Absolute differential cross sections for alpha-alpha particle scattering have been measured at ten energies between 12.3 and 22.9 Mev. The laboratory angular range studied is 11° to 50°. The higher energy experiments at 21.65 to 22.9 Mev were concurrently carried out at two separate scattering chambers, one using nuclear emulsions as the detectors, the other, proportional counters. The experimental accuracy of these experiments is two percent or better at most angles. At the lower energies, 12.3 to 20.4 Mev, the study was made with nuclear emulsion detection only and the experimental accuracy is about three percent at most angles.

• Received 10 September 1956

DOI:https://doi.org/10.1103/PhysRev.104.1673