The alpha-particles from boron bombarded by 1.51-Mev deuterons have been investigated with a magnetic spectrometer. Two groups of alpha-particles have been assigned to the reaction ${\mathrm{B}}^{11}(d,\alpha ){\mathrm{Be}}^9$ with $Q$-values of 8.018±0.007 and 5.596±0.006 Mev, indicating a virtual state of ${\mathrm{Be}}^9$ at 2.422±0.005 Mev. The previously unreported alpha-particle group corresponding to this excited state had a natural half-width of less than 7 kev. No additional alpha-groups corresponding to excited states of ${\mathrm{Be}}^9$ were observed for excitations of ${\mathrm{Be}}^9$ from 0 to 5.0 Mev.

• Received 25 September 1950

DOI:https://doi.org/10.1103/PhysRev.81.233