Gergana Stoitcheva

Oak Ridge National Laboratory

Shifted Contour Monte-Carlo method for Nuclear Structure

The shell model is one of the most successful descriptions of many-fermion systems including atomic nuclei. I will outline the difficulties in the framework of the conventional shell model diagonalization when approaching heavy systems (A>60). Furthermore, I will discuss the Auxiliary-field Shell Model Monte Carlo (SMMC) as our choice for reaching the properties of such nuclei of interest and the challenges in this approach. We demonstrate a promising development within the SMMC method that uses a shifted contour of integration to alleviate the Monte Carlo sign problem when performing calculations with realistic Hamiltonians. I will discuss the foundation of this new method, as applied to the nuclear many-body problem.

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