The energy of the gamma-radiation produced when ${\mathrm{Be}}^9$ is bombarded by 2.6-Mev protons has been measured with a scintillation spectrometer and found to be 3.58±0.04 Mev. A suggestion of Hushley that this gamma-ray is produced in the reaction ${\mathrm{Be}}^9$ ($p$,$\alpha \gamma$) ${\mathrm{Li}}^6$ was verified by observing coincidences between the gamma-rays and low energy alpha-particles. The excited state of ${\mathrm{Li}}^6$ which emits the gamma-rays probably has spin zero and even parity and is presumably the analog of the ground state of the isobaric nucleus, ${\mathrm{He}}^6$. The thick target yield and cross section at resonance were found to be 4.8×${10}^{-6\mathrm{}}$ gamma-rays per proton and 0.11×${10}^{-24\mathrm{}}$ ${\mathrm{cm}}^2$, respectively.

• Received 5 November 1951

DOI:https://doi.org/10.1103/PhysRev.85.582