A new model for attenuation effects in quasifree scattering in the reactions ${}_{}{}^2{}_{}{}^{}\mathrm{H}\mathrm{}(p,2p)n$, ${}_{}{}^3{}_{}{}^{}\mathrm{He}\mathrm{}(p,2p)d$, ${}_{}{}^4{}_{}{}^{}\mathrm{He}\mathrm{}(p,2p)\mathrm{}{}_{}{}^3{}_{}{}^{}\mathrm{H}$, ${}_{}{}^6{}_{}{}^{}\mathrm{Li}(\alpha ,2\mathrm{}\alpha )d$, and ${}_{}{}^6{}_{}{}^{}\mathrm{Li}(p,p\alpha )d$ is proposed. The attenuation of events from the primary quasifree reaction occurs through the rescattering of the emerging quasifree particles by the spectator nucleus $S$. These particles and $S$ are represented by core regions of strong interaction, the sizes of which are directly related to their total cross sections. Good agreement with the experimental results of Pugh et al. is obtained.

NUCLEAR REACTIONS ${}_{}{}^2{}_{}{}^{}\mathrm{H}$, ${}_{}{}^{3,4}{}_{}{}^{}\mathrm{He}\mathrm{}(p,2p)\mathrm{}$, $E=20\mathrm{}-60$ MeV; ${}_{}{}^6{}_{}{}^{}\mathrm{Li}(p,p\alpha )d$, $E=57\mathrm{}$ MeV; ${}_{}{}^6{}_{}{}^{}\mathrm{Li}(\alpha ,2\mathrm{}\alpha )d$, $E=55\mathrm{}$ MeV; calculated $\sigma$.

• Received 27 March 1974

DOI:https://doi.org/10.1103/PhysRevC.10.431