Scintillation-only Based Pulse Shape Discrimination for Nuclear and Electron Recoils in Liquid Xenon
arXiv:1106.2209 · doi:10.1016/j.nima.2011.09.011
Abstract
In a dedicated test setup at the Kamioka Observatory we studied pulse shape discrimination (PSD) in liquid xenon (LXe) for dark matter searches. PSD in LXe was based on the observation that scintillation light from electron events was emitted over a longer period of time than that of nuclear recoil events, and our method used a simple ratio of early to total scintillation light emission in a single scintillation event. Requiring an efficiency of 50% for nuclear recoil retention we reduced the electron background to 7.7\pm1.1(stat)\pm1.2 0.6(sys)\times10-2 at energies between 4.8 and 7.2 keVee and to 7.7\pm2.8(stat)\pm2.5 2.8(sys)\times10-3 at energies between 9.6 and 12 keVee for a scintillation light yield of 20.9 p.e./keV. Further study was done by masking some of that light to reduce this yield to 4.6 p.e./keV, the same method results in an electron event reduction of 2.4\pm0.2(stat)\pm0.3 0.2(sys)\times10-1 for the lower of the energy regions above. We also observe that in contrast to nuclear recoils the fluctuations in our early to total ratio for electron events are larger than expected from statistical fluctuations.
25 pages, 15 figures
References in corpus (7)
- Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Likelihoods and Parameters from the WMAP data
- First results from DAMA/LIBRA and the combined results with DAMA/NaI
- Results from the Final Exposure of the CDMS II Experiment
- First Dark Matter Results from the XENON100 Experiment
- Liquid Xenon Detectors for Particle Physics and Astrophysics
- Simultaneous Measurement of Ionization and Scintillation from Nuclear Recoils in Liquid Xenon as Target for a Dark Matter Experiment
- Scintillation Pulse Shape Discrimination in a Two-Phase Xenon Time Projection Chamber
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- Discrimination of electronic recoils from nuclear recoils in two-phase xenon time projection chambers
- Kr calibration of the 2013 LUX dark matter search
- Liquid xenon scintillation measurements and pulse shape discrimination in the LUX dark matter detector
- Improving Photoelectron Counting and Particle Identification in Scintillation Detectors with Bayesian Techniques
- A measurement of the time profile of scintillation induced by low energy gamma-rays in liquid xenon with the XMASS-I detector
- Precision measurements of the scintillation pulse shape for low-energy recoils in liquid xenon
- Fast and Flexible Analysis of Direct Dark Matter Search Data with Machine Learning
- The Impact of Photon Flight Path on S1 Pulse Shape Analysis in Liquid Xenon Two-phase Detectors
- Liquid Xenon detector R&D for search (KamXP)