ORBITAL MAGNETIC DIPOLE STRENGTH IN SM-148, SM-150, SM-152, SM-154, AND NUCLEAR-DEFORMATION

Nuclear-resonance-fluorescence spectra have been measured in the chain of Sm148,150,152,154 isotopes. Together with supplementary information from inelastic electron scattering and other reaction studies, orbital M1 transition strengths have been deduced for a number of 1+ states located around an excitation energy of 3 MeV. The systematic study, carried out for the first time, for nuclei within a large range of the deformation parameter shows that the orbital M1 strength varies quadratically with . This result is interpreted in terms of models containing explicitly neutron and proton degrees of freedom. © 1990 The American Physical Society.