The relative yields versus energy of protons from the reactions ${\mathrm{Li}}^6(d, p){\mathrm{Li}}^7$, ${\mathrm{Li}}^{7*}$ have been measured for deuteron energies up to 3.0 Mev. A marked difference in the energy dependence of the yields for the two reactions is noted. The yield for the reaction ${\mathrm{Li}}^6(d, p){\mathrm{Li}}^7$ shows a broad maximum centered about 1.1-Mev deuteron energy, whereas the yield from the ${\mathrm{Li}}^6(d, p){\mathrm{Li}}^{7*}$ reaction shows a slow increase throughout the whole energy range covered. Above 2.5 Mev the yield from ${\mathrm{Li}}^6(d, p){\mathrm{Li}}^{7*}$ exceeds the yield from ${\mathrm{Li}}^6(d, p){\mathrm{Li}}^7$. The angular distributions of the two proton groups have been observed at 0.825, 2.0, and 3.0 Mev. The angular distributions of the two groups are quite similar at all energies covered. The Butler analysis of the angular distribution data indicates that in both reactions the neutron is captured with one unit of orbital angular momentum. Since ${\mathrm{Li}}^6$ has even parity and spin 1, this gives odd parity for the ground state and the first excited state of ${\mathrm{Li}}^7$ and possible values of ½, $\frac{3}{2}$, and $\frac{5}{2}$ for the spins of the ground state and the first excited state. These possible values include the known spin of $\frac{3}{2}$ for the ground state and the currently accepted spin of ½ for the first excited state.

• Received 21 September 1953

DOI:https://doi.org/10.1103/PhysRev.95.426