Recoil Properties ofBi209(p, pxn)Spallation Products

Recoil properties of products of ${\mathrm{Bi}}^{209}(p, pxn)$ reactions at a bombarding proton energy of 450 MeV have been measured and compared with those predicted from the Monte Carlo cascade calculations of Metropolis et al. Agreement is good, although it appears that the calculation overestimates the transverse momentum component. The effect on the results caused by scattering of the recoiling nuclei during the stopping process is shown to be important. Approximate values for the yield ratios ${\mathrm{Bi}}^{205}$/${\mathrm{Bi}}^{206}$, ${\mathrm{Po}}^{205}$/${\mathrm{Bi}}^{205}$, and ${\mathrm{Po}}^{206}$/${\mathrm{Bi}}^{206}$ are presented. The latter two seem higher than those previously reported.