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Title: Relative light yield and temporal response of a stilbene-doped bibenzyl organic scintillator for neutron detection

The neutron time-of-flight (nTOF) diagnostics used to characterize implosions at the National Ignition Facility (NIF) has necessitated the development of novel scintillators that exhibit a rapid temporal response and high light yield. One such material, a bibenzyl-stilbene mixed single-crystal organic scintillator grown in a 99.5:0.5 ratio in solution, has become the standard scintillator used for nTOF diagnostics at NIF. The prompt fluorescence lifetime and relative light yield as a function of proton energy were determined to calibrate this material as a neutron detector. The temporal evolution of the intensity of the prompt fluorescent response was modeled using first-order reaction kinetics and the prompt fluorescence decay constant was determined to be 2.46 ± 0.01 (fit) ± 0.13 (systematic) ns. The relative response of the bibenzyl-stilbene mixed crystal generated by recoiling protons was measured, and results were analyzed using Birks' relation to quantify the non-radiative quenching of excitation energy in the scintillator.
Authors:
; ; ; ; ; ;  [1] ; ; ; ; ; ;  [2] ;  [3]
  1. Department of Nuclear Engineering, University of California, Berkeley, California 94720 (United States)
  2. Lawrence Livermore National Laboratory, Livermore, California 94551 (United States)
  3. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
Publication Date:
OSTI Identifier:
22275536
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 19; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; BIBENZYL; DOPED MATERIALS; EXCITATION; FLUORESCENCE; LIFETIME; MONOCRYSTALS; NEUTRON DETECTION; PHOSPHORS; PLASMA DIAGNOSTICS; PROTONS; REACTION KINETICS; SOLID SCINTILLATION DETECTORS; STILBENE; TIME-OF-FLIGHT METHOD; US NATIONAL IGNITION FACILITY; VISIBLE RADIATION