Spectral Measurement of the ${}^{214}$Bi beta-decay to the ${}^{214}$Po Ground State with XENONnT

E. Aprile, J. Aalbers, K. Abe +170

We report the measurement of the ${}^{214}$Bi beta-decay spectrum to the ground state of ${}^{214}$Po using the XENONnT detector. This decay is classified as first-forbidden non-unique…