Investigation of high-spin states in odd-odd 190, 192, 194Au nuclei

Abstract High-spin states in the odd-odd Au nuclei 190,192,194 Au have been populated using ( α , x n) reactions and studied by means of in-beam γ-ray and e − spectroscopic methods. In each nucleus two negative-parity rotation-aligned bands were observed, which are based on an 11 − isomer and a 12 − state, respectively. They may have a configuration resulting from the coupling of a h 11 2 proton-hole and an i 13 2 neutron-hole coupled to a predominantly oblate core in agreement with recent theoretical predictions in the framework of the triaxial-rotor-plus-particle model. Furthermore, side structures based on 15 (+) states were established up to spins of I = (20) and (22) in 190,192 Au, respectively. The 15 (+) and 17 (+) members are considered to have a (πh 11 2 −1 v i 13 2 −2 (vj) configuration ( j = P 1 2 , P 3 2 or f 5 2 ). In the nucleus 194 Au a positive-parity rotation-aligned band based on a 7 + state was established up to the 13 + state. This band may have predominantly a (v i 13 2 −1 π d 3 2 −1 ) configuration.