(α, n) Type Reactions in Light Nuclei

Two independent methods utilizing a recoil proton telescope and a neutron threshold detector have been used to study a series of ($\alpha , n$) reactions. The following $Q$ values have been observed: ${\mathrm{B}}^{10}(\alpha , n){\mathrm{N}}^{13}$-3.85±0.3, (-3.2±0.3), -2.5±0.3, -1.3±0.3 Mev; ${\mathrm{B}}^{11}(\alpha , n){\mathrm{N}}^{14}$-4.8±0.3, -3.85±0.3, -3.15±0.3, -2.0±0.3, 0.0±0.3 Mev; ${\mathrm{F}}^{19}(\alpha , n){\mathrm{Na}}^{22}$-5.0±0.2, -4.25±0.2, -3.8±0.2, -3.15±0.2, -2.45±0.2, -2.0±0.2 Mev; ${\mathrm{P}}^{31}(\alpha , n){\mathrm{Cl}}^{34}$-5.7±0.2 Mev. An excitation function has also been obtained for the 1.58-second ${\beta }^{+}$ activity in ${\mathrm{Cl}}^{34}$ with an observed threshold at -5.7±0.3 Mev.