Seminar Details

First Ab Initio Nuclear Modeling Across the Intermediate-Mass Region

Kristina Launey, Louisiana State University
Tuesday, March 25, 11:00 AM - Theory Seminar
NSCL Seminar Room

For intermediate-mass nuclei (starting with strategic "sd-shell" examples), which are currently inaccessible by standard ab initio no-core shell model (NCSM) calculations, symmetry-based considerations are essential for nuclear structure and reactions, including microscopic studies of proton-capture reactions and level densities. I will discuss an innovative symmetry-adapted no-core shell model (SA-NCSM), which capitalizes on exact as well as partial symmetries that underpin the structure of nuclei. This approach provides a strategy for determining the nature of bound states of nuclei in terms of a relatively small fraction of the complete shell-model space, which, in turn, has opened new domains of nuclei for ab initio investigations. In particular, the SA-NCSM builds upon the ab initio foundation of the NCSM, while extending its reach to heavier nuclear systems, such as Ne, Mg, and Si isotopes, by recognizing that deformed configurations often dominate and these, while typically described by a manageable number of collective basis states, correspond to a special linear combination of an ultra-large number of NCSM basis states. The outcome points to a remarkable new insight into the symmetry patterns observed in the many-body nuclear dynamics as well as in nucleon-nucleon interactions, including their effective counterparts derived in the framework of the Similarity Renormalization Group (SRG).