Unfolding neutron spectra from water-pumping-injection multilayered concentric sphere neutron spectrometer using self-adaptive differential evolution algorithm

Rui Li; Jian-Bo Yang; Xian-Guo Tuo; Jie Xu; Rui Shi

doi:10.1007/s41365-021-00864-4

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Unfolding neutron spectra from water-pumping-injection multilayered concentric sphere neutron spectrometer using self-adaptive differential evolution algorithm

NUCLEAR ELECTRONICS AND INSTRUMENTATION | Updated：2021-03-31

- Unfolding neutron spectra from water-pumping-injection multilayered concentric sphere neutron spectrometer using self-adaptive differential evolution algorithm
- Nuclear Science and Techniques Vol. 32, Issue 3, Article number: 26(2021)
- Affiliations：
  
  1.Chengdu University of Technology, Chengdu 610059, China
  2.Sichuan University of Science and Engineering, Zigong 643000, China
  3.Applied Nuclear Technology in Geosciences Key Laboratory of Sichuan Province, Chengdu 610059, China
- Author bio：
  
  Corresponding author, yjb@cdut.edu.cn
- Funds：
- DOI：10.1007/s41365-021-00864-4
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Rui Li, Jian-Bo Yang, Xian-Guo Tuo, et al. Unfolding neutron spectra from water-pumping-injection multilayered concentric sphere neutron spectrometer using self-adaptive differential evolution algorithm. [J]. Nuclear Science and Techniques 32(3):26(2021)
DOI：

Rui Li, Jian-Bo Yang, Xian-Guo Tuo, et al. Unfolding neutron spectra from water-pumping-injection multilayered concentric sphere neutron spectrometer using self-adaptive differential evolution algorithm. [J]. Nuclear Science and Techniques 32(3):26(2021) DOI： 10.1007/s41365-021-00864-4.

摘要

Abstract

A self-adaptive differential evolution neutron spectrum unfolding algorithm (SDENUA) is established in this study to unfold the neutron spectra obtained from a water-pumping-injection multilayered concentric sphere neutron spectrometer (WMNS). Specifically, the neutron fluence bounds are estimated to accelerate the algorithm convergence, and the minimum error between the optimal solution and input neutron counts with relative uncertainties is limited to 10,-6, to avoid unnecessary calculations. Furthermore, the crossover probability and scaling factor are self-adaptively controlled. FLUKA Monte Carlo is used to simulate the readings of the WMNS under (1) a spectrum of Cf-252 and (2) its spectrum after being moderated, (3) a spectrum used for boron neutron capture therapy, and (4) a reactor spectrum. Subsequently, the measured neutron counts is unfolded using the SDENUA. The uncertainties of the measured neutron count and the response matrix are considered in the SDENUA, which does not require complex parameter tuning or an a priori default spectrum. The results indicate that the solutions of the SDENUA agree better with the IAEA spectra than those of MAXED and GRAVEL in UMG 3.1, and the errors of the final results calculated using the SDENUA are less than 12%. The established SDENUA can be used to unfold spectra from the WMNS.

关键词

Keywords

Water-pumping-injection multilayered spectrometerNeutron spectrum unfoldingDifferential evolution algorithmSelf-Adaptive control

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Applied Nuclear Technology in Geosciences Key Laboratory of Sichuan Province, Chengdu University of Technology

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