Mainz 2012 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 36: Struktur und Dynamik von Kernen

HK 36.5: Talk

Wednesday, March 21, 2012, 18:00–18:15, P 4

Ab-initio Spectroscopy of p- and sd-Shell Nuclei with Chiral Two- plus Three-Body Interactions — •Joachim Langhammer, Angelo Calci, Sven Binder, and Robert Roth — Institut für Kernphysik, Technische Universität Darmstadt

Chiral effective field theory provides the most systematic QCD-based interaction for nuclear structure calculations. We present ab-initio calculations of spectra and spectroscopic observables for p- and sd-shell nuclei obtained within the importance-truncated no-core shell model (IT-NCSM) using chiral two-body (NN) plus three-body (3N) interactions. To improve the convergence of the IT-NCSM calculations, we soften the nuclear NN+3N interactions via a consistent Similarity Renormalization Group transformation at the three-body level. The comparison of our predictions for spectra and spectroscopy to experimental data provides new benchmarks of the quality of chiral interactions. Furthermore, we study the sensitivity of the spectroscopy for A≥10 including the carbon isotopic chain to the parameters of the chiral forces, e.g. the low-energy constants (LECs) or the cut-off. With these results we investigate the propagation of the uncertainties of the LECs into nuclear structure.

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