Energy Levels inZr91Excited by the (d, p) Reaction

Eleven energy levels in ${\mathrm{Zr}}^{91}$ were excited. The excitation energies of the levels are 0, 1.22, 2.07, 2.19, 2.56, 2.84, 3.05, 3.25, 3.45, 3.65, and 3.87 Mev. Angular distributions were measured for the first four levels and assignments were made using the shell-model and the Butler stripping theory. The assignments are $2d_{\frac{5}{2}}$ for the ground state, $3s_{\frac{1}{2}}$ for the 1.22-Mev state, $2d_{\frac{3}{2}}$ for the 2.07-Mev state, and $1g_{\frac{7}{2}}$ for the 2.19-Mev state. The application of the Butler theory to the data gave reasonable and useful fits. The ground-state $Q$ value was measured and is 5.02±0.03 Mev.