Universal momentum distributions for the spin-singlet <i>NN</i> channels*

Abstract The formalism for a quantitative treatment of high-momentum components of momentum distributions for the spin-singlet channels is presented. This approach suggests that the use of a distribution for a virtual state in momentum representation for the channel in question is a universal one, which can be further employed within contact formalisms for nuclei. It is shown how such distributions can be calculated from low-energy scattering wave functions in the same channels. As a result, a new characteristic (a constant) for the high-momentum part of the momentum distribution in a spin-singlet channel is introduced. To test the approach, we calculate the nuclear contacts for the , nucleus which appear to be nearly the same for four realistic interactions with essentially different high-momentum properties. The results should be useful for researchers studying the problem of short-range correlations in nuclei. In particular, the approach gives a generalization for the formalisms based on nuclear contacts.