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Title: Measurement of ortho-positronium properties in liquid scintillators

Pulse shape discrimination in liquid scintillator detectors is a well-established technique for the discrimination of heavy particles from light particles. Nonetheless, it is not efficient in the separation of electrons and positrons, as they give rise to indistinguishable scintillator responses. This inefficiency can be overtaken through the exploitation of the formation of ortho-Positronium (o-Ps), which alters the time profile of light pulses induced by positrons. We characterized the o-Ps properties in the most commonly used liquid scintillators, i.e. PC, PXE, LAB, OIL and PC + PPO. In addition, we studied the effects of scintillator doping on the o-Ps properties for dopants currently used in neutrino experiments, Gd and Nd. Further measurements for Li-loaded and Tl-loaded liquid scintillators are foreseen. We found that the o-Ps properties are suitable for enhancing the electron-positron discrimination.
Authors:
; ;  [1] ;  [2] ; ;  [3] ; ;  [4]
  1. Laboratoire AstroParticule et Cosmologie, Paris (France)
  2. Department of Aerospace Science and Technology, Politecnico di Milano (Italy)
  3. Brookhaven National Laboratory (United States)
  4. IPHC, Université de Strasbourg (France)
Publication Date:
OSTI Identifier:
22218177
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1549; Journal Issue: 1; Conference: LRT 2013: 4. international workshop on low radioactivity techniques, Assergi (Italy), 10-12 Apr 2013; Other Information: (c) 2013 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; 74 ATOMIC AND MOLECULAR PHYSICS; DOPED MATERIALS; ELECTRONS; LIQUID SCINTILLATION DETECTORS; LIQUID SCINTILLATORS; LIQUIDS; NEUTRINOS; PARTICLE DISCRIMINATION; POSITRONIUM; POSITRONS; PULSE SHAPERS; VISIBLE RADIATION