# Neutrino Physics with an Opaque Detector

## TL;DR

This paper introduces LiquidO, a novel neutrino detection method using an opaque scintillator and optical fibers, enabling high-resolution imaging and improved particle identification over traditional transparent detectors.

## Contribution

The paper presents a new neutrino detection technique that departs from transparency, using an opaque medium with dense optical fibers for enhanced imaging and particle identification.

## Key findings

- Successful experimental validation of the LiquidO concept
- High-resolution imaging capability demonstrated
- Potential for new neutrino physics opportunities

## Abstract

In 1956 Reines & Cowan discovered the neutrino using a liquid scintillator detector. The neutrinos interacted with the scintillator, producing light that propagated across transparent volumes to surrounding photo-sensors. This approach has remained one of the most widespread and successful neutrino detection technologies used since. This article introduces a concept that breaks with the conventional paradigm of transparency by confining and collecting light near its creation point with an opaque scintillator and a dense array of optical fibres. This technique, called LiquidO, can provide high-resolution imaging to enable efficient identification of individual particles event-by-event. A natural affinity for adding dopants at high concentrations is provided by the use of an opaque medium. With these and other capabilities, the potential of our detector concept to unlock opportunities in neutrino physics is presented here, alongside the results of the first experimental validation.