Angular Yield of Deuterons and Alphas from the Proton Bombardment of Beryllium

Abstract

A photographic target chamber incorporating limited magnetic deflection of product particles was used to measure the angular yield of deuterons and alphas from the proton bombardment of beryllium at energies up to 1 Mev. The angular variation observed is of the form $1+A_{1}cos\theta +A_2{cos}^2\theta$, with relatively large values for $A_1$ indicating strong interference between states of the compound nucleus of opposite parity. The variation of the total cross sections with energy suggests the presence of a state of the compound nucleus at $E_p=0.68\mathrm{}$ Mev, in addition to the states previously known at $E_p=0.33\mathrm{} \mathrm{and} 0.94$ Mev. Range in emulsion vs energy measurements for the light nuclei observed in the reaction are also given.