Systematics of the excitation energy of the 1(+) scissors mode and its
empirical dependence on the nuclear deformation parameter
Phys. Rev. C, 58 (1):
184-190 (July 1998)DOI: 10.1103/PhysRevC.58.184
Abstract
From the data on dipole excitations obtained in photon scattering
experiments we extract and tabulate the mean values of the excitation
energy of the 1(+) scisssors mode in nuclei of the mass region
130<A<200. The centers of gravity of the observed M1 strength
distributions are always close to 3 MeV including several moderately
deformed transitional nuclei. In particular, the data exhibit a weak
dependence of the scissors made energy on the deformation parameter.
Including roughly the deformation dependence of pairing effects we could
modify an earlier estimate based on a schematic random phase
approximation and get a simple formula which yields qualitative
agreement with the data.