Eur. Phys. J. A 13, 429-433 (2002)
Rotational bands and signature inversion phenomena in and structures in odd-oddY.H. Zhang1, M. Oshima2, Y. Toh2, M. Koizumi2, A. Osa2, T. Shizuma2, T. Hayakawa2, M. Sugawara3, H. Kusakari4, T. Morikawa5, S.X. Wen6 and L.H. Zhu6
1 Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, PRC
2 Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki 319-1195, Japan
3 Chiba Institute of Technology, Narashino, Chiba 275-0023, Japan
4 Chiba University, Inage-ku, Chiba 263-8512, Japan
5 Department of Physics, Kyushu University, Fukuoka 812-81, Japan
6 China Institute of Atomic Energy, Beijing, 102413, PRC
(Received: 14 December 2001 / Revised version: 18 January 2002 Communicated by D. Schwalm)
High-spin states in have been investigated via the ( 31 P,4n ) reaction through excitation functions, X- and - coincidence measurements. Four rotational bands have been identified for the first time and their configurations are suggested on the basis of the existing knowledge of band structures in odd-odd nuclei as well as the measured in-band B(M1)/B(E2) ratios. Among the four bands observed, the and bands exhibit an anomalous signature splitting. The signature inversion point is observed in the former at which is consistent with expectations; this signature inversion spin in the band may be larger than 25 . The combined effects of Coriolis and p-n residual interactions involved in such an inversion phenomenon have been discussed qualitatively.
21.10.Re - Collective levels.
23.20.Lv - Gamma transitions and level energies.
27.70.+q - .
© Società Italiana di Fisica, Springer-Verlag 2002