Submicrosecond isomer in 117Rh and the role of triaxiality in its electromagnetic decay rate

S. Lalkovski, Alison Bruce, Ana M. Denis Bacelar, M. Gorska, S. Pietri, Z. Podolyák, P. Bednarczyk, L. Cáceres, E. Casarejos, I.J. Cullen, P. Doornenbal, G.F. Farrelly, A.B. Garnsworthy, H. Geissel, W. Gelletly, J. Gerl, J. Grebosz, C. Hinke, G. Ilie, D. IvanovaG. Jaworski, S. Kisyov, I. Kojouharov, N. Kurz, N. Minkov, S. Myalski, M. Palacz, P. Petkov, W. Prokopowicz, P.H. Regan, H. Schaffner, S.J. Steer, S. Tashenov, P.M. Walker, H.J. Wollersheim

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The neutron-rich nucleus 117Rh was synthesized in the fission of a relativistic 238U beam produced at the GSI laboratory in Darmstadt, Germany. An isomeric state with t1/2=138(17) ns decaying by a single γ ray was observed, providing the first information on the excited states in this nucleus. The experimental data are discussed in terms of systematics and interpreted by using the Woods-Saxon deformed shell model and triaxial-rotor-plus-particle calculations. The origin of the isomer is explained as being due to a hindered E2 transition to the ground state.
Original languageEnglish
JournalPhysical Review C
Issue number2
Publication statusPublished - 2 Aug 2013


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