Darmstadt 2016 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 42: Structure and Dynamics of Nuclei IX

HK 42.1: Vortrag

Mittwoch, 16. März 2016, 16:30–16:45, S1/01 A03

Ab Initio Spectroscopy of Open-Shell Medium-Mass Nuclei: Merging Configuration Interaction and In-Medium Similarity Renormalization Group — •Eskendr Gebrerufael¹, Robert Roth¹, Klaus Vobig¹, and Heiko Hergert² — ¹IKP, TU Darmstadt, Germany — ²NSCL, Michigan State University, USA

In the past years there has been rapid progress in the ab initio description of medium-mass closed-shell nuclei. One of the most flexible and efficient approaches is the In-Medium Similarity Renormalization Group (IM-SRG). The initial formulation of the IM-SRG is limited to ground states of closed-shell nuclei, but first extensions to open-shell systems and spectra have been proposed through multi-reference or valence-space formulations.

Building and extending these ideas, we present a novel ab initio approach for the structure and spectroscopy of all open-shell nuclei in the medium-mass regime. An initial Configuration-Interaction (CI) calculation in a limited model space is used to define a reference state for the multi-reference IM-SRG evolution of the Hamiltonian for the target nucleus. The resulting IM-SRG evolved Hamiltonian is employed in a second no-core CI calculation to extract ground and excited states as well as spectroscopic observables. We present first applications to the spectroscopy of carbon, oxygen and neon isotopes and compare to ab initio no-core shell model calculations.
Supported by DFG (SFB 1245), HIC for FAIR, BMBF (05P15RDFN1)