Abstract
Relative electromagnetic transition rates in 165Lu 94 have been measured to high spin ( I≤ 63 2 ) for the two signature components of a band built on a π h 11 2 shell-model state. M1 transitions are observed through two band crossings. A DSAM measurement indicates that full collectivity persists for the π h 11 2 configuration up to I ≤ 53 2 and that for higher values of I a loss of collectivity could explain the observed increased values of B( M1, I → I−1)/ B(E2, → I−2). The effects of alignment, shape changes and rotationally induced deoccupation of antialigned configurations are discussed. In the measured values of the ratio of transition quadrupole moments Q 1/ Q 2 the influence of the vi 13 2 alignment is observed for the first time. The data are discussed within the context of triaxial nuclear deformation. Comparisons are made with the nuclei 161,163Lu.
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