The Angular Distribution of Alphas fromLi7(p,α)α

The tracks formed in photographic emulsions by alphas from the reaction ${\mathrm{Li}}^7(p,\alpha )\alpha$ at various angles from the beam were observed at bombarding energies $E$ between 400 and 900 kev. The angular distribution proportional to $1+A\left(E\right)\mathrm{} {cos}^2\theta$, as found by Young, Ellett, and Plain at lower voltages, was also observed here, and a maximum of $A\left(E\right)\mathrm{}$ was found at 675 kev.