura, S, Boso, A, Regan, PH, Shearman, R, Xu, ZY, Agramunt, J, Allmond, JM, Ahn, DS, Algora, A, Baba, H, Brewer, NT, Bruno, CG, Caballero-Folch, R, Calvino, F, Wolinska-Cichocka, M, Cortes, G, Dillmann, I, Domingo-Pardo, C, Gargano, A, Go, S, Griffin, CJ, Grzywacz, RK, Harkness-Brennan, L, Isobe, T, Jungclaus, A, Kahl, D, Khiem, LH, Kiss, G, Korgul, A, Kubono, S, Miernik, K, Morales, AI, Nepal, N, Piersa, M, Podolyak, Zs, Rasco, BC, Rykaczewski, KP, Sakurai, H, Shimizu, Y, Stacener, DW, Sumikama, T, Suzuki, H, Takeda, H, Tain, JL, Tarifeno-Saldivia, A, Tolosa-Delgado, A, Vaquero, V, Woods, PJ, Yokoyama, R, Yuan, C, RIKEN Nishina Center for Accelerator-Based Science, University of Tokyo, Department of Energy (US), National Nuclear Security Administration (US), National Science Foundation (US), University of Michigan, National Science Centre (Poland), Science and Technology Facilities Council (UK), Ministry of Human Capacities (Hungary), Ministerio de Ciencia, Innovación y Universidades (España), Ministerio de Economía y Competitividad (España), European Commission, National Research Foundation (South Africa), Natural Sciences and Engineering Research Council of Canada, National Research Council of Canada, Department for Business, Energy and Industrial Strategy (UK), National Natural Science Foundation of China, and Vietnam Academy of Science and Technology
- Abstract
6 pags., 4 figs., 1 tab., We report on the observation of a microsecond isomeric state in the single-proton-hole, three-neutron-particle nucleus In-134. The nuclei of interest were produced by in-flight fission of a U-238 beam at the Radioactive Isotope Beam Factory at RIKEN. The isomer depopulates through a gamma ray of energy 56.7(1) keV and with a half-life of T-1/2 = 3.5(4) mu s. Based on the comparison with shell-model calculations, we interpret the isomer as the I-pi = 5(-) member of the pi 0g(9/2)(-1) circle times nu 1f(7/2)(3) multiplet, decaying to the I-pi = 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 I-pi = 5(-) isomer decay in In-132, provides a benchmark of the proton-neutron interaction in the region of the nuclear chart >southeast> of Sn-132, where experimental information on excited states is sparse., This experiment was performed at RI Beam Factory operated by RIKEN Nishina Center and CNS, University of Tokyo. This research was sponsored in part by the Office of Nuclear Physics, U.S. Department of Energy under Awards No. DE-FG02-96ER40983 (UTK) and No. DE-AC05- 00OR22725 (ORNL), and by the National Nuclear Security Administration under the Stewardship Science Academic Alliances program through DOE Award No. DE-NA0002132, by the National Science Foundation under Grants No. PHY1430152 (JINA Center for the Evolution of the Elements), No. PHY-1565546 (NSCL), and No. PHY1714153 (Central Michigan University), by the Polish National Science Center under Contract No. UMO-2015/18/E/ST2/00217, by JSPS KAKENHI (Grants No. 14F04808, No. 17H06090, No. 25247045, and No. 19340074), by the UK Science and Technology Facilities Council ST/P005314/1, by NKFIH (NN128072), by the Janos Bolyai research fellowship of the Hungarian Academy of Sciences, by the UNKP-18- 4-DE-449 New National Excellence Program of the Ministry of Human Capacities of Hungary, by Spanish Ministerio de Economia y Competitividad grants (FPA2017- 83946-C2-1-P, FPA2011-28770-C03-03, FPA2014-52823- C2-1-P, FPA2014-52823-C2-2-P, FPA2014-57196-C5-4-P, FPA2017-84756-C4-2-P, SEV-2014-0398, and IJCI-2014- 19172), by European Commission FP7/EURATOM Contract No. 605203, by the UK Nuclear Data Network funded by the UK Science and Technology Facilities Council Grant No. ST/N00244X/1, by the National Research Foundation (NRF) in South Korea (Grants No. 2016K1A3A7A09005575 and No. 2015H1A2A1030275), and by the Natural Sciences and Engineering Research Council of Canada (NSERC) via the Discovery Grants No. SAPIN-2014-00028 and No. RGPAS 462257-2014. TRIUMF receives federal funding via a contribution agreement with the National Research Council of Canada. N.P.L. receives funding from the UK Department of Business Energy and Industrial Strategy (BEIS) via the NMS program. Shell-model calculations are supported by the National Natural Science Foundation of China 11775316. L.H.K. acknowledges Vietnam Academy of Science and Technology for support under the Program of Development in the Field of Physics by 2020–Study of unstable nuclei beam induced nuclear reaction at RIKEN. V.H.P. would like to express his deep gratitude to the RIKEN institute for the support during the term of IPA program at RIKEN Nishina Center.
- Published
- 2019