Deformation change between isomeric and ground states in the

Deformation changes δβ have been found out between isomeric and ground states of the 183Pt and 184Au isotones. Atomic spectroscopy measurements by laser were carried out using the COMPLIS setup. Hyperfine structure (HFS) spectra and isotope shift (IS) were obtained for the 5d96s 3D3→5d96p 3P2 and 5d106s 2S1/2→5d106p 2P3/2 optical transitions in Pt and Au atoms respectively, providing deformation parameters β and nuclear moments μ and Qs. The influence of the proton-neutron coupling on the δβ value in 184Au relatively to its isotone 183Pt has been determined. Besides, the h9/2 proton state that is decoupled from the core in 183,185Au, becomes the 3/2[532] state (h9/2 parentage) strongly coupled in the doubly-odd 184Au nucleus.