The cross section for the ${\mathrm{Li}}^6(n, t){\mathrm{He}}^4$ reaction has been measured for 12.5- to 18.3-Mev neutrons. The neutrons were obtained from the $\mathrm{T}(d, n){\mathrm{He}}^4$ reaction and their flux density was determined by counting the recoil ${\mathrm{He}}^4$ particles. A ${\mathrm{Li}}^6$I(Eu) scintillation crystal 1½ inches in diameter by ½ inch thick served as both the ${\mathrm{Li}}^6$ sample and the detector for the reaction products. The cross section is nearly linear from 34.3 mb at 12.5 Mev to 17.6 mb at 18.3 Mev. It is 28.1±1.6 mb at 14.2±0.2 Mev.

• Received 23 June 1958

DOI:https://doi.org/10.1103/PhysRev.112.926