Linking Of Yrast And Excited Superdeformed Bands In ~(152)Dy

摘要

The excitation energy, spin and parity of the yrast superdeformed band 1 in ~(152)Dy have been established. The evidence comes mainly from the measured properties of a 4011 keV single-step transition connecting the yrast superdeformed level fed by the 693 keV transition to the 27~- yrast state. Four additional, weaker, linking γ rays have been placed as well. The excitation energy of the lowest superdeformed band 1 member is 10,644 keV and its spin and parity are determined to be 24~+. A further nine transitions of dipole character have been identified, which connect the excited superdeformed band 6 in ~(152)Dy to the yrast SD band 1. The excitation energy of the lowest level in the excited SD band 1 is 14,239 keV. The lowest state in band 6 has been determined to be of negative parity and odd spin (29~- or 31~-). The measured properties of band 6 are consistent with an interpretation in terms of an octupole vibrational band. A comparison with an RPA calculation by Nakatsukasa et al. suggests that the spin of the lowest SD band 6 level is 31~-.