Search for neutrinoless quadruple beta decay of ${}^{136}$Xe in PandaX-4T detector

PandaX Collaboration, Zhiyuan Li, Peiyuan Chen +103

The observation of neutrinoless quadruple beta decay (0$\nu$4$\beta$) in the absence of neutrinoless double beta decay (0$\nu$2$\beta$) has been argued to provide a strong indication that neut…