Elastic scattering and disintegration of 10.3-Mev deuterons bombarding ${\mathrm{He}}^4$ have been studied by means of a multiple nuclear plate camera. The reaction $\mathrm{D}+{\mathrm{He}}^4\to {\mathrm{He}}^4+p+n-2.2\mathrm{}$ Mev was observed with a total cross section of 0.3±0.1 barn. The protons show a marked tendency to emerge in the forward direction, and there is some, not very strong, evidence for the formation of ${\mathrm{He}}^5$ as an intermediate product. The differential elastic scattering cross section was measured at intervals of 2.5° in the laboratory system from 12.5° to 140°. The shape of this cross-section curve can be inferred from the following approximate values (angles in CM system and differential cross sections in millibarns per unit solid angle): 29.4°, 186; 58.4°, 9.7; 97.7°, 69; 129.3°, 37; 157.4°, 82.4.

• Received 19 February 1951

DOI:https://doi.org/10.1103/PhysRev.82.786