# Production and optical properties of liquid scintillator for the JSNS$^{2}$ experiment

## TL;DR

This paper details the production, optical characterization, and stability assessment of gadolinium-loaded liquid scintillator for the JSNS$^{2}$ neutrino experiment, demonstrating its suitability for long-term use in neutrino detection.

## Contribution

It presents the production process and optical property measurements of the LS, confirming its stability when stored in ISO tanks for the JSNS$^{2}$ experiment.

## Key findings

- LS produced at a refurbished facility meets optical requirements
- Storing LS in ISO tanks does not degrade optical properties
- Long-term stability of LS confirmed for experimental use

## Abstract

The JSNS$^{2}$ (J-PARC Sterile Neutrino Search at J-PARC Spallation Neutron Source) experiment will search for neutrino oscillations over a 24 m short baseline at J-PARC. The JSNS$^{2}$ inner detector will be filled with 17 tons of gadolinium-loaded liquid scintillator (LS) with an additional 31 tons of unloaded LS in the intermediate $\gamma$-catcher and outer veto volumes. JSNS$^{2}$ has chosen Linear Alkyl Benzene (LAB) as an organic solvent because of its chemical properties. The unloaded LS was produced at a refurbished facility, originally used for scintillator production by the RENO experiment. JSNS$^{2}$ plans to use ISO tanks for the storage and transportation of the LS. In this paper, we describe the LS production, and present measurements of its optical properties and long term stability. Our measurements show that storing the LS in ISO tanks does not result in degradation of its optical properties.