The cross section ($\frac{d^5\sigma }{d{\Omega }_{p}d{\Omega }_{t}d{T}_p}$) for the reaction ${}_{}{}^6{}_{}{}^{}\mathrm{Li}\mathrm{}(p,pt)\mathrm{}$ has been measured in a kinematically complete experiment. The energy resolution did not allow for an identification of the final-state residual nucleus. The cross-section data obtained, when analyzed in terms of the recoil momentum of the three-nucleon residual system, has the shape characteristic of an $S$ state for the relative motion of the triton. If the cross section is fitted with a Gaussian the width at $\frac{1}{e}$ is $\Gamma =100\mathrm{}\pm 20\frac{\mathrm{MeV}}{c}$, and the cross section at zero recoil is 490±120 nb/${\mathrm{sr}}^2$MeV. The width observed is twice as large as obtained in previous, lower-energy experiments, but only slightly larger than predicted by ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$-cluster-model calculations.

• Received 23 March 1973

DOI:https://doi.org/10.1103/PhysRevC.8.877