Münster 2017 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 49: Structure and Dynamics of Nuclei VIII
HK 49.7: Talk
Thursday, March 30, 2017, 18:30–18:45, F 33
Pairing in neutron matter: New uncertainty estimates and three-body forces — •Christian Drischler1,2, Thomas Krüger1,2, Kai Hebeler1,2, and Achim Schwenk1,2,3 — 1Institut für Kernphysik, Technische Universität Darmstadt — 2ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH — 3Max-Planck-Institut für Kernphysik, Heidelberg
We discuss BCS pairing gaps in the partial-wave channels 1S0 and 3P2-3F2 in neutron matter based on nucleon-nucleon (NN) and three-nucleon (3N) interactions derived within chiral effective field theory.
Applying new uncertainty estimates that rely on an order-by-order analysis in the chiral expansion, we show first results for the recent local and semilocal NN-only potentials up to next-to-next-to leading order (N2LO) and N4LO, respectively, with different regulator cutoffs. Our recent improved normal-ordering method allows us to investigate pairing gaps with consistent NN and 3N forces up to N3LO. We show results for three more traditional chiral potentials including both leading and subleading 3N contributions.
Finally, we report on a robust method to solve the non-linear BCS gap equation which allows to assess the numerical convergence.
* This work is supported by the ERC Grant No. 307986 STRONGINT and the DFG through Grant SFB 1245.