Angular Yield of Neutrons from theT(d, n)He4Reaction for 6- to 11.5-Mev Deuterons

The angular yield of monoenergetic neutrons from the $\mathrm{T}(d, n){\mathrm{He}}^4$ reaction has been measured with 6.2-, 7.9-, 9.1-, 10.2-, and 11.4-Mev deuterons. The neutrons were detected with a proton recoil telescope which provided discrimination against neutrons from the $\mathrm{T}(d, np)\mathrm{T}$ breakup reaction. The yield curves are all peaked forward, with a second maximum at about 65° which becomes more pronounced with increasing energy, and a back-angle rise. A quasi-absolute determination of the 0° cross section for this reaction is described. The measured yield curves are compared to those for the companion ${\mathrm{He}}^3(d, p){\mathrm{He}}^4$ reaction and a strong similarity in shape and magnitude is noted. A simple stripping model is inadequate to describe these data. A distorted-wave calculation is required.