Short note
Rotational bands in Odd-Odd 180Ir
Y.H. Zhang1,2 - T. Hayakawa1 - M. Oshima1 - J. Katakura1 - Y. Hatsukawa1 - M. Matsuda1 - H. Kusakari3 - M. Sugawara4 - T. Komatsubara5
1 Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan
2 Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, P.R.China
3 Chiba University, Inage-ku, Chiba 263-8512, Japan
4 Chiba Institute of Technology, Narashino, Chiba 275-0023, Japan
5 Institute of Physics and Tandem Accelerator Center, University of Tsukuba, Ibaraki
305-0006, Japan
Received: 26 April 1999 / Revised version: 24 May 1999 Communicated by B. Herskind
Abstract
High spin states in 180Ir have been studied via 154Sm(31P,5n)180Ir reaction through excitation functions, X-
and
-
-t coincidence measurements. Three rotational
bands are identified including a doubly decoupled band, a semi-decoupled
one, and a coupled structure up to (26+). The quasiparticle configurations
associated with these bands are suggested according to in-band B(M1)/B(E2)
ratios and band structures of neighboring odd-odd nuclei. Signature inversion
in the semidecoupled band is discussed relying on systematics.
PACS
21.10.Re Collective levels -
23.20.Lv Gamma transitions and level energies -
27.70.+q
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