Improved search for two-neutrino double electron capture on ${}^{124}$Xe and ${}^{126}$Xe using particle identification in XMASS-I

XMASS Collaboration, K. Abe, K. Hiraide +39

We conducted an improved search for the simultaneous capture of two $K$-shell electrons on the ${}^{124}$Xe and ${}^{126}$Xe nuclei with emission of two neutrinos using 800.0 days of d…