Eur. Phys. J. A (2000) 8: 439-442
https://doi.org/10.1007/s100500070066

Short Note

Observation of signature inversion in odd-odd ¹⁷⁸Ir

¹ Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, P.R.China
² Japan Atomic Energy Research Institute, Tokai, Ibaraki, 319-1195, Japan
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

^* e-mail: zzzhao@ns.lzb.ac.cn

Received: 23 March 2000
Revised: 5 July 2000
Published online: 15 August 2000

Abstract

High spin states in ¹⁷⁸Ir have been studied via the ¹⁵²Sm(³¹P,5nγ)¹⁷⁸Ir reaction through excitation functions, X-γ and γ-γ-t coincidence measurements. According to the band structure characteristics and the measured intraband B(M1)/B(E2) ratios, two rotational bands are identified and assigned to be associated with the πh _9/2⊗υi _13/2 and πh _11/2⊗υi _13/2 configurations, respectively. Both bands show the signature inversion feature.