Light propagation and fluorescence quantum yields in liquid scintillators

TL;DR

This paper investigates the optical properties and quantum yields of liquid scintillators, providing essential data for accurate simulation of light propagation in large detectors.

Contribution

It presents new measurements of absorption, emission spectra, and quantum yields for key scintillator molecules, enhancing modeling accuracy.

Findings

Absorption and emission spectra characterized for PPO and bis-MSB.

Quantum yields measured for various aromatic molecules.

Data improves simulation of scintillation light in detectors.

Abstract

For the simulation of the scintillation and Cherenkov light propagation in large liquid scintillator detectors a detailed knowledge about the absorption and emission spectra of the scintillator molecules is mandatory. Furthermore reemission probabilities and quantum yields of the scintillator components influence the light propagation inside the liquid. Absorption and emission properties are presented for liquid scintillators using 2,5-Diphenyloxazole (PPO) and 4-bis-(2-Methylstyryl)benzene (bis-MSB) as primary and secondary wavelength shifter. New measurements of the quantum yields for various aromatic molecules are shown.