Theory of ReactionsH3(d, n)He4andHe3(d, p)He4

The reactions ${\mathrm{H}}^3(d, n){\mathrm{He}}^4$ and ${\mathrm{He}}^3(d, p){\mathrm{He}}^4$ are fitted by using one-level and one-level-plus-background dispersion formulas and taking into account the implications of the principle of charge symmetry of nuclear forces. Fits are found by using a variety of penetration parameters and channel radii. The schematic treatment of Breit and the $\mathcal{R}$-matrix formalism of Wigner and Eisenbud are used to obtain the one-level-plus-background formulas and fits made by using them are compared with those obtained by previous workers using one-level formulas. The connection of these reaction fits with recent $n$+${\mathrm{He}}^4$ scattering data is discussed.