Eur. Phys. J. A 14, 13-16 (2002)
Signature inversion in the yrare band ofC.-B. Moon1, T. Komatsubara2, Y. Sasaki2, T. Jumatsu2, K. Yamada2, K. Satou2 and K. Furuno2
1 Department of Physics, Hoseo University, Chung-Nam 336-795, Korea
2 Institute of Physics and Tandem Accelerator Center, University of Tsukuba, Ibaraki 305-8577, Japan
(Received: 8 January 2002 / Revised version: 18 April 2002 Communicated by D. Schwalm)
Excited states of the nucleus have been studied by using in-beam -ray spectroscopy with the ( , p3n) fusion-evaporation reaction at a beam energy of 85 MeV. The level scheme of has been derived from - coincidence and - angular correlation analyses. We have, for the first time, established the second negative-parity favored and unfavored states built on the 11/2 - state, namely the yrare rotational bands in . In contrast to the behavior of the yrast bands where the favored states are lying lower in energy, the yrare favored states were observed to lie above the unfavored band. Such a signature inversion in is changed to be normal at .
21.10.Re - Collective levels.
23.20.Lv - Gamma transitions and level energies.
27.60.+j - .
© Società Italiana di Fisica, Springer-Verlag 2002