Diffraction scattering of 17. 9-GeV/c. cap alpha. particles by hydrogen and helium nuclei

Absolute differential cross sections for elastic ..cap alpha..p scattering and the sum of elastic and quasielastic ..cap alpha cap alpha.. scattering have been measured with a normalization error no more than 3% for ..cap alpha.. particles with momentum 17.9 GeV/c in the interval of squared 4-momentum transfers 0.01