A pathway to unveiling neutrinoless $\beta \beta$ decay nuclear matrix elements via $\gamma \gamma$ decay

Beatriz Romeo, Damiano Stramaccioni, Javier Menéndez +1

We investigate the experimental feasibility of detecting second-order double-magnetic dipole ($\gamma \gamma$-$M1M1$) decays from double isobaric analog states (DIAS), which have recently bee…