Title:

Improvements to the Technique for Measuring Low-Temperature Scintillation Properties

I present an improved method for measuring light yield and decay time of scintillators as a function of temperature. By leveraging the antiparallel gamma decay mechanism of Na-22, we ensure that all of the candidate events are 511keV γ-rays with nearly zero background. To demonstrate the efficacy of this method, I provide the results of a measurement done by Dr. Merlin Kole using this method on Cerium-doped Gadolinium Aluminum Gallium Garnet (GAGG:Ce), as well as an analysis of the results. This analysis revealed a previously-unknown change in both the fast and slow components of the decay time of GAGG:Ce between 120 and 150 Kelvin, for which I propose several potential explanations. This work opens up new possibilities in anticoincidence shielding for high-energy astrophysics experiments, such as the proposed soft X-ray telescope ASCENT.

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