Experimental measurement finds 3.7% scintillation resolution at 511 keV in liquid xenon using high-PDE SiPMs, close to the 2.8% Poisson limit and compatible with 1.8% theoretical intrinsic resolution.
Gamma Ray Spectroscopy with Scintillation Light in Liquid Xenon
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abstract
Scintillation light from gamma ray irradiation in liquid xenon is detected by two Hamamatsu R9288 photomultiplier tubes (PMTs) immersed in the liquid. UV light reflector material, PTFE, is used to optimize the light collection efficiency. The detector gives a high light yield of 6 photoelectron per keV (pe/keV), which allows efficient detection of the 122 keV gamma-ray line from Co-57, with a measured energy resolution of (8.8+/-0.6)% (sigma). The best achievable energy resolution, by removing the instrumental fluctuations, from liquid xenon scintillation light is estimated to be around 6-8% (sigma) for gamma-ray with energy between 662 keV and 122 keV.
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Measurement of the scintillation resolution in liquid xenon and its impact for future segmented calorimeters
Experimental measurement finds 3.7% scintillation resolution at 511 keV in liquid xenon using high-PDE SiPMs, close to the 2.8% Poisson limit and compatible with 1.8% theoretical intrinsic resolution.