Speaker
Description
Liquid scintillator detectors have assumed significant importance in neutrino physics owing to their cost-effectiveness and high precision. The determination of the neutrino mass ordering, the search for neutrinoless double-beta decay, and similar efforts impose increasingly stringent requirements on the energy resolution of liquid scintillator detectors. However, backgrounds such as C14 can lead to the formation of pile-up events, which degrade the energy resolution. We describe the detector response using the spatio‑temporal Poisson density of photoelectrons (PEs) and have developed a photon‑by‑photon event reconstruction method based on Markov Chain Monte Carlo. By leveraging the additivity of Poisson processes, we extend the single‑site reconstruction algorithm to a multi‑site approach. On simulated data, this method can remove the smear effect induced by C14 within uncertainties, thereby recovering the energy resolution. This method can be applied to experiments such as the Jiangmen Underground Neutrino Observatory (JUNO) and the Jinping Neutrino Experiment (JNE) in the future to enhance the detector energy resolution.
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