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HK: Fachverband Hadronen und Kerne
HK 72: Nuclear Structure and Dynamics II
HK 72.9: Talk
Thursday, March 19, 2009, 18:45–19:00, H-ZO 50
Importance-Truncated No-Core Shell Model for Ab-Initio Nuclear Structure Calculations — •Robert Roth — Institut für Kernphysik, Tech. Univ. Darmstadt, Darmstadt, Germany
Ab-initio methods for the solution of the nuclear many-body problem play a crucial role for the development of a consistent QCD-based theory of nuclear structure and reactions. Many of the established ab-initio methods, like the no-core shell model (NCSM), are limited to light nuclei or very small NmaxℏΩ, simply because the model spaces become prohibitively large. In this talk an adaptive importance-truncation scheme is presented, which employs an a priori selection of the important basis states via perturbation theory and thus reduces the model-space dimension to a tractable size. The major elements and properties of this importance-truncated no-core shell model (IT-NCSM) are discussed. Results for ground and excited states of closed and open-shell nuclei up to mass A≈ 40 are presented and compared to full NCSM calculations. The properties of the IT-NCSM are contrasted with those of coupled-cluster approaches. An outlook to reaction calculations using IT-NCSM wave functions is given.