The Alpha-Particle Disintegration of Beryllium

Abstract

The disintegration of ${\mathrm{Be}}^{9}$ by 21.7-Mev alpha-particles has been studied with observations of the emitted particles made at various angles. $Q$-values of -6.92, -7.87, -8.57, and -10.74 Mev were found for the ${\mathrm{Be}}^{9}(\ensuremath{\alpha},p){\mathrm{B}}^{12}$ reaction giving levels in ${\mathrm{B}}^{12}$ at 0.95, 1.65, and 3.82 Mev. Two groups of deuterons from ${\mathrm{Be}}^{9}(\ensuremath{\alpha},d){\mathrm{B}}^{11}$ were found giving a level in ${\mathrm{B}}^{11}$ at 2.18 Mev. A third group, if assigned to this reaction would give a level in ${\mathrm{B}}^{11}$ at 0.65 Mev. The inelastic scattering ${\mathrm{Be}}^{9}(\ensuremath{\alpha},{\ensuremath{\alpha}}^{\ensuremath{'}}){\mathrm{Be}}^{9*}$ gives a level in ${\mathrm{Be}}^{9}$ at 2.63 Mev.