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Title: Surface purity control during XMASS detector refurbishment

The XMASS project aims at detecting dark matter, pp and {sup 7}Be solar neutrinos, and neutrino less double beta decay using large volume of pure liquid xenon. The first physics target of the XMASS project is to detect dark matter with 835 kg liquid xenon. After the commissioning runs, XMASS detector was refurbished to minimize the background contribution mainly from PMT sealing material and we restarted data taking in November 2013. We report how we control surface purity, especially how we prevent radon daughter accumulation on the detector copper surface, during XMASS detector refurbishment. The result and future plan of XMASS are also reported.
Authors:
 [1] ;  [2]
  1. Kamioka observatory, Institute for Cosmic Ray Research, the University of Tokyo, Higashi-Mozumi, Kamioka, Hida, Gifu, 506-1205 (Japan)
  2. (WPI), the University of Tokyo, Kashiwa, Chiba, 277-8582 (Japan)
Publication Date:
OSTI Identifier:
22488705
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1672; Journal Issue: 1; Conference: LRT 2015: 5. international workshop in low radioactivity techniques, Seattle, WA (United States), 18-20 Mar 2015; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BERYLLIUM 7; COPPER; DOUBLE BETA DECAY; LIQUID SCINTILLATION DETECTORS; LIQUIDS; NONLUMINOUS MATTER; PHOTOMULTIPLIERS; PROTONS; RADON; SOLAR NEUTRINOS; SURFACES; XENON