# A new method of energy reconstruction for large spherical liquid scintillator detectors

## TL;DR

This paper introduces a novel, model-independent energy reconstruction method for large liquid scintillator detectors like JUNO, effectively addressing optical complexities and reducing calibration needs to achieve high energy resolution.

## Contribution

A new energy reconstruction approach that minimizes calibration requirements and handles complex optical effects in large liquid scintillator detectors.

## Key findings

- Energy non-uniformity controlled below 1%
- Method validated with JUNO's software
- Supports achieving 3% energy resolution

## Abstract

Liquid scintillators are commonly used to detect low energy neutrinos from the reactors, sun, and earth. It is a challenge to reconstruct deposited energies for a large liquid scintillator detector. For detectors with multiple optical mediums such as JUNO and SNO+, the prediction of the propagation of detected photons is extremely difficult due to mixed optical processes such as Rayleigh scattering, refraction and total reflection at their boundaries. Calibration based reconstruction methods consume impractical time since a large number of calibration points are required in a giant detector. In this paper, we propose a new model-independent method to reconstruct deposited energies with minimum requirements on the calibration system. This method is validated with JUNO's offline software. Monte Carlo studies show that the energy non-uniformity can be controlled below 1%, which is crucial for JUNO to achieve 3% energy resolution.