Counter Terms for Low Momentum Nucleon-Nucleon Interactions
Jason D. Holt, T. T. S. Kuo, G. E. Brown, Scott K. Bogner
Abstract
There is much current interest in treating low energy nuclear physics using the renormalization group (RG) and effective field theory (EFT). Inspired by this RG-EFT approach, we study a low-momentum nucleon-nucleon (NN) interaction, Vlow-k, obtained by integrating out the fast modes down the scale ~2fm-1. Since NN experiments can only determine the effective interaction in the low momentum region, our chief purpose is to find such an interaction for complex nuclei whose typical momenta lie below this scale. In this paper we find that Vlow-k can be satisfactorily accounted for by the counter terms corresponding to a short range effective interaction. The coefficients Cn of the power series expansion Cn*kn for the counter terms have been accurately determined and results derived from several meson-exchange NN interaction models are compared. The counter terms are found to be important for the S, P, and D partial waves. Scaling behavior of the counter terms is also studied, and we discuss the use of these methods for computing shell model matrix elements.
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