Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2018, Vol. 29 ›› Issue (8): 118

• NUCLEAR ELECTRONICS AND INSTRUMENTATION •

Optimization study on neutron spectrum unfolding based on the least-squares method

Hong-Hu Song, Yong-Gang Yuan, Tai-Ping Peng, Yang Yang, Yong-Gang Mo, Jing Wu

1. Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China
• Contact: Hong-Hu Song E-mail:songhg10@lzu.edu.cn
• Supported by:
This work was supported by the Funding Agency ITER (No. 2014GB11204).
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Hong-Hu Song, Yong-Gang Yuan, Tai-Ping Peng, Yang Yang, Yong-Gang Mo, Jing Wu. Optimization study on neutron spectrum unfolding based on the least-squares method.Nuclear Science and Techniques, 2018, 29(8): 118
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Abstract:

The response functions and pulse height spectrum (PHS) of a 2'' × 2'' BC501A detector were obtained through a general-purpose Monte Carlo simulation toolkit, Geant4. A relatively simple but effective method was adopted to unfold the PHS. Recommendations regarding the response matrix were proposed to optimize the unfolding results. The results indicate that the accuracy of the unfolding can be greatly improved using many incident neutrons with a wide energy range, a proper energy interval, and an appropriate channel width of the response matrix. The above-mentioned method was verified by unfolding three different types of simulated spectrum, the results of which are in good accord with the simulated distribution.