NUCLEON-NNCLEON INTERACTIONS AND OBSERVABLES

A class of nucleon-nucleon interactions which are exactly phase equiva lent to a given realistic nucleon-nucleon interaction is exhibited. Th ese interactions have the property that the rms radius of the deuteron can be made arbitrarily large without changing the deuteron binding e nergy or any of the nucleon-nucleon scattering matrix elements. With t his construction it is possible to find realistic interactions that do not obey the linear relation between the rms radius and the triplet s cattering length observed by Klarsfeld et al.. The interpretation of t his result is discussed.