EPJ

2022 Impact factor 2.7
EPJ A - Hadrons and Nuclei
Hadrons and Nuclei
Eur. Phys. J. A 5, 345-349

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$\gamma $)180Ir reaction through excitation functions, X-$\gamma $ and $\gamma $-$\gamma $-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 $150\!\leq\!A\!\leq\!189$

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