Q-Value Measurements for Phosphorus and Chlorine

Abstract

Targets containing phosphorus and chlorine have been bombarded by protons accelerated by the ONR-Bartol Van de Graaff generator. Charged particles from nuclear reactions have been analyzed at 90° by using a 180° double-focusing magnetic spectrometer. The following ground-state $Q$-values have been determined: ${\mathrm{P}}^{31}(p, \alpha ){\mathrm{Si}}^{28}$, $Q=1.911\mathrm{}\pm 0.005$ Mev; ${\mathrm{Cl}}^{35}(p, \alpha ){\mathrm{S}}^{32}$, $Q=1.851\mathrm{}\pm 0.007$ Mev; ${\mathrm{Cl}}^{37}(p, \alpha ){\mathrm{S}}^{34}$, $Q=3.015\mathrm{}\pm 0.011$ Mev. The following level positions have been measured: ${\mathrm{P}}^{31}$, 1.264±0.004 Mev; ${\mathrm{S}}^{34}$, 2.129±0.014 Mev; ${\mathrm{Cl}}^{35}$, 1.219±0.005 Mev and 1.760±0.004 Mev.