Abstract
As a model of p-d elastic scattering, s-wave scattering is studied for a two-body potential that consist of a repulsive Coulomb potential and a central potential that decreases at large radius asthe inverse fourth power of that radius. It is proved that the usual Coulomb modified s-wave scattering length does not exist for such potentials. We define a different modified scattering length and conjecture that it is the quantity that is to be compared with published calculated and experimental values.
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