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

Journal Article · Wed May 21 00:00:00 EDT 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4878238· OSTI ID:22275536

Brown, J. A.; Brickner, N. M.; Daub, B. H.; Kaufman, G. S.; Bibber, K. van; Vujic, J. ^[1]; Bernstein, L. A.; Bleuel, D. L.; Caggiano, J. A.; Hatarik, R.; Phillips, T. W.; Zaitseva, N. P. ^[2]; Wender, S. A. ^[3]

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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)

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.

• OSTI ID: 22275536
• Journal Information: Journal of Applied Physics, Vol. 115, Issue 19; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

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