Probing triaxiality beyond the proton drip line: Spectroscopy of Tm147

Abstract

Two triaxial states of the proton-decaying nucleus 147 Tm were studied via a comparison of experimental data to results obtained through nonadiabatic quasiparticle calculations. The experimental data were collected in a recoil-decay tagging study using the vacuum-mode recoil separator MARA coupled with the JUROGAM3 γ -ray spectrometer. The previously proposed level scheme above the triaxial 11 /2 − (π h11 /2 ) ground state was confirmed, and the level structure was expanded to cover the states above the weakly populated proton-emitting 5 /2 + (π d5 /2 ) isomeric state. It was found that the isomeric state is also triaxial, and possibly more deformed than the ground state.