Improving the energy resolution of the reactor antineutrino energy reconstruction with positron direction

Purpose Improving the energy resolution of the reactor antineutrino energy reconstruction.
Methods Simulate the energy resolution of a liquid scintillator detector and reconstruct the antineutrino energy with the positron scattering angle, a simple positron direction reconstruction method is implemented in a toy liquid scintillator detector like the Taishan Antineutrino Observatory (TAO) with 4500 photoelectron yield per MeV.
Results A 4% to 26% improvement of energy resolution can be achieved for 5 MeV reactor antineutrinos at TAO.
Conclusion The emission direction of the produced positron in IBD reaction can be used to estimate the kinetic energy of neutron and thus the reconstructed antineutrino energy resolution can be improved.