Absolute Voltage Determination of Three Nuclear Reactions

A large electrostatic analyzer was used in conjunction with the Wisconsin electrostatic generator for an absolute voltage determination of the ${\mathrm{Li}}^7\mathrm{}\left(\mathrm{pn}\right)\mathrm{}{\mathrm{Be}}^7$ threshold, an ${\mathrm{Al}}^{27}\left(p\gamma \right){\mathrm{Si}}^{28}$ resonance, and a ${\mathrm{F}}^{19}(p{\alpha }^{\prime },\gamma ){\mathrm{O}}^{16}$ resonance. Using absolute volts the values found are 1.882 Mev, 0.9933 Mev, and 0.8735 Mev, respectively. The uncertainties in the measurements appear to be about ±0.1 percent.