https://doi.org/10.1140/epja/i2005-10122-3
Original Article
Nuclear pairing from chiral pion-nucleon dynamics
1
Physik-Department, Technischen Universität München, D-85748, Garching, Germany
2
Physics Department, Faculty of Science, University of Zagreb, Zagreb, Croatia
* e-mail: vretenar@phy.hr
Received:
25
February
2005
Accepted:
12
July
2005
Published online:
29
August
2005
We use a recently improved version of the chiral nucleon-nucleon potential at next-to-next-to-leading order to calculate the 1 S 0 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 1 S 0 pairing gap determined by solving a regularised BCS equation. Our results are close to those obtained with the universal low-momentum nucleon-nucleon potential V low-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 –
© Società Italiana di Fisica and Springer-Verlag, 2005
