The ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ar}({}_{}{}^3{}_{}{}^{}\mathrm{He}, d)$ reaction, at 18 MeV ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ energy, has been used to study states in ${}_{}{}^{41}{}_{}{}^{}\mathrm{K}$ that are unbound to proton emission. The ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ar}$ target was contained in a gas cell with no entrance window. Excitation energies and angular distributions were obtained for levels from $E_x=7.836\mathrm{} \mathrm{to} 10.239$ MeV. A distorted-wave analysis was used to determine $l$ values and to extract widths ${\Gamma }_p$ for comparison with the results of previous ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ar}(p, p)$ work. The analog of the ground state of ${}_{}{}^{41}{}_{}{}^{}\mathrm{Ar}$, at 8.349 MeV excitation in ${}_{}{}^{41}{}_{}{}^{}\mathrm{K}$, and six excited-state analogs were observed.

NUCLEAR REACTIONS ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ar}({}_{}{}^3{}_{}{}^{}\mathrm{He}, d)$, $E=18\mathrm{}$ MeV; measured $\sigma (E_d, \theta )$; deduced ${}_{}{}^{41}{}_{}{}^{}\mathrm{K}$ unbound states, $l$, ${\Gamma }_p$, $C^2{S}_{\mathrm{lj}}$.

• Received 2 April 1975

DOI:https://doi.org/10.1103/PhysRevC.12.401