Investigation of lifetimes in the dipole band of ¹³⁹Sm

Lifetimes have been measured for a dipole band in Sm-139 using DSAM. The deduced B(M1) and B(E2) values as well as B(M1)/B(E2) ratios are compared with calculations in the framework of the TAC (Tilted Axis Cranking) and SPAC (Shears mechanism with Principal Axis Cranking) models. The dipole band in Sm-139 can be considered as a magnetic rotational band with a prolate or triaxial nuclear deformation.