A thick target time-of-flight technique has been used to measure near-threshold neutrons from the ${}_{}{}^{65}{}_{}{}^{}\mathrm{Cu}(p, n){}_{}{}^{65}{}_{}{}^{}\mathrm{Zn}$ reaction. The neutron yield near threshold is dominated by a narrow $2^{-}$ or $3^{-}$ ${}_{}{}^{66}{}_{}{}^{}\mathrm{Zn}$ resonance 148 eV above the 2.17-MeV reaction threshold. The c.m. angular distribution of resonance neutrons is isotropic to within 10%. Neutrons from this resonance lie within a forward cone of half angle 32° and have laboratory energies of 1180.9±4.6 and 107.6±0.6 eV for 0 and 180° c.m. angles, respectively. These energies, when combined with the known masses and reaction $Q$ value, indicate a velocity decrease of 0.7% for the recoiling compound system before neutron decay. The product of the peak cross section and resonance width is 600±50 mb eV, and the width is between 2 and 10 eV. Detailed balance predicts a ${}_{}{}^{65}{}_{}{}^{}\mathrm{Zn}(n, p){}_{}{}^{65}{}_{}{}^{}\mathrm{Cu}$ cross section on the order of 1000 b at 144-eV neutron energy.

• Received 7 September 1972

DOI:https://doi.org/10.1103/PhysRevC.7.1645