The ($p,t$) reaction on the even-even $N=Z$ nuclei in the $2s1d$ shell has been used to study the energy levels of ${}_{}{}^{18}{}_{}{}^{}\mathrm{Ne}$, ${}_{}{}^{22}{}_{}{}^{}\mathrm{Mg}$, ${}_{}{}^{26}{}_{}{}^{}\mathrm{Si}$, ${}_{}{}^{30}{}_{}{}^{}\mathrm{S}$, ${}_{}{}^{34}{}_{}{}^{}\mathrm{Ar}$, and ${}_{}{}^{38}{}_{}{}^{}\mathrm{Ca}$. The energies of the excited states observed are reported along with spin and parity assignments when possible. Two-nucleon-transfer distorted-wave calculations were carried out. Comparisons are made with the shapes of the experimental angular distributions. It is found that the calculated shapes are primarily dependent upon the $L$ transfer and the optical-model parameters. The magnitudes of the calculated cross sections are found to depend strongly not only on the optical-model parameters, but also the bound-state parameters and the configuration mixing in the initial and final nuclear wave functions.

• Received 21 June 1971

DOI:https://doi.org/10.1103/PhysRevC.5.485