Ni62,64(He3,d)Cu63,65Reaction

A 22-MeV ${\mathrm{He}}^3$-ion beam was used to excite states in ${\mathrm{Cu}}^{63}$ and ${\mathrm{Cu}}^{65}$ by means of the (${\mathrm{He}}^3,d$) reaction on ${\mathrm{Ni}}^{62}$ and ${\mathrm{Ni}}^{64}$. Levels were analyzed up to approximately 4 MeV of excitation. The angular distributions obtained in the forward-angle region were compared to predictions from a distorted-wave stripping calculation, and orbital angular-momentum transfers and spectroscopic factors were obtained. On the basis of this analysis, large fractions of the $2p_{\frac{1}{2}}$ and $1f_{\frac{5}{2}}$ proton single-particle strengths appear in the first few excited states of ${\mathrm{Cu}}^{63}$ and ${\mathrm{Cu}}^{65}$. This result is in marked disagreement with the predictions of the simple excited-core model, but in fair to good agreement with more extended model calculations. The sums of the spectroscopic factors for each single-particle state are compared with predicted values. Angular distributions were also obtained in the backward-angle region, and provide strong evidence for a $j$-dependent effect for $l=1\mathrm{}$ transitions. The possible importance of certain secondary-reaction mechanisms is examined briefly.