-Neutron capture and transmission measurements were performed by the time-of-flight tech

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Differential cross sections for neutrons elastically scattered from ' C and inelastically scattered to the first three excited states ' C*(3.09, 3.68, and 3.85 MeV} were measured at 69 incident energies for 4.5&E"&11 MeV. A multiple scattering code provided a simulation of the experimental scattering process allowing accurate corrections to the small measured inelastic cross sections. The integrated "C(n, n)' Be cross section was determined by subtracting the sum of the measured integrated cross sections from the total. Shell-model calculations were used to generate the R-matrix parameters for the elastic and first three inelastic channels of "C+n, and, after some minor adjustments, the predicted structure generally agreed with experiment for E"&4MeV. Previous elastic "C+n data were refitted to replace constant Ro R-matrix background terms by more realistic broad states and to achieve better agreement with model calculations and the data. R-matrix fitting of the full data set produced new ' C level information. For E"&4 MeV (E & 12 MeV), five states were given definite J assignments and three states tentative assignments.

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Abstract-The purpose of the present work is to accurately measure the neutron cross sections of samarium The most signijicant isotope is