Search for Double Beta Decay of ${}^{136}$Xe to the $0_1^{+}$ Excited State of ${}^{136}$Ba with PandaX-4T

PandaX Collaboration, Lingyin Luo, Zihao Bo +98

We perform a search of double beta decay of ${}^{136}$Xe to the excited state, $0_1^{+}$, of ${}^{136}$Ba (2$\nu \beta \beta$-0${}_1^{+}$), using the dual-phase xenon detector of PandaX-4T with the firs…