Nuclear structure of neutron-deficient Au and Pt isotopes from high-resolution laser spectroscopy at ISOLDE

Atomic spectroscopy measurements were carried out using the COMPLIS setup installed at the ISOLDE-BOOSTER facility. Hyperfine structure (HFS) spectra and isotope shift (IS) values were obtained for the neutron-deficient Pt178-185 and for Au-184(g,m), providing deformation parameters beta, magnetic moments mu and spectroscopic quadrupole moments (for I greater than or equal to 1) Q(s). In Pt isotopes, a deformation drop for A = 178 and an inverted odd-even staggering for the charge radius around the neutron mid-shell N = 104, have been observed very clearly. Furthermore, deformation changes delta beta between isomeric and ground states for Pt-183,Pt-185 and Au-184 have been put forward. Thus, the influence of the proton-neutron coupling on the delta beta value in Au-184 relatively to that in its isotone Pt-183 has been determined. Besides, the h(9/2) proton state that is decoupled from the core in Au-183,Au-185, becomes the 3/2 [532] state strongly coupled in Au-184. The spin and parity values I-pi = 3(+) have been assigned to the Ir-182 ground state from internal conversion electron measurements to prepare atomic spectroscopy studies in the Ir isotopic series.