Abstract
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 ${2}^{\ensuremath{-}}$ or ${3}^{\ensuremath{-}}$ $^{66}\mathrm{Zn}$ 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\ifmmode^\circ\else\textdegree\fi{} and have laboratory energies of 1180.9\ifmmode\pm\else\textpm\fi{}4.6 and 107.6\ifmmode\pm\else\textpm\fi{}0.6 eV for 0 and 180\ifmmode^\circ\else\textdegree\fi{} 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\ifmmode\pm\else\textpm\fi{}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.
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