4π CsI(Tl) detector for EC/β+ decay searching in 84Sr

We developed a SrCl
2
crystal scintillator for 0υ Electron Capture/β+ decay search, and 4π CsI(Tl) tagging detector to reduce the background. This experimental system was installed at the YangYang underground laboratory which is for the WIMP search by KIMS group. The system ran for 60 days and we have finished analyzing for 2 hits back to back coincidence signal selection.