Improving the energy resolution of the reactor antineutrino energy reconstruction with positron direction
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ORIGINAL PAPER
Improving the energy resolution of the reactor antineutrino energy reconstruction with positron direction Lianghong Wei1,2 · Liang Zhan1
· Jun Cao1,2 · Wei Wang3
Received: 14 May 2020 / Revised: 1 July 2020 / Accepted: 7 July 2020 © Institute of High Energy Physics, Chinese Academy of Sciences 2020
Abstract 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. Keywords Energy resolution · Neutron recoiling · Positron direction reconstruction · Cerenkov
Introduction The neutrino oscillation phenomena open a door to new physics beyond the Standard Model of particle physics. Since 1998, a number of atmospheric, solar, accelerator and reactor experiments have provided us with very compelling evidences for neutrino oscillations. The ongoing and future neutrino oscillation experiments are expected to probe the neutrino mass ordering and the value of CP violating phase. Jiangmen Underground Neutrino Observatory (JUNO) [1,2] is proposed to determine the neutrino mass ordering with precise measurement of the reactor antineutrino energy spectrum. The energy resolution is crucial in order to determine neutrino mass ordering. The JUNO detector has 20-kton liquid scintillator as√detection target with a designed energy resolution of 3%/ E(MeV). Recent reactor neutrino experiments, Daya Bay [3–5], Double Chooz [6], RENO [7], and NEOS [8] have shown that the theoretical reactor antineutrino energy spectrum disagrees with the observed energy spec-
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Liang Zhan [email protected]
1
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
3
Nanjing University, Nanjing 210093, China
trum. Furthermore, the antineutrino energy spectrum shows fine structures in the summation of the spectra of thousands of beta-decay branches of fission products [9]. To provide a high precision reference spectrum for JUNO, Taishan Antineutrino Observatory [10] is proposed as a satellite experiment of √ JUNO with an energy resolution better than 2%/ E(MeV). TAO will also provide a high precision and high energy resolution measurement of the reactor antineutrino spectrum as a benchmark to test nuclear databases [11]. The reactor antineutrinos are usually detected by IBD reaction, ν¯ e + p → e+ + n, in liquid scintillator detectors. The positron kinetic energy is
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