The existence of a level in ${\mathrm{Be}}^9$ at 3.01±0.1 Mev has been verified by the inelastic scattering of 21.6-Mev alpha particles and 10.8-Mev deuterons. Some evidence has also been found for a level in ${\mathrm{Be}}^9$ at 1.74±0.1 Mev. However, it is shown that the present experimental data are most simply explained by a three-body break-up of the compound nucleus with a final-state potential-scattering interaction between the outgoing neutron and ${\mathrm{Be}}^8$. The previously-reported occurrence of the reaction ${\mathrm{Be}}^9(\alpha , d){\mathrm{B}}^{11}$ to the ground state and 2.14-Mev excited state of ${\mathrm{B}}^{11}$ is verified.

• Received 19 July 1955

DOI:https://doi.org/10.1103/PhysRev.100.851