The ($d, p\gamma$) correlation at $E_d=0.84\mathrm{}$ Mev was measured under the following conditions: (1) proton direction fixed at 0° to the deuteron beam, gamma direction varying, (2) proton direction fixed at 90° to the beam, gamma direction varying in the deuteron-proton plane, and (3) proton direction fixed at 90°, gamma direction varying in the 90° plane, perpendicular to the beam. The three correlations were different, and showed varying amounts of anisotropy. The appearance of terms in ${cos}^4\theta$ in these correlations indicates that the spin of the first excited state of ${\mathrm{Be}}^{10}$ is ≥2. Coupled with other information on this state, this result gives a spin assignment of 2. A qualitative discussion of the correlations is given, and the effect of the deuteron stripping process is considered. The ($d, \alpha \gamma$) correlation was also measured with the alpha direction fixed at 90° to the beam and the gamma direction varying in the deuteron-alpha plane. Failure to detect a departure from isotropy again confirms the assignment of ½ to the spin of the first excited state of ${\mathrm{Li}}^7$.

• Received 29 October 1953

DOI:https://doi.org/10.1103/PhysRev.94.419