Details

Autor(en) / Beteiligte

• Manalaysay, A.
• Undagoitia, T. Marrodán
• Askin, A.
• Baudis, L.
• Behrens, A.
• Ferella, A. D.
• Kish, A.
• Lebeda, O.
• Santorelli, R.
• Vénos, D.
• Vollhardt, A.

Titel

Spatially uniform calibration of a liquid xenon detector at low energies using K 83 m r

Ist Teil von

• Review of scientific instruments, 2010-07, Vol.81 (7), p.073303-073303-8

Ort / Verlag

American Institute of Physics

Erscheinungsjahr

2010

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• A difficult task with many particle detectors focusing on interactions below ∼ 100   keV is to perform a calibration in the appropriate energy range that adequately probes all regions of the detector. Because detector response can vary greatly in various locations within the device, a spatially uniform calibration is important. We present a new method for calibration of liquid xenon (LXe) detectors, using the short-lived K 83 m r . This source has transitions at 9.4 and 32.1 keV, and as a noble gas like Xe, it disperses uniformly in all regions of the detector. Even for low source activities, the existence of the two transitions provides a method of identifying the decays that is free of background. We find that at decreasing energies, the LXe light yield increases, while the amount of electric field quenching is diminished. Additionally, we show that if any long-lived radioactive backgrounds are introduced by this method, they will present less than 67 × 10 − 6   events   kg − 1   day − 1   keV − 1 in the next generation of LXe dark matter direct detection searches.