Structure of Pt isotopes along the line of stability

Excited states in stable Pt isotopes have been investigated through multi-nucleon transfer reactions. The isotopes studied range from ¹⁹²Pt which is formed solely through the s process up to the most neutron-rich ¹⁹⁸Pt which is produced in the r process. The evolution of structure with increasing neutron number has been mapped in these isotopes. New isomeric states are identified and rotational structures with underlying oblate deformation established. A striking contrast is visible between the gradual decrease in collectivity near the ground state with increasing neutron number, and its abrupt quenching at high spin around N=120. The role of high-j valence nucleons in determining the shape and extent of collectivity has been explored