Measurement of the neutron differential elastic scattering fromZr90at 2.1 and 5.2 MeV

The differential elastic neutron cross section of ${}_{}{}^{90}{}_{}{}^{}\mathrm{Zr}$ was measured at 2.1 and 5.2 MeV. The Bettis pulsed Van de Graaff time-of-flight system was used in conjunction with a shielded neutron detector capable of $\gamma$ ray rejection by pulse shape discrimination. Identical geometry measurements made on a polyethylene sample were used for normalization of the ${}_{}{}^{90}{}_{}{}^{}\mathrm{Zr}$ data to the $\mathrm{H}\mathrm{}(n,n)\mathrm{}$ cross section. Comparisons were made to the results of optical model calculations.