3S1-3D1 EFFECTIVE-RANGE PARAMETERS OF SOME REALISTIC NUCLEON-NUCLEON POTENTIALS

We consider the P- and Q-shape parameters in the eigenphase and ''bar' ' phase shift representations for the two Reid potentials and the more recent Moscow potential. The values of these parameters were obtained from integrals of the zero-energy wave function in a similar manner t o that for the effective range. Such expressions for the shape paramet ers yield more reliable numerical values of the shape parameter than t hose obtained by least-mean-squares or polynomial fits. We show that t he eigenphase representation is more meaningful than the ''bar'' phase shift representation and that the variation in the values of P(alpha) in the models may be of significance.