New Monte Carlo-based method to evaluate fission fraction uncertainties for the reactor antineutrino experiment

被引：2
|
作者：
Ma, X. B. [1 ]
Qiu, R. M. [1 ]
Chen, Y. X. [1 ]
机构：
[1] North China Elect Power Univ, Beijing 102206, Peoples R China
来源：
NUCLEAR PHYSICS A | 2017年 / 958卷
基金：
中国国家自然科学基金;
关键词：
Monte Carlo-based method; Fission fraction uncertainty; Reactor antineutrino experiment;
D O I：
10.1016/j.nuclphysa.2016.12.005
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
Uncertainties regarding fission fractions are essential in understanding antineutrino flux predictions in reactor antineutrino experiments. A new Monte Carlo-based method to evaluate the covariance coefficients between isotopes is proposed. The covariance coefficients are found to vary with reactor burnup and may change from positive to negative because of balance effects in fissioning. For example, between U-235 and (PU)-P-239, the covariance coefficient changes from 0.15 to 0.13. Using the equation relating fission fraction and atomic density, consistent uncertainties in the fission fraction and covariance matrix were obtained. The antineutrino flux uncertainty is 0.55%, which does not vary with reactor burnup. The new value is about 8.3% smaller. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码：211 / 218
页数：8
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