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

被引：23

作者：

Brown, J. A. ^{[1
]}

Goldblum, B. L. ^{[1
]}

Bernstein, L. A. ^{[2
]}

Bleuel, D. L. ^{[2
]}

Brickner, N. M. ^{[1
]}

Caggiano, J. A. ^{[2
]}

Daub, B. H. ^{[1
]}

Kaufman, G. S. ^{[1
]}

Hatarik, R. ^{[2
]}

Phillips, T. W. ^{[2
]}

Wender, S. A. ^{[3
]}

van Bibber, K. ^{[1
]}

Vujic, J. ^{[1
]}

Zaitseva, N. P. ^{[2
]}

机构：

[1] Univ Calif Berkeley, Dept Nucl Engn, Berkeley, CA 94720 USA

[2] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA

[3] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

来源：

JOURNAL OF APPLIED PHYSICS | 2014年 / 115卷 / 19期

关键词：

TIME;

D O I：

10.1063/1.4878238

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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. (C) 2014 AIP Publishing LLC.

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