Abstract
For a given ..cap alpha cap alpha.. potential we show how to calculate in a convenient way the half-off-the-energy-shell cross section sigma/sub half/ for ..cap alpha cap alpha.. scattering. We compute sigma/sub half/ numerically for energies up to 125 MeV (lab), and make a comparison with the free-scattering cross section. Coulomb effects are included rigorously. In particular, we recall that sigma/sub half/ is a discontinuous function of the off-shell-momentum variable at the on-shell value. We confirm that off-shell effects are sizeable, and discuss the relevance for the plane-wave impulse approximation and distorted-wave impulse approximation descriptions of (..cap alpha..,2..cap alpha..) reactions.
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