Charge-Exchange and/or Knockout Spectator Poles in the ReactionD(He3,tp)p

Intense spectator-proton peaks were observed in the reaction $\mathrm{D}({}_{}{}^3{}_{}{}^{}\mathrm{He},tp)p$. Their shapes were well fitted by plane-wave Born-approximation calculations, assuming either knockout or ${}_{}{}^3{}_{}{}^{}\mathrm{He}-n$ quasielastic scattering accompanied by charge exchange to be the mechanism. Their intensities relative to the quasielastic peaks from $\mathrm{D}({}_{}{}^3{}_{}{}^{}\mathrm{He},{}_{}{}^3{}_{}{}^{}\mathrm{He}p)n$ were correctly predicted by charge-exchange calculations, but only when an unrealistic mixture of exchange forces was used. All direct knockout calculations gave relative intensities at least ten times too small.