Direct neutron scattering from 182W and 184W

Differential elastic and inelastic neutron scattering cross sections for 182W and 184W have been measured at incident energies 4.87 and 6.00 MeV. Cross sections for the first (0+,2+,4+,6+), second (0+,2+), and some higher excitations are presented. Angular distributions exhibit direct reaction characteristics, suggesting that compound cross sections for these states are small. This is supported by statistical-model calculations. Coupled-channel calculations of cross sections are made using a phenomenological deformed optical potential. Quadrupole and hexadecapole deformations have been searched to optimize fits. The necessity of introducing a β6 deformation is investigated. Electric multipole transition matrix elements, used in the coupled-channel analysis, are obtained from the rotation-vibration model and the dynamic-deformation theory. (orig.)