In-beam gamma-ray spectroscopy of Po-190 : First observation of a low-lying prolate band in Po isotopes

• Gamma rays from excited states of Po-190 have been observed using I the Jurosphere Ge-detector array coupled to the RITU gas-filled separator. They were associated with a collective band which from spin 4h onwards resembles the prolate rotational bands known in the isotones Pb-188 and Hg-186. This indicates that in Po-190 the prolate configuration becomes yrast above I = 2h. The experimental results are interpreted in a two-band mixing calculation and are in agreement with a-decay data and potential energy surface calculations.

Nyckelord

alpha-decay

shape coexistence

polonium isotopes

intruder states

nuclei

onset

collectivity

deformation

region

pb-186

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