A Twenty-Kilotonne Liquid Scintillator Detector: Energy Resolution and Reactor-Antineutrino Statistics Computed from Light Yield

A spherical liquid scintillator neutrino detector of 20 kilotonnes is designed around one quantity: its light yield. At 1,200 photoelectrons per MeV, collected by 14,934 photomultipliers at 75 percent coverage of a vessel of radius 17.6 m, the computed energy resolution is 3.06 percent at 1 MeV, 1.94 percent at 3 MeV and 3.69 percent at 662 keV, including a stated 1 percent constant term. At a 53 km baseline from 26.6 GW of reactor thermal power the detector records 60 inverse-beta-decay events per day, 21,900 per year. Structure is estimated at 3,400 tonnes and operating power at 436 kW. All figures are computed from the stated light-yield model; the design is simulated, not measured.