Identification of a 6.6μs isomeric state in Ir175

S.A. Gillespie, A.N. Andreyev, M. Al Monthery, C.J. Barton, S. Antalic, K. Auranen, H. Badran, D. Cox, J.G. Cubiss, D. O'Donnell, T. Grahn, P.T. Greenlees, A. Herzan, E. Higgins, R. Julin, S. Juutinen, J. Klimo, J. Konki, M. Leino, M. MallaburnJ. Pakarinen, P. Papadakis, J. Partanen, P.M. Prajapati, P. Rahkila, M. Sandzelius, C. Scholey, J. Sorri, S. Stolze, R. Urban, J. Uusitalo, M. Venhart, F. Weaving

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Abstract

An experiment has been performed to study excited states in the neutron-deficient nucleus 175Ir via the use of the JUROGAM II high-purity germanium detector array and the RITU gas-filled separator at JYFL, Jyväskylä. By using isomer tagging, an isomeric state with a half-life of 6.58(15) μs has been observed in 175Ir for the first time. It has been established that the isomer decays via a 45.2 (E1)–26.1 (M1) keV cascade to new states below the previously reported ground state in 175Ir with Iπ=(5/2−). We now reassign this (5/2−) state to the isomeric state discovered in this study.
Original languageEnglish
Pages (from-to)064310
Number of pages6
JournalPhysical Review C
Volume99
Issue number6
DOIs
Publication statusPublished - 7 Jun 2019

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Gillespie, S. A., Andreyev, A. N., Monthery, M. A., Barton, C. J., Antalic, S., Auranen, K., Badran, H., Cox, D., Cubiss, J. G., O'Donnell, D., Grahn, T., Greenlees, P. T., Herzan, A., Higgins, E., Julin, R., Juutinen, S., Klimo, J., Konki, J., Leino, M., ... Weaving, F. (2019). Identification of a 6.6μs isomeric state in Ir175. Physical Review C, 99(6), 064310. https://doi.org/10.1103/PhysRevC.99.064310