The ${\mathrm{Li}}^6(n, t){\mathrm{He}}^4$ reaction cross section has been measured in a neutron energy interval extending from 9 kev to 340 kev. The cross section descends from 1.77 barns at 9 kev to a minimum of 0.74 b at 100 kev before rising to a peak resonance value of 2.75 barns at 258 kev. The cross section from 9 kev to 90 kev is not proportional to $E^{-\frac{1}{2}}$, but can be represented by $\sigma =3.96\mathrm{}{E}^{-0.367\mathrm{}}$ with $\sigma$ in barns and the neutron energy $E$ in kev. Angular distributions of the tritons are presented for neutron energies of 150, 200, 258, 300, 350, and 565 kev. These distributions, measured in a relative manner, are placed on an absolute scale by normalizing to the cross section data of this experiment, extended to 565 kev by use of previously measured cross sections.

• Received 6 November 1958

DOI:https://doi.org/10.1103/PhysRev.114.1580