The gamma rays produced in the bombardment of ${\mathrm{Be}}^9$ (thick target) with 2.8-Mev deuterons were measured with a three-crystal pair spectrometer. The gamma rays are assigned in a consistent manner to decay from known levels of ${\mathrm{Be}}^{10}$ and ${\mathrm{B}}^{10}$. Using information from stripping reactions it can then be inferred that the spins of the 5.96- and 6.26-Mev levels of ${\mathrm{Be}}^{10}$ are $1^{-}$ and $2^{-}$, respectively. Furthermore it is shown that the gamma-ray and stripping information is consistent with spins $2^{-}$ and $2^{+}$ for the 5.11- and 5.16-Mev levels of ${\mathrm{B}}^{10}$, respectively, and that the 5.16-Mev level of ${\mathrm{B}}^{10}$ must have a very small alpha-particle reduced width, in accordance with a proposal of Wilkinson and Jones. Reduced widths of many levels of ${\mathrm{Be}}^{10}$ and ${\mathrm{B}}^{10}$ are summarized and analog levels in the two nuclei are searched for and compared.

• Received 12 May 1958

DOI:https://doi.org/10.1103/PhysRev.111.1348