Phenomenological NN potential from the analysis of three- and four- particle nuclei

Upper and lower energy estimates for nuclei with A=3 and 4 are calculated basing on a proposed here many-particle variational approach. A high efficiency of the method for (3-5)-particle systems is shown with a number of concrete examples. Semi-realistic central pair NN potentials are constructed leading to correct magnitudes of the binding energies, sizes and form factors of the nuclei 3H-3He, 4He. It is shown that the constructed potentials may be applied to describe the two-particle data, including the s-wave phase shifts for the np scattering, as well as the binding energy and the size of the deuteron