Neutron Inelastic Scattering fromZr90

Excitation functions have been measured for $\gamma$-ray emmission following neutron inelastic scattering from the 2.186-, 2.319-, 2.748-, 2.748-, 3.077-, 3.310- and 3.84-MeV levels of ${}_{}{}^{90}{}_{}{}^{}\mathrm{Zr}$ for neutrons in the energy range 2.85 to 5.97 MeV. The $\gamma$ rays were detected at 55° to the incident neutron beam using an anti-Compton spectrometer consisting of a NaI(T1) annulus enclosing a 45-${\mathrm{cm}}^3$ Ge(Li) detector. Multiple-scattering corrections were accounted for with the three-dimensional Monte Carlo code 05R. $\gamma$-ray angular distributions were calculated and used to deduce the total neutron inelastic scattering cross section from the cross section measured at 55°. These cross sections are in agreement with values calculated from Hauser-Feshbach theory corrected for level-width fluctuations and with previous measurements.