The Angular Distributions of the Products of the D - D Reaction: 1 to 3.5 Mev

Cross sections per unit solid angle for the reactions ${\mathrm{H}}^2+{\mathrm{H}}^2\to {\mathrm{He}}^3+n$ and ${\mathrm{H}}^2$+${\mathrm{H}}^2$→${\mathrm{H}}^1$+${\mathrm{H}}^3$ have been measured at various angles for incident deuterons of energies from 1 to 3.5 Mev. The dependence of the cross sections on angle is nearly the same for the two reactions, and it can be represented by an expression of the form $A(1+B{cos}^2\phi +C{cos}^4\phi )$, where $\phi$ is the angle of observation in the center of mass coordinate system. $A$ increases from ${4\times 10}^{-27\mathrm{}}$ ${\mathrm{cm}}^2$ at 1 Mev to 6×${10}^{-27\mathrm{}}$ ${\mathrm{cm}}^2$ at 3.5 Mev; $B$ decreases from approximately 1 at 1 Mev to -3.5 at 3.5 Mev; $C$ increases from 1.5 at 1 Mev to 7 at 3.5 Mev. The total cross sections for the two reactions are approximately constant at ${10}^{-25\mathrm{}}$ ${\mathrm{cm}}^2$ throughout this energy range.