Abstract
Proton-alpha particle coincidence spectra from 101.5 MeV ($\mathrm{p},\mathrm{p}\ensuremath{\alpha}$) reactions on $^{16}\mathrm{O}$, $^{20}\mathrm{Ne}$, $^{24}\mathrm{Mg}$, $^{28}\mathrm{Si}$, $^{32}\mathrm{S}$, $^{40}\mathrm{Ca}$, $^{48}\mathrm{Ti}$, $^{54}\mathrm{Fe}$, and $^{66}\mathrm{Zn}$ have been obtained in a coplanar geometry at quasifree angle pairs for each target. A missing energy resolution of $\ensuremath{\lesssim}450$ keV was sufficient to separate the lowlying states of the residual nuclides. Data for ground-state transitions, and for eight excited states were obtained and compared with distorted-wave impulse approximation calculations. The targetmass dependence of the resultant relative ground-state spectroscopic factors is reasonably consistent with that obtained from ($^{6}\mathrm{Li}$,d) reactions. The corresponding absolute spectroscopic factors are larger than shell-model predictions, but sensitive to the bound-state parametrization. However, the spectral shapes do constrain the range of possible bound-state rms radii. The fits to the excited states are less satisfactory.
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