Abstract
The signal from scintillator detector is approximately linear to the deposited energy. Even though it is mostly linear there are some deviations.
The knowledge of the nonlinearity is essential for the precise determination of the deposited energy in neutrino experiments using the liquid scintillator such as JUNO, multipurpose neutrino detector with rich physics program containing about 20 kton of liquid scintillator. The presented method of the nonlinearity measurement uses the process of Compton scattering where the gamma rays scatter inside the liquid scintillator.
Calibrated HPGe detector measures the energy of the scattered gamma rays with high precision. The signal from the HPGe detector and the known original energy of the gamma particle determine the true value of the deposited energy inside scintillator.
The examined nonlinearity is the deviation from the linear dependence of the liquid scintillator signal on the true deposited energy.