Discovery potential for supernova relic neutrinos with slow liquid scintillator detectors

TL;DR

This paper explores the potential of using slow liquid scintillator detectors, specifically linear alkyl benzene, to detect supernova relic neutrinos, offering a promising alternative to existing detection methods with comparable sensitivity.

Contribution

The study demonstrates that a kiloton-scale LAB detector can effectively detect supernova relic neutrinos, addressing background issues and providing a new detection approach.

Findings

A kiloton-scale LAB detector can detect supernova relic neutrinos within 10 years.

LAB's Cherenkov and scintillation light separation enhances particle identification.

Detection sensitivity is comparable to other large-volume neutrino detectors.

Abstract

Detection of supernova relic neutrinos could provide key support for our current understanding of stellar and cosmological evolution, and precise measurements of these neutrinos could yield novel insights into the universe. In this paper, we studied the detection potential of supernova relic neutrinos using linear alkyl benzene (LAB) as a slow liquid scintillator. The linear alkyl benzene features good separation of Cherenkov and scintillation lights, thereby providing a new route for particle identification. We further addressed key issues in current experiments, including (1) the charged current background of atmospheric neutrinos in water Cherenkov detectors and (2) the neutral current background of atmospheric neutrinos in typical liquid scintillator detectors. A kiloton-scale LAB detector at Jinping with $\mathcal{O}$(10) years of data could discover supernova relic neutrinos with a sensitivity comparable to that of large-volume water Cherenkov detectors, typical liquid scintillator detectors, and liquid argon detectors.