Differential Cross Section of the ReactionHe3(d,p)He4at 10.2-Mev Bombarding Energy and Search for Excited State inHe4

Abstract

The differential cross section of the reaction ${\mathrm{He}}^3\mathrm{}(d,p)\mathrm{}{\mathrm{He}}^4$ has been measured by means of a photographic technique. The cross section shows a high degree of asymmetry and is quite similar to that previously measured for the $\mathrm{T}\mathrm{}(d,n)\mathrm{}{\mathrm{He}}^4$ differential cross section at 10.5 Mev. This similarity suggests equality of $p-p$ and $n-n$ forces. Observations of the short-range particles from bombardments of ${\mathrm{He}}^3$ and T gases under identical conditions permit the assignment of upper limits for the reaction ${\mathrm{He}}^3(d,p^{\prime }){\mathrm{He}}^{4*}$. At a laboratory angle of 90°, the cross section is less than 0.2×${10}^{-27\mathrm{}}$ ${\mathrm{cm}}^2$ for an excited state below 20.9 Mev.