The decay scheme of 228Fr and K = 0 BANDS in 228Ra

The γ-rays following the β − -decay of 228 Fr have been studied by means of γ-ray singles including multi-spectrum analysis and γ-γ coincidence measurements using Ge(Li) spectrometers. Most of the observed γ-transitions could be placed in the level scheme of 228 Ra. The accuracy the energy of the first-excited state in 228 Ra has been improved and 35 new excited levels have been established, 11 of them grouped into the ground-state band, the low-lying K π = 0 − band with the head at 474.14 keV and two excited K π = 0 + bands with heads at 721.17 and 1041.9 keV. Candidates for two close-lying K π = 2 + bands have also been found. It is concluded that the ground state octupole deformation, if any, is less pronounced in 228 Ra than in lighter radium isotopes.