Signal and Background Modeling

The dominant interaction channel of electron antineutrinos in water is the inverse beta decay (IBD), in which the final state consists of one neutron and a positron. This is detected as a delayed coincidence. This analysis set the reactor neutrino and the diffuse supernova neutrino as the targets. The atmospheric neutrinos, several radioactive isotopes \(^{9}\) Li in the cosmic muon spallation, and natural radioactive isotopes can become similar event topologies and be detected as the delayed coincidence. The IBD interaction and the background events are simulated and evaluated. In addition, there is a chance of uncorrelated events coinciding. This chapter shows the physics modeling for those signals and backgrounds.