Electroweak transitions in intermediate mass nuclei

We calculate beta decays and B(E2) values using the ab initio symmetry-adapted no-core shell model (SA-NCSM). The SA-NCSM employs emergent symmetries in nuclei in order to decrease the dimensionality of the model space, this allows us to reproduce the low-energy nuclear dynamics using only a small fraction of the model space, thus expanding the reach of ab initio theory to heavier nuclei, such as sd-shell nuclei and ⁴⁸Ca. This work aims to contribute to the study of the long standing g_A quenching problem and ultimately to study ⁴⁸Ca and ⁴⁸Ti, of interest to neutrinoless double beta decays.