Scintillation response of Ga2O3 excited by laser accelerated ultra-high dose rate proton beam

TL;DR

This study investigates how ultra-high dose rate proton beams generated by laser acceleration affect the scintillation properties of {eta}-Ga2O3, revealing a significant decrease in decay time due to enhanced nonradiative processes.

Contribution

It demonstrates the impact of laser-accelerated high dose rate proton beams on the scintillation decay time of {eta}-Ga2O3, highlighting a novel method to study luminescent properties under extreme conditions.

Findings

Decay time of {eta}-Ga2O3 decreases by a factor of two at high dose rates.

High dose rate protons increase nonradiative recombination processes.

Potential for studying other scintillators with laser-accelerated proton beams.

Abstract

The temporal and spectral profile of \b{eta}-Ga2O3 excited by ultra-high dose rate proton beam has been investigated. The unique short bright and broad spectra characteristics of laser-accelerated protons were utilized to investigate the scintillation response difference under different dose rate. Our results indicate that for sufficiently high dose rate delivered, the average decay time of \b{eta}-Ga2O3 decreases by a factor of two. The overlap of carriers generated by high dose rate protons enhances the nonradiative recombination like Auger recombination and exciton-exciton annihilation which shortens the decay time significantly. The study opens up new avenues for investigating the luminescent properties of other scintillator materials using laser-accelerated high dose rate proton beams.