Nuclear Structure ofNa23: TheNe22(He3,d)Reaction

Using the ${}_{}{}^{22}{}_{}{}^{}\mathrm{Ne}({}_{}{}^3{}_{}{}^{}\mathrm{He},d){}_{}{}^{23}{}_{}{}^{}\mathrm{Na}$ reaction at a bombarding energy of 15 MeV, excitation energies and angular distributions have been obtained for 96 levels below $E_x=10.2\mathrm{}$ MeV in ${}_{}{}^{23}{}_{}{}^{}\mathrm{Na}$. Data were recorded in 3.75° steps in a multiangle spectrograph. Angular distributions were compared with distorted-wave Born-approximation predictions; values of transferred angular momentum and spectroscopic strength were extracted for 42 levels, including the three lowest $T=\frac{3}{2}$ states. An empirical forward-angle $J$ dependence has been used to distinguish between $J_f^{\pi }={\frac{3}{2}}^{+}$ and ${\frac{5}{2}}^{+}$ for $l_P=2\mathrm{}$ transfers. The summed $l_P=0\mathrm{}$ and $l_P=2\mathrm{}$ spectroscopic strengths agree with theoretical expectations. The results of the present investigation are combined with previous information and discussed in terms of the rotational model. The low-lying negative-parity states are examined in terms of their particle or hole character. The results for both positive- and negative-parity states suggest significant deviations from the predictions of a simple rotational model, even with band mixing.