Signature dependence of M1 and E2 transition probabilities for the i/sub 13/2 rotational band in /sup 161/Dy

The ground-state rotational band of /sup 161/Dy has been investigated through multiple Coulomb excitation with a beam of 250-MeV /sup 58/Ni. ..gamma..-ray branchings and E2M1 mixing ratios were determined up to the (252/sup +/ state by measurements of ..gamma..-ray angular distributions and ..gamma..-..gamma.. angular correlations. Nuclear lifetimes of levels up to I = (252 have been measured using the Doppler-shift recoil-distance method. Considerable signature dependence was observed for ..delta..I = 1 M1 transition probabilities. ..delta..I = 1 E2 transition probabilities were found to decrease significantly as a function of spin. The results are compared with a microscopic model calculation based on the angular momentum projection method.