Mainz 2012 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 10: Struktur und Dynamik von Kernen
HK 10.2: Gruppenbericht
Montag, 19. März 2012, 17:00–17:30, RW 3
Ab-Initio Theory of Medium-Mass Nuclei with Normal-Ordered Chiral NN+3N Interactions — •Sven Binder, Joachim Langhammer, Angelo Calci, Klaus Vobig, and Robert Roth — Institut für Kernphysik, Technische Universität Darmstadt
We study the use of truncated normal-ordered three-nucleon interactions in ab initio nuclear structure calculations starting from chiral two- plus three-nucleon Hamiltonians evolved consistently with the similarity renormalization group (SRG). We present three key steps: (i) a rigorous benchmark of the normal-ordering approximation in the importance-truncated no-core shell model (IT-NCSM) for 4He, 16O, and 40Ca; (ii) a direct comparison of the IT-NCSM results with coupled-cluster calculations at the singles and doubles level (CCSD) for 16O; and (iii) first applications of SRG-evolved chiral NN+3N Hamiltonians in CCSD for the medium-mass nuclei 16,24O and 40,48Ca. We show that the normal-ordered two-body approximation works very well beyond the lightest isotopes and opens a path for ab initio studies of medium-mass and heavy nuclei with chiral two- plus three-nucleon interactions. For low-lying excited states and collective excitations we present first applications of the EOM-CCSD method, which is superior to RPA-type approaches.
Supported by DFG (SFB 634), HIC for FAIR, and BMBF (06DA9040I).