Beryllium enriched to 5% in ${}_{}{}^{10}{}_{}{}^{}\mathrm{Be}$ has been extracted from neutron-irradiated carbon, and has been used for targets in nuclear spectroscopy. The cross section for the production of ${}_{}{}^8{}_{}{}^{}\mathrm{Li}$ via deuteron bombardment of ${}_{}{}^{10}{}_{}{}^{}\mathrm{Be}$ has been measured from 0.67 to 3.0 MeV, and the production cross section of ${}_{}{}^{11}{}_{}{}^{}\mathrm{Be}$ has been measured from 2.3 to 12 MeV. The yield for both reactions varies smoothly with bombarding energy, and no resonance in ${}_{}{}^{12}{}_{}{}^{}\mathrm{B}$ is seen. From magnetic spectroscopy of the ${}_{}{}^{10}{}_{}{}^{}\mathrm{Be}(d, p)$ reaction, the mass excess of ${}_{}{}^{11}{}_{}{}^{}\mathrm{Be}$ is found to be 20.174±0.007 MeV (${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$=0) and the excitation energy of the first excited level to be 318 ± 7 keV. The angular distribution of protons populating the 318-keV level is an $l_n=1\mathrm{}$ pattern, implying $J^{\pi }={\frac{1}{2}}^{-} or {\frac{3}{2}}^{-}$.

• Received 15 December 1969

DOI:https://doi.org/10.1103/PhysRevC.1.1939