The Gamma-Ray Spectrum ofB10

The gamma-rays from ${\mathrm{B}}^{10}$, produced by bombarding beryllium with 1 Mev deuterons, have been investigated by an examination of the momentum distribution of Compton electrons ejected from a thin mica foil in an expansion chamber. This spectrum consists of six gamma-rays of energies 0.51, 1.07, 1.44, 1.96, 2.81 and 3.21 Mev. These gamma-rays result from all possible transitions between three excited levels and the ground state of ${\mathrm{B}}^{10}$. The energy levels determined are in agreement with those obtained from a study of the neutron spectrum emitted by the same reaction.