Darmstadt 2016 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 36: Structure and Dynamics of Nuclei VIII
HK 36.5: Vortrag
Mittwoch, 16. März 2016, 15:15–15:30, S1/01 A03
Initial Four-Body Forces in Many-Body Calculations — •Stefan Schulz and Robert Roth — Institut für Kernphysik, Technische Universität Darmstadt
For the ab-initio description of light and medium-mass nuclei, chiral effective field theory is used successfully. Improving the precision and uncertainty estimation of chiral forces, especially an improved description of medium-mass nuclei, requires consistent order-by-order calculations. Starting at N3LO, chiral four-body forces play a role and their impact on nuclei beyond few-body systems is currently unknown. Even without initial four-body forces, transformations such as the similarity renormalization group induce many-body forces.
We model the four-body forces using a simple contact interaction and investigate its effect on nuclear many-body observables, especially ground-state energies and radii, as well as correlations between them. The four-body forces are evaluated in a Jacobi harmonic oscillator (HO) basis and subsequently used in no-core shell model and Hartree-Fock calculations for light- and medium mass nuclei. Handling of chiral forces is identical to a contact interaction, once they are evaluated in a HO basis.
* Supported by GSI, DFG (SFB 1245), HIC for FAIR, and BMBF (05P15RDFN1)