2017/11/30 by P. Sorensen, K. Kamdin · 3 citations
Physics and Astronomy · #Atomic and Subatomic Physics Research #Dark Matter and Cosmic Phenomena #Dark matter #Detector #Electric field #Electron #Limiting #Noise (video) #Particle physics theoretical and experimental studies #Xenon #astro-ph.IM #hep-ex #physics.ins-det
paper · pdf · doi:10.1088/1748-0221/13/02/p02032
published as 2018 JINST 13 P02032 · v2 includes a more elaborate introduction and a more comprehensive and broad interpretation of the unknown tau_2 component. Data and analysis unchanged from v1
arxiv created 2017/12/13 · openalex created_date 2018/01/05 · openalex publication_date 2018/02/27 · arxiv updated 2018/02/28 · openalex updated_date 2026/08/05
Single electron noise which persists for many milliseconds is known to follow ionizing events in liquid/gas xenon emission detectors. Due to the long timescale, this noise can be mistaken for a genuine signal. Therefore, it is a limiting background to the low-energy threshold of dark matter searches, and could prevent discovery-class searches for MeV scale hidden sector dark matter. A systematic study reveals distinct fast and slow components to the noise. The fast component is compatible with the hypothesis of electrons which were trapped below the liquid surface, and can be reduced by increasing the electric field across the liquid/gas interface. However, the slow component increases linearly with electric field. Hypotheses for the origin of this effect are discussed, and techniques for mitigation are suggested.