Abstract
Time of flight spectra of near threshold neutrons from the $^{64}\mathrm{Ni}(p,{n}_{1})^{64}\mathrm{Cu}^{*}$ reaction clearly show the presence of a ${\frac{5}{2}}^{+}$ resonance which is located 2.7 eV above the 2.67-MeV threshold. Its total width is 5 eV and its peak cross section is 14 mb. Through this study one deduces the basic limitation on the technique of high resolution spectroscopy very near reaction thresholds. Very near neutron thresholds, because a number of kinematic factors conspire in a favorable way, one can achieve the equivalent of slow-neutron resolution even though the neutrons are not slow. We know of no other technique which would allow individual study of such resonances.NUCLEAR REACTIONS $^{64}\mathrm{Ni}(p,{n}_{1})^{64}\mathrm{Cu}^{*}$, near threshold; measured neutron spectra. Deduced resonance parameters of the first resonance above threshold. Deduced basic limitations on the near threshold technique.
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