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

High-spin states in the odd-odd Au nuclei sup(190, 192, 194)Au have been populated using (α, xn) 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 hsub(11/2) proton-hole and an isub(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 15sup((+)) states were established up to spins of I = (20) and (22) in sup(190, 192)Au, respectively. The 15sup((+)) and 17sup((+)) members are considered to have a (πhsub(11/2)-1νisub(13/2)-2νj) configuration (j = psub(1/2), psub(3/2) or fsub(5/2). In the nucleus 194Au a positive-parity rotation-aligned band based on a 7+ state was established up to the 13+ state. This band may have predominantly a (νisub(13/2)-1πdsub(3/2)-1) configuration. (orig.)