Abstract
High spin states have been studied in133La via the122Sn (15N, 4ny) fusion evaporation reaction. Bands build on low lying h11/2,g7/2 and d5/2 proton states have been identified. At higher spin a h11/2 neutron alignment is observed. The softness with respect to the triaxial deformation makes the nuclear shape sensitive to the quasiparticle configurations and coexistence between states withy ≈ + 30°,y ≈ − 30° andy ≦ − 60° was found. The results have been interpreted using total routhian surface (TRS) model calculations.
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The authors wish to thank the technical staff at the NBI tandem laboratory at Risø. We are also indepted to R. Wyss for making computer codes and TRS results available. One of us (G. Sz.) wish to thank the Swedish Insitute (SI) for their financial support during his stay in Stockholm. This work was supported by the Magn Bergvall foundation, the NOAC/NORDITA collaboration and the Swedish Natural Science foundation (NFR).