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Nuclear pairing from chiral pion-nucleon dynamics

Original Article

Abstract.

We use a recently improved version of the chiral nucleon-nucleon potential at next-to-next-to-leading order to calculate the 1S0 pairing gap in isospin-symmetric nuclear matter. The pairing potential consists of the long-range one- and two-pion exchange terms and two short-distance NN-contact couplings. We find that the inclusion of the two-pion exchange at next-to-next-to-leading order reduces substantially the cutoff dependence of the 1S0 pairing gap determined by solving a regularised BCS equation. Our results are close to those obtained with the universal low-momentum nucleon-nucleon potential Vlow-k or the phenomenological Gogny D1S force.

PACS.

13.75.Gx Pion-baryon interactions 21.30.Cb Nuclear forces in vacuum 21.30.Fe Forces in hadronic systems and effective interactions 21.60.-n Nuclear structure models and methods 

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Copyright information

© Società Italiana di Fisica and Springer-Verlag 2005

Authors and Affiliations

  1. 1.Physik-DepartmentTechnischen Universität MünchenGarchingGermany
  2. 2.Physics Department, Faculty of ScienceUniversity of ZagrebZagrebCroatia

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