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Scintillating and optical spectroscopy of Al2O3 : Ti for dark matter searches

Abstract : In order to optimize sapphire as a cryogenic scintillation-phonon detector for dark matter, Al2O3:Ti crystals with different concentrations of doping have been studied using continuous X-ray excitation in the 30–300 K temperature range. Light yields vary by 20% for Ti concentrations between 10 and 1000 ppm at room temperature; they roughly double as the crystals are cooled from room temperature to 45 K. From the analysis of the change in the X-ray luminescence spectra of Al2O3 with the concentration of Ti, it is concluded that the well-known blue emission of Ti-doped Al2O3 is due to the radiative decay of F-centers. Recommendations are given for improving the performance of Al2O3 scintillators.
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Contributor : Alexia Lucchi <>
Submitted on : Friday, September 25, 2009 - 11:36:06 AM
Last modification on : Wednesday, September 16, 2020 - 4:42:17 PM

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M. Luca, N. Coron, C. Dujardin, H. Kraus, V.B. Mikhailik, et al.. Scintillating and optical spectroscopy of Al2O3 : Ti for dark matter searches. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Elsevier, 2009, 606, pp.545-551. ⟨10.1016/j.nima.2009.04.034⟩. ⟨in2p3-00419888⟩

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