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Shape coexistence near the double-midshell nucleus 111Rh |
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| Authors: | G Lhersonneau B Pfeiffer J Alstad P Dendooven K Eberhardt S Hankonen I Klöckl K-L Kratz A Nähler R Malmbeck JP Omtvedt H Penttilä S Schoedder G Skarnemark N Trautmann J Äystö |
| Institution: | Department of Physics, University of Jyv?skyl?, P.O.Box. 35, FIN-40351, Jyv?skyl?, Finland, FI Institut für Kernchemie, Universit?t Mainz, Fritz-Strassmann-Weg 2, D-55128 Mainz, Germany, DE Department of Chemistry, University of Oslo, N-0315 Oslo, Norway, NO Department of Nuclear Chemistry, Chalmers University of Technology, S-41296 G?teborg, Sweden, SE |
| Abstract: | The decay of 111Ru obtained from fast on-line chemical and mass separation has been investigated by β-γ-t and γ-γ coincidence techniques. Earlier spin and parity assignments of 111Rh levels based on extrapolations of level systematics are confirmed. In particular, the K=1/2 intruder band is supported by the hindrance of E2 transitions between deformed and spherical states and enhancement of intraband E2 transitions. The excitation energies of intruder band members in Rh isotopes show a minimum at 109Rh64, with two neutrons less than 111Rh at the N=66 midshell. This trend, which differs from the one in the higher-Z neighbouring elements Ag and Cd with minima at N=66, follows the evolution of deformation observed in the lower-Z elements Ru and Mo. Received: 25 June 1997 / Revised version: 10 September 1997 |
| Keywords: | PACS:27 60 +j 90 ≤ A ≤ 149 – 21 10 Tg Lifetimes – 23 20 Lv Gamma transitions and level energies |
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