Measurement of the relative neutron sensitivity curve of a LaBr3(Ce) scintillator based on the CSNS Back-n white neutron source

doi:10.1088/1674-1056/acca08

Abstract A scintillator detector consisting of a LaBr₃(Ce) (0.5%) scintillator, a photomultiplier tube (PMT), and an oscilloscope were used to study the neutron sensitivities of the LaBr₃(Ce) scintillator at the China Spallation Neutron Source (CSNS) Back-n white neutron source in the double-bunch and single-bunch operation modes, respectively. Under the two operational modes, the relative neutron sensitivity curves of the LaBr₃(Ce) scintillator in the energy regions of 1-20 MeV and 0.5-20 MeV were obtained for the first time. In the energy range of 1-20 MeV, the two curves were nearly identical. However the relative neutron sensitivity uncertainties of the double-bunch experiment were higher than those of the single-bunch experiment. The above results indicated that the single-bunch experiment's neutron sensitivity curve has a lower minimum measurable energy than the double-bunch experiment. Above the minimum measurable energy of the double-bunch experiment, there is little difference between the measured relative neutron sensitivity curves of the single-bunch and double-bunch experiments of the LaBr₃(Ce) scintillator and those of other scintillators with a similar neutron response signal intensity.

Keywords: relative neutron sensitivity LaBr₃(Ce) China Spallation Neutron Source (CSNS) white neutron source

Received: 30 October 2022
Revised: 31 March 2023
Accepted manuscript online: 04 April 2023

PACS:	07.85.Fv	(X- and γ-ray sources, mirrors, gratings, and detectors)
	29.40.Mc	(Scintillation detectors)
	78.70.Ps	(Scintillation)
	29.40.-n	(Radiation detectors)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11905196). The authors would like to thank their colleagues from CSNS for their support.

Corresponding Authors: Longtao Yi
E-mail: yilt2008@163.com

Cite this article:

Jian Liu(刘建), Dongming Wang(王东明), Yuecheng Fu(甫跃成), Zhongbao Li(李忠宝), Han Yi(易晗), and Longtao Yi(易龙涛) Measurement of the relative neutron sensitivity curve of a LaBr₃(Ce) scintillator based on the CSNS Back-n white neutron source 2023 Chin. Phys. B 32 100703

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Measurement of the relative neutron sensitivity curve of a LaBr3(Ce) scintillator based on the CSNS Back-n white neutron source

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Measurement of the relative neutron sensitivity curve of a LaBr₃(Ce) scintillator based on the CSNS Back-n white neutron source