Q-Value Measurements for Aluminum and Chlorine

Abstract

Nuclear reaction energies have been measured by using a 180° double-focusing magnetic spectrometer. In order to test the reliability of the energy calibration of the spectrometer, two ${\mathrm{Al}}^{27}(p, \alpha ){\mathrm{Mg}}^{24}$ groups were observed, with measured $Q$ values of 1.596±0.006 and 0.230±0.005 Mev, corresponding to the ground state of ${\mathrm{Mg}}^{24}$ and the first excited state at 1.366±0.006 Mev. A further check was provided by the observation of six ${\mathrm{Al}}^{27}(p, p^{\prime }){\mathrm{Al}}^{27}$ inelastic groups, corresponding to ${\mathrm{Al}}^{27}$ levels at 0.842±0.003, 1.013±0.003, 2.205±0.004, 2.727±0.004, 2.975±0.004, and 2.998±0.004 Mev. In view of the good agreement of these results with previous measurements, the ground-state $Q$ values of the ${\mathrm{Cl}}^{35}(p, \alpha ){\mathrm{S}}^{32}$ and ${\mathrm{Cl}}^{37}(p, \alpha ){\mathrm{S}}^{34}$ reactions have been remeasured as 1.860±0.005 and 3.028±0.006 Mev.