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A systematic survey of the subject of the a-a interaction is made. The early observations of n emission and resulting theoretical descriptions, especially the a-particle model of nuclei, are described, as are more recent ascattering experiments. The latter were designed to obtain information about the nature of the -a interaction and about the energy levels of Be by studying the resonance behavior of the phase shifts, The phenomenological approach, i.e. , the attempt to construct the o. -a potential which reproduces the experimental phase shifts, is described as are detailed theoretical constructions of the repulsive inner part and attactive outer part of the a-a interaction. Studies of how the aa interaction provides better understanding of the structure of a-clustered nuclei and also of the fundamental forces between the constituents of these nuclei are discussed. Suggestions for the direction of further eBorts are made.

This paper gives a survey of the alpha-nucleon interaction and then describes experimental work on angular distributions of differential scattering cross sections and polarizations in proton-alpha and neutron-alpha scattering. The phenomenological approach, which includes the study of both local and nonlocal potentials reproducing the experimental alpha-nucleon scattering data, is discussed. Basic studies of the alphanucleon interaction attempting to build an interaction between an alpha particle and a nucleon from first principles are then described. The authors then present a critical discussion of the results with some concluding remarks suggesting the direction for further investigation.

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