Achim Schwenk

Ohio State University, Columbus

Effective interactions and pairing in nuclear systems

I first discuss how the renormalization group can be used to construct a model-independent nucleon-nucleon interaction Vlow k. Vlow k unifies all potential models used in nuclear structure calculations. Results for few-nucleon systems are presented. I will then discuss the role of many-body correlations for pairing and for the effective interaction in nuclear matter, with particular attention to the spin dependence. I will show that, in addition to the standard forces, spin non-conserving effective interactions and a novel long-wavelength tensor force are induced in the medium. Finally, I present results for the renormalization of non-central forces and P-wave pairing gaps in neutron matter and discuss their implications for the evolution of neutron stars.

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