Lifetimes of high spin states in Ir181 and Os180

The Nd150(35Cl,4n)181Ir and Nd150(34S,4n)180Os reactions have been used to study the lifetimes of high-spin states in Ir181 and Os180 using the recoil-distance technique. The lifetimes of four states in Ir181 and three yrast states in Os180 have been determined. The mean weighted values of quadrupole moments deduced for the measured rotational transitions between yrast states in Ir181 and Os180, Q0=(6.0±0.2) e b and Q0=(6.1±0.4) e b, respectively, are equal within experimental errors

Backbending in the 1 2-[541] band in 181 Ir

A backbending has been observed in the 1 2-[541] band in the odd-proton nucleus 181Ir at h{stroke}ω ∼ 0.3 MeV, with Δix ∼ 6.5h {combining short solidus overlay}, in contrast with only an upbend observed near this frequency in the "core" nucleus 180Os. The nature of this backbend is explored in the framework of the cranked Hartree-Fock-Boguliubov approximation

Lifetime measurements in 184Pt and the shape coexistence picture

Lifetimes for levels in the yrast band of 184Pt have been measured up to spin 16+ using the recoil distance technique. The B(E2) values exhibit a marked increase in going from spin 2 to 10, consistent with a proposal that two bands of different deformations are mixing at low spin. This provides further support for shape coexistence occuring at low excitation energies in this region

Level Structure in 141,143-Eu Studied by (6-Li,xn) Reactions

This work was supported by National Science Foundation Grant PHY 76-84033 and Indiana Universit

Reactions Induced by High Energy 6-Li Ions and In-Beam γ-Ray Spectroscopy of N=80 and N=78 Nuclei

This work was supported by National Science Foundation Grant PHY 75-00289 and Indiana Universit