Theory Seminar with Grigor Sargsyan on Charge-Exchange Transition and Collectivity

Ab initio models are built upon realistic inter-nucleon interactions, which empowers them with predictive capability. The symmetry-adapted no-core shell model (SA-NCSM) utilizes emergent symmetries in nuclei in order to reduce the dimensionality of the model space. This, in turn, allows one to reproduce the low-energy nuclear dynamics with only a small fraction of the model space, and hence making solutions to heavier nuclei and ultralarge model spaces feasible. The symmetry-adapted basis of the SA-NCSM is well suited for describing  electromagnetic and beta-decay transitions enabling us to perform calculations for up to pf-shell nuclei. This work discusses calculations of higher order recoil corrections in analyses of beta decay experiments for 8Be that probe fundamental symmetries as well as calculations of neutrinoless double beta decay matrix elements necessary to study whether neutrinos are their own antiparticles. In addition, I will discuss the n+6,7,8Li systems from first principles, including spectroscopic factors and asymptotic normalization coefficients, which can be used as input for constructing optical potentials that are important for analysis of existing or future experimental cross sections.

Zoom link available upon request at physics@wustl.edu.
Post-docs and students' Q&A with the speaker starts at 2:15 pm.  Contact Garrett King for the Q&A Zoom link.