The angular correlation$f$of the neutrons to the first excited state in ${\mathrm{Be}}^7$ and the associated 430-kev gamma rays has been measured. Energy selection of the neutrons was made possible by a time-of-flight spectrometer. The angular correlations were predominantly isotropic at bombarding energies below 600 kev, while above this energy the correlations showed a strong peaking in the beam direction. Analysis using stripping theory shows that the 430-kev state is very probably a $J=\frac{1}{2}-$ state. The excitation function corrected for Coulomb penetration shows a resonance corresponding to an excited state in ${\mathrm{Be}}^8$ at 22.6 Mev.

• Received 12 June 1956

DOI:https://doi.org/10.1103/PhysRev.103.1758