Reaction Li6(p,pt) at 590 MeV

The cross section ($\frac{{d}^{5}\ensuremath{\sigma}}{d{\ensuremath{\Omega}}_{p}d{\ensuremath{\Omega}}_{t}d{T}_{p}}$) for the reaction $^{6}\mathrm{Li}(p,pt)$ 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 $\ensuremath{\Gamma}=100\ifmmode\pm\else\textpm\fi{}20\frac{\mathrm{MeV}}{c}$, and the cross section at zero recoil is 490\ifmmode\pm\else\textpm\fi{}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.