Abstract
The (7/2)(523) and (7/2)(404) bands are observed in /sup 159/Tm to I = (61/2) and (43/2), respectively, well beyond the i/sub 13/2/ neutron backbend. Before the backbend, the (7/2)(523) band exhibits large signature splitting, the (7/2)(404) none, which is interpreted as resulting from the very different driving influences of the K = (7/2) h/sub 11/2/, and g/sub 7/2/ orbits, respectively, on the core triaxiality. The i/sub 13/2/ neutron alignment changes the signature splitting in each band as a result of its dominant driving force to positive values of ..gamma... Measured B(M1;I..-->..I-1)/B(E2;I..-->..I-2) values increase dramatically after the backbend, and this is explained in terms of calculated increases in the M1 transition rates and decreases in the E2 rates.
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