# S13−3D1effective-range parameters of some realistic nucleon-nucleon potentials Academic Article

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### abstract

• 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 to that for the effective range. Such expressions for the shape parameters yield more reliable numerical values of the shape parameter than those obtained by least-mean-square or polynomial fits. We show that the 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.

• May 1993