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 ${\mathrm{Li}}^{7}(\mathrm{pn}){\mathrm{Be}}^{7}$ threshold, an ${\mathrm{Al}}^{27}(p\ensuremath{\gamma}){\mathrm{Si}}^{28}$ resonance, and a ${\mathrm{F}}^{19}(p{\ensuremath{\alpha}}^{\ensuremath{'}},\ensuremath{\gamma}){\mathrm{O}}^{16}$ 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 \ifmmode\pm\else\textpm\fi{}0.1 percent.