Nuclear Recoil in theC12(p,pn)C11Reaction. II. Energy Distribution

The energy distribution of the recoiling ${\mathrm{C}}^{11}$ atoms from the reaction ${\mathrm{C}}^{12}\mathrm{}(p,pn)\mathrm{}{\mathrm{C}}^{11}$, induced by 450-MeV protons, was measured at eight laboratory angles between 30° and 150° to the beam direction. The contribution of various mechanisms to the total cross section is estimated, and a direct knockout mechanism is shown to predominate—if, indeed, a distinction among the different mechanisms can be made in such light nuclei. The results are compared with a distorted-wave calculation of Benioff and Person.