The angular distributions of absolute cross sections were measured for ($d,\alpha$) reactions at 27.5 MeV leading to the following final states: 4.63 and 7.47 MeV in ${\mathrm{Li}}^7$; ground and 0.872 MeV in ${\mathrm{O}}^{17}$; ground, 1.61 and 3.399 plus 3.408 MeV in ${\mathrm{Mg}}^{25}$. Measurements were carried out in the angular range from 15 to 120 lab deg, in 5-deg intervals for the forward, and 10-deg intervals for the backward hemisphere. A solid-state detecting system with a resolution in energy of about 1% was used. The angular distributions show pronounced forward peaking. Comparison is made with cross sections computed, in plane-wave Born approximation, for double pickup and knockout mechanisms.

• Received 3 September 1963

DOI:https://doi.org/10.1103/PhysRev.133.B350