Experimental evidence in support of triaxial shape of /sup 150,152,154/Sm nuclei

Theoretical B(E2) values and branching ratios in respect of /sup 150,152,154/Sm nuclei have been calculated recently using adiabatic time-dependent Hartree-Fock methods which are in poor agreement with experiment. The pairing-plus-quadrupole model of Kumar had already been a failure in describing samarium nuclei. Therefore the asymmetric rotor model has been employed to explain known individual B(E2) values, B(E2) branching ratios, and low lying energy levels. The comparison of phenomenological model results with those of microscopic models calculations has been done only to show the better fit achieved in the present work. The nonaxial parameter (γ) has been calculated by existing methods, viz., using the energy ratio E2/sup +prime//E2+, E4+/E2+, and E2/sup +prime//E6+ or E4+ and with new approach feeding E2+ and model dependent intrinsic quadrupole moment (Q0). The asymmetric rotor model estimates are the only one which stand by the simple test of Kumar (0.5<enhancement/hinderence factor F<2.0). It appears that the mass number A and charge number Z play an important role in assigning the shape of the nucleus in terms of the nonaxial parameter γ