Identification of a 6.6s isomeric state in Ir

Irにおける6.6マイクロ秒核異性体の同定

Gillespie, S. A.*; Andreyev, A. N.; Al Monthery, M.*; 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.*; Mallaburn, M.*; Pakarinen, J.*; Papadakis, P.*; Partanena, J.*; Prajapati, P. M.*; Rahkila, P.*; Sandzelius, M.*; Scholey, C.*; Sorri, J.*; Stolze, S.*; Urban, R.*; Uusitalo, J.*; Venhart, M.*; Weaving, F.*

Gillespie, S. A.*; Andreyev, A. N.; Al Monthery, M.*; 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.*; Mallaburn, M.*; Pakarinen, J.*; Papadakis, P.*; Partanena, J.*; Prajapati, P. M.*; Rahkila, P.*; Sandzelius, M.*; Scholey, C.*; Sorri, J.*; Stolze, S.*; Urban, R.*; Uusitalo, J.*; Venhart, M.*; Weaving, F.*

An experiment has been performed to study excited states in the neutron-deficient nucleus Ir via the use of the JUROGAM II high-purity germanium detector array and the RITU gas-filled separator at JYFL, Jyvskyl. By using isomer tagging, an isomeric state with a half-life of 6.58(15) s has been observed in Ir for the first time. It has been established that the isomer decays via a 45.2 () - 26.1 () keV cascade to new states below the previously reported ground state in Ir with . We now reassign this state to the isomeric state discovered in this study.