Development of a 10 mol% Rubidium-doped CsI Crystal for ${}^{87}$Rb Beta-Spectroscopy and Sterile Neutrino Searches

W. K. Kim, K. W. Kim, L. T. Truc +3

The third-forbidden non-unique beta-decay of ${}^{87}$Rb to ${}^{87}$Sr (Q${}_{\beta }=282.275(6)$ keV) has long served as an important benchmark for understanding forbidden beta-decay. To inv…