Mainz 2012 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 10: Struktur und Dynamik von Kernen

HK 10.5: Vortrag

Montag, 19. März 2012, 18:00–18:15, RW 3

Consistent SRG transformed chiral two- plus three-body interactions — •Angelo Calci, Joachim Langhammer, Sven Binder, and Robert Roth — Institut für Kernphysik, Technische Universität Darmstadt

Chiral effective field theory provides two- (NN) and three-body (3N) interactions from QCD in a consistent manner. We employ these interactions in ab initio nuclear structure calculations within the importance-truncated no-core shell model (IT-NSCM) using an additional Similarity Renormalization Group (SRG) transformation to improve convergence. Formally, the SRG induces irreducible many-body contributions, which nowadays can be included up to the three-body level. Using a flow-parameter analysis we show that the conventional SRG evolution induces sizeable many-body contributions for nuclei in the mid-p-shell and beyond. We demonstrate that the induced many-body contributions originate from the two-pion exchange terms of the initial 3N interaction. Finally, the suppression of the induced many-body contributions either by an alternative formulation of the SRG or by a modification of the initial chiral interactions is discussed. This opens an opportunity to universal applications of chiral 3N interactions in nuclear structure.

Supported by DFG (SFB 634), HIC for FAIR, and BMBF (06DA9040I).