Nuclear reaction rates and x-ray burst abundances from the ab initio symmetry-adapted no-core shell model

I outline a new formalism using the symmetry-adapted (SA) basis that begins with ab initio symmetry-adapted no-core shell-model (SA-NCSM) wave functions, and leads to a description of alpha-capture reaction rates and impacts on abundance patterns from x-ray burst nucleosynthesis. For narrow resonances, the physics of the system is described by the overlap of a wave function for the complete A-particle system and a cluster wave function. In this study, we consider a single partitioning (a single reaction channel) and no excitations of the clusters. We show results for O, Ne, and Mg isotopes, and abundance patterns determined from XRB nucleosynthesis simulations.