Collective states in 230Ra fed by β − decay of 230Fr

Abstract

The γ-rays following the β − decay of 230Fr have been investigated by means of γ-ray singles including multispectrum analysis and γγ coincidence measurements using Ge(Li) detectors. The half-life of 230Fr was measured to be 19.1 ± 0.5 s. Most of the observed transitions could be placed in a level scheme comprising 23 new excited states of 230Ra, ten of them grouped into the K π = 0 + ground-state band, the K π = 0 − band with its 1 − state at 710.9 keV and a K π = 2 + γ-vibrational band with its head at 734.8 keV. It is concluded that 230Ra is a better rotator than the lighter radium isotopes, and has no ground-state octupole deformation.