ReactionQValues from Near-Threshold Neutron Spectra

A thick-target time-of-flight technique has been employed to measure neutron energies for ($p,n$) resonance levels near threshold in medium-weight nuclei. Combining the results with proton energy measurements of these resonances, the following ground state $\mathrm{}(p,n)\mathrm{} Q$ values have been deduced: ${}_{}{}^{41}{}_{}{}^{}\mathrm{K}$, -1203.8±0.5 keV; ${}_{}{}^{45}{}_{}{}^{}\mathrm{Sc}$, -2843.6±4.0 keV; ${}_{}{}^{51}{}_{}{}^{}\mathrm{V}$, -1533.7±1.5 keV; and ${}_{}{}^{57}{}_{}{}^{}\mathrm{Fe}$, -1618.2±2.0 keV.