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Title: Quenching measurements and modeling of a boron-loaded organic liquid scintillator

We present that organic liquid scintillators are used in a wide variety of applications in experimental nuclear and particle physics. Boron-loaded scintillators are particularly useful for detecting neutron captures, due to the high thermal neutron capture cross section of 10B. These scintillators are commonly used in neutron detectors, including the DarkSide-50 neutron veto, where the neutron may produce a signal when it scatters off protons in the scintillator or when it captures on 10B. Reconstructing the energy of these recoils is complicated by scintillation quenching. Understanding how nuclear recoils are quenched in these scintillators is an important and difficult problem. In this article, we present a set of measurements of neutron-induced proton recoils in a boron-loaded organic liquid scintillator at recoil energies ranging from 57–467 keV, and we compare these measurements to predictions from different quenching models. We find that a modified Birks' model whose denominator is quadratic in dE/dx best describes the measurements, with χ2/NDF=1.6. In conclusion, this result will help model nuclear recoil scintillation in similar detectors and can be used to improve their neutron tagging efficiency.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [3] ;  [5] ;  [6] ;  [5] ;  [6] ;  [7] ;  [8] ;  [6] ;  [6] ;  [9] ;  [9] ;  [6]
  1. Princeton Univ., NJ (United States). Department of Physics; Carleton Univ., Ottawa, ON (Canada). Department of Physics
  2. Princeton Univ., NJ (United States). Department of Physics; Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Princeton Univ., NJ (United States). Department of Physics
  4. Princeton Univ., NJ (United States). Department of Physics; Imperial College, London (United Kingdom). Department of High Energy Physics, Blackett Laboratory
  5. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  6. Univ. of Notre Dame, IN (United States). Department of Physics
  7. Univ. of Notre Dame, IN (United States). Department of Physics; Sun Yat-Sen University, Zhuhai (China). Sino-French Institute of Nuclear Engineering and Technology
  8. Univ. of Notre Dame, IN (United States). Department of Physics; Nuclear Physics Division, BARC, Mumbai (India)
  9. Univ. of Notre Dame, IN (United States). Department of Physics; Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Laboratory
Publication Date:
Report Number(s):
LLNL-JRNL-738009
Journal ID: ISSN 1748-0221
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Journal of Instrumentation
Additional Journal Information:
Journal Volume: 12; Journal Issue: 8; Journal ID: ISSN 1748-0221
Publisher:
Institute of Physics (IOP)
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 36 MATERIALS SCIENCE
OSTI Identifier:
1426120