The liquid scintillator is a special type of material that is designed to detect the faint signals produced by neutrinos. The scintillator is filled with a cocktail of organic compounds that are designed to absorb the energy produced by neutrinos. When a neutrino interacts with the scintillator, it produces a signal that is measured by the detector. The signal is then used to calculate the properties of the neutrino, including its mass.