Tritium calibration of the LUX dark matter experiment
LUX Collaboration: D. S. Akerib, H. M. Ara\'ujo, X. Bai, A. J. Bailey,, J. Balajthy, P. Beltrame, E. P. Bernard, A. Bernstein, T. P. Biesiadzinski,, E. M. Boulton, A. Bradley, R. Bramante, S. B. Cahn, M. C. Carmona-Benitez, C., Chan, J. J. Chapman, A. A. Chiller, C. Chiller
TL;DR
This paper details the calibration of the LUX dark matter detector using tritium decays, providing key measurements of electron-recoil responses, yields, and recombination, crucial for improving dark matter search sensitivity.
Contribution
It presents the first detailed tritium calibration of LUX, including energy spectrum reconstruction, yield measurements, and ER band analysis, enhancing dark matter detection accuracy.
Findings
Good agreement between measured and expected energy spectra
Measured charge and light yields at specified electric fields
Insights into charge recombination and ER band characteristics
Abstract
We present measurements of the electron-recoil (ER) response of the LUX dark matter detector based upon 170,000 highly pure and spatially-uniform tritium decays. We reconstruct the tritium energy spectrum using the combined energy model and find good agreement with expectations. We report the average charge and light yields of ER events in liquid xenon at 180 V/cm and 105 V/cm and compare the results to the NEST model. We also measure the mean charge recombination fraction and its fluctuations, and we investigate the location and width of the LUX ER band. These results provide input to a re-analysis of the LUX Run3 WIMP search.
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