Abstract
Differential elastic and inelastic cross sections were measured for 1.5-MeV neutrons scattered by the even- isotopes of zirconium and molybdenum. The scattering samples were enriched isotopes of , , , , , , and . The cross sections were measured using a dynamically biased neutron time-of-flight spectrometer. The differential cross sections have root-mean-square relative and normalization uncertainties of 2 to 3.5% and 7 to 7.5%, respectively, for elastic scattering, and 6 to 13% and 9 to 15%, respectively, for inelastic scattering. Isotopes with similar level structures have almost identical elastic angular distributions. The entire set of data was theoretically fitted using the optical-statistical model with resonance-width-fluctuation corrections. The calculated elastic differential cross section was assumed to be an incoherent sum of shape-elastic and compound-elastic scattering. At the minima in the angular distributions the cross sections were dominated by compound-elastic scattering.
NUCLEAR REACTIONS , , (), MeV; measured ; deduced optical model parameters. Isotopically enriched samples, neutron time of flight, dynamic bias, compound-elastic scattering, level width fluctuations.
- Received 31 January 1974
DOI:https://doi.org/10.1103/PhysRevC.10.1087
©1974 American Physical Society