Lifetime measurements of excited states in ¹⁹⁶Pt

Abstract

The lifetimes of six excited states in 196Pt up to an excitation energy of 1525 keV were measured by the recoil-distance method (RDM). These levels were populated by Coulomb excitation using both 90 MeV 20Ne and 220 MeV 58Ni ion beams. The measured lifetimes of the 21+, 41+, 61+, 22+, 42+ and O2+ states and the B(E2↓) values inferred for the depopulating transitions from these levels are presented. With the exception of the 21+ state, the meanlives of all other levels are the first such direct experimental determinations to be reported. NUCLEAR REACTIONS 196Pt Coulomb excitation, 90 MeV 20Ne and 220 MeV 58Ni ions, enriched target; measured Eγ, particle-γ coin., recoil-distance method, Doppler-shift attenuation. 196Pt levels: deduced T1/2, γ-branching ratios, inferred B(E2↓) values.