Collective vibrations built on the Kπ=9− high-spin isomer in 180Ta

Abstract

Collective structures in 180Ta built on the meta-stable Kπ=9− high-spin isomer were investigated using two types of Coulomb excitation experiments. In-beam studies identify γ-vibrational bands with typical bandhead E2 excitation strengths of 6 Weisskopf units (W.u.). Coulomb activation of the 180Ta ground state was measured with 36S and 64Ni projectiles using thin targets. The excitation functions and the 180Ta recoil angular distributions favor a Kπ=7+ octupole vibration at Ex=1155(40) keV as intermediate state in the population of the ground state.