Abstract
The so-called effective range formula for nuclear scattering is deduced from the nuclear dispersion formalism for a fairly general class of potentials. It is shown that only in the case of zero angular momentum scattering is the angular momentum uniquely determined from the low energy variation of the cross section. The relation between the scattering length and effective range on the one hand and the parameters of nuclear dispersion theory (resonance levels and reduced widths) is briefly discussed.
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