SCATTERING OF NEUTRONS WITH ENERGIES SIMILAR-TO 1-300 KEV BY KRYPTON AND XENON

Differential cross sections for elastic scattering of neutrons with en ergies up to approximately 300 keV by gaseous krypton and xenon have b een measured. Oxygen was used as a calibration element. The neutron st rength functions S0, S1/2(1), and S3/2(1) and the remote-level contrib utions R0 infinity and R1 infinity were determined from the experiment al cross sections by the method of least squares. The experimental val ues found for these parameters fill some gaps in the experimental resu lts on 34 nuclei over the mass-number interval 48 < A < 144. The krypt on measurements refine the curve describing the experimental scatterin g lengths for p-wave scattering in the region A congruent-to 70-90, in which the phase shift of the neutron p wave is found to have an anoma lous positive sign. The results on neutron scattering by xenon provide additional information near the upper boundary of the mass-number int erval of interest.