Fast-Neutron Scattering from Ta, Re, and Pt

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Abstract
The scattering of neutrons with energies of ≲1.5 MeV from the elements Ta, Re, and Pt was experimentally studied. Elastic and inelastic neutron-scattering angular distributions were determined at incident-neutron-energy intervals of ≲20 keV throughout the range 0.3 to 1.5 MeV. Time-of-flight measurements were made concurrently at eight or more scattering angles between 25° and 155° with sufficient scattered-neutron-energy resolution to separate the elastically scattered component from most inelastically scattered neutron groups. Differential inelastic scattering cross sections corresponding to the excitation of the following states were observed: in Ta at 144±10 (doublet), 313±15, 506±20, 620±20, 720±20, and 930±25 keV; in Re at 132±10, 219±15, 313±15, 387±18, 518±20, 637±20, 767±25, 865±25, 963±25, 1060±25, and 1135±25 keV; and in Pt at 130±20, 214±20, 348±15, 420±15, 620±20, 719±15, 838±25, and 935±20 keV. The experimental results were compared with calculations based upon the optical model and the Hauser-Feshbach formula including corrections for resonance-width fluctuations. The experimentally observed level structure is discussed in the context of single-particle and rotational states of deformed nuclei.