Oxygen quenching in LAB based liquid scintillator and nitrogen bubbling model

TL;DR

This study investigates oxygen quenching in LAB-based liquid scintillator and introduces a nitrogen bubbling model to describe how nitrogen purging improves light yield by reducing oxygen quenching effects.

Contribution

It presents a new nitrogen bubbling model that correlates bubbling time with the reduction of oxygen quenching in LAB scintillator.

Findings

Light yield increases by 11% after nitrogen purging.

A simple model describes the relationship between bubbling time and light yield.

Oxygen quenching can be effectively mitigated through nitrogen bubbling.

Abstract

The oxygen quenching effect in Linear Alkl Benzne (LAB) based liquid scintillator (LAB as the solvent, 3 g/L 2, 5 diphe-nyloxazole (PPO) as the fluor and 15 mg/L $p$-bis-($o$-methylstyryl)-benzene (bis-MSB) as the $\lambda$-shifter) is studied by measuring the light yield as the function of the nitrogen bubbling time. It is shown that the light yield of the fully purged liquid scintillator is increased by 11% at the room temperature and the room atmosphere pressure. A simple nitrogen bubbling model is proposed to describe the relationship between the relative light yield (oxygen quenching factor) and the bubbling time.