Quadrupole and monopole transition properties of 0+2 in Gd isotopes
Abstract
The longstanding problem of characterization of the 0+2 states in Gd isotopes is revisited by adopting the Nilsson+BCS mean field and the random-phase approximation. The interband electric quadrupole transition strengths varying almost two orders of magnitude are nicely reproduced at the same time as other observables. These results indicate that the 0+2 states, in particular, those in lighter isotopes are well described as β vibrations excited on top of deformed ground states without recourse to the shape-coexistence picture.
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