Sub-GeV events energy reconstruction with 3-inch PMTs in JUNO

TL;DR

This paper introduces a new energy reconstruction method for the JUNO detector using 3-inch PMTs and hit occupancy data, effectively covering energies from 10 MeV to 1 GeV for various neutrino physics applications.

Contribution

A novel energy reconstruction algorithm utilizing hit occupancy from 3-inch PMTs in JUNO, validated across a broad energy range for multiple neutrino physics goals.

Findings

Accurate energy reconstruction demonstrated from 10 MeV to 1 GeV.

Validated with electron Monte Carlo samples.

Effective for diverse neutrino detection applications.

Abstract

A 20-kiloton liquid scintillator detector is designed in the Jiangmen Underground Neutrino Observatory (JUNO) for multiple physics purposes, including the determination of the neutrino mass ordering through reactor neutrinos, as well as measuring supernova neutrinos, solar neutrinos, and atmosphere neutrinos to explore different physics topics. Efficient reconstruction algorithms are needed to achieve these physics goals in a wide energy range from MeV to GeV. In this paper, we present a novel method for reconstructing the energy of events using hit information from 25600 3-inch photomultiplier tubes (PMTs) and the OCCUPANCY method. Our algorithm exhibits good performance in accurate energy reconstruction, validated with electron Monte Carlo samples spanning kinetic energies from 10 MeV to 1 GeV.