High-order angular correlation of californium-252 fission neutrons and the effect of detector cross-talk
High-order angular correlation of californium-252 fission neutrons and the effect of detector cross-talk
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锎252裂变中子的高阶角相关性及探测器串扰的影响
DOI:
10.1016/j.nima.2019.01.092
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发表时间:
2020
期刊:
影响因子:
--
通讯作者:
Joyce M
中科院分区:
文献类型:
--
作者:
Joyce M
High-order angular correlations of fast neutrons emitted by spontaneous fission in californium-252 (252 Cf) have been measured with a 2D array of 15 EJ-309 organic liquid scintillation detectors. These are compared with the results of Geant4 simulations using both an uncorrelated, average fission model and correlated fission models, which have also been used to quantify the impact of detector cross-talk on these distributions. In general, a bipolar trend is observed up to and including quadruple events, that is, θ 12, θ 13 and θ 14. A bias as θ→ 0∘ in these data is observed that is consistent with the expectation of cross-talk being more prevalent for nearest-neighbour detectors. This is observed to be reduced for higher orders (θ 13 and θ 14 relative to θ 12) and for wider gate widths (25 ns rather than 10 ns), consistent with this phenomenon being cross-talk. For the case of θ 13, each of the composite angular distributions for the 14 detector positions 2 4∘≤ θ≤ 33 6∘ have also been derived: a variation from a bipolar trend to a more isotropic behaviour, accompanied by a reduction in the relative level of response, is observed in these data for detector angles orthogonal to the reference detector at 0∘ consistent with the majority of neutrons being emitted from accelerated fragments. This research constitutes an important step towards quantifying and managing cross-talk as arrays of organic scintillators attract interest for practical applications such as nuclear materials assay.
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DOI:
--
发表时间:
1948
期刊:
影响因子:
--
作者:
S. Debenedetti;J. E. Francis;W. M. Preston;T. Bonner
通讯作者:
T. Bonner
DOI:
--
发表时间:
2014
期刊:
影响因子:
--
作者:
J. Randrup;R. Vogt
通讯作者:
R. Vogt
DOI:
--
发表时间:
1947
期刊:
影响因子:
--
作者:
R. R. Wilson
通讯作者:
R. R. Wilson
影响因子:
64.8
作者:
L. Meitner;O. Frisch
通讯作者:
L. Meitner;O. Frisch
影响因子:
2.7
作者:
O. Litaize;O. Serot;L. Berge
通讯作者:
L. Berge