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Title: Measurement of α -particle quenching in LAB based scintillator in independent small-scale experiments

The α -particle light response of liquid scintillators based on linear alkylbenzene (LAB) has been measured with three different experimental approaches. In the first approach, α -particles were produced in the scintillator via 12C(n,α) 9 Be reactions. In the second approach, the scintillator was loaded with 2 % of natSm providing an α-emitter, 147Sm, as an internal source. In the third approach, a scintillator flask was deployed into the water-filled SNO+ detector and the radioactive contaminants 222Rn, 218Po and 214Po provided the α -particle signal. The behavior of the observed α -particle light outputs are in agreement with each case successfully described by Birks’ law. The resulting Birks parameter kB ranges from (0.0066±0.0016) to (0.0076±0.0003) cm/MeV. In the first approach, the α -particle light response was measured simultaneously with the light response of recoil protons produced via neutron–proton elastic scattering. This enabled a first time a direct comparison of kB describing the proton and the α -particle response of LAB based scintillator. The observed kB values describing the two light response functions deviate by more than 5σ . The presented results are valuable for all current and future detectors, using LAB based scintillator as target, since they depend on anmore » accurate knowledge of the scintillator response to different particles.« less
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [2] ;  [8] ;  [9] ;  [10] ;  [11] ;  [2] ;  [3] ;  [12]
  1. Technical Univ. Dresden (Germany); Univ. of British Columbia, Vancouver, BC (Canada)
  2. Queen's Univ., Kingston, ON (Canada)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
  4. Helmholtz-Zentrum Dresden-Rossendorf (Germany)
  5. Helmholtz-Zentrum Dresden-Rossendorf (Germany); Technical Univ. Dresden (Germany)
  6. Queen's Univ., Kingston, ON (Canada); Laurentian Univ., Sudbury, ON (Canada)
  7. Technical Univ. Dresden (Germany); Karlsruhe Inst. of Technology (KIT) (Germany)
  8. Physikalisch-Technische Bundesanstalt, Braunschweig (Germany)
  9. Queen's Univ., Kingston, ON (Canada); Lancaster Univ. (United Kingdom)
  10. Univ. of Washington, Seattle, WA (United States)
  11. Univ. of London (United Kingdom)
  12. Technical Univ. Dresden (Germany)
Publication Date:
Report Number(s):
BNL-112083-2016-JAAM
Journal ID: ISSN 1434-6044
Grant/Contract Number:
SC0012704
Type:
Published Article
Journal Name:
European Physical Journal. C, Particles and Fields
Additional Journal Information:
Journal Volume: 76; Journal Issue: 3; Journal ID: ISSN 1434-6044
Publisher:
Springer
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
OSTI Identifier:
1251763
Alternate Identifier(s):
OSTI ID: 1439848