(${}_{}{}^3{}_{}{}^{}\mathrm{He},t$) differential cross sections on ${}_{}{}^{54}{}_{}{}^{}\mathrm{Fe}$, ${}_{}{}^{58}{}_{}{}^{}\mathrm{Ni}$, and ${}_{}{}^{60}{}_{}{}^{}\mathrm{Ni}$ targets have been studied at 24-MeV incident energy. Triton angular-distribution systematics are suggested by corroborative data from other work. On this basis several tentative spin-parity assignments in the copper isotopes are given. Distorted-wave Born-approximation calculations based on a microscopic effective-interaction model are presented for ${}_{}{}^{54}{}_{}{}^{}\mathrm{Fe}$ and ${}_{}{}^{58}{}_{}{}^{}\mathrm{Ni}$. These are in fair agreement with the data for the ${}_{}{}^{54}{}_{}{}^{}\mathrm{Co}$ states thought to have ${\left(1\mathrm{}{f}_{\frac{7}{2}}\right)}^{-2\mathrm{}}$ structure, and for the $T=1\mathrm{}$ ${}_{}{}^{58}{}_{}{}^{}\mathrm{Cu}$ states. However, these calculations generally do not yield consistent effective-interaction strengths or correct angular-distribution shapes for the $T=0\mathrm{}$ ${}_{}{}^{58}{}_{}{}^{}\mathrm{Cu}$ transitions. Simple two-particle wave functions are used for mass-58 states where the nucleons occupy the $2p_{\frac{3}{2}}$, $1f_{\frac{5}{2}}$, or $2p_{\frac{1}{2}}$ orbitals.

• Received 20 February 1973

DOI:https://doi.org/10.1103/PhysRevC.8.247