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Neutron background measurements with a hybrid neutron detector at the Kuo-Sheng Reactor Neutrino Laboratory

Authors :
M. Deniz
Shin-Ted Lin
İbrahim Yildirim
G. Asryan
M. Agartioglu
Mehmet Zeyrek
B. Sevda
Arun Kumar Soma
S. Kerman
L. Singh
Anil Sonay
Junbo Li
Jing-Han Chen
V. D. Sharma
Manoj Kumar Singh
Hau-Bin Li
V. Singh
S.W. Yang
Henry T. Wong
Qian Yue
F. K. Lin
Source :
Physical Review C. 98
Publication Year :
2018
Publisher :
American Physical Society (APS), 2018.

Abstract

We report in situ neutron background measurements at the Kuo-Sheng Reactor Neutrino Laboratory (KSNL) by a hybrid neutron detector (HND) with a data size of 33.8 days under identical shielding configurations as during the neutrino physics data taking. The HND consists of BC-501A liquid and BC-702 phosphor powder scintillation neutron detectors, which is sensitive to both fast and thermal neutrons, respectively. Neutron-induced events for the two channels are identified and differentiated by pulse shape analysis, such that background of both are simultaneously measured. The fast neutron fluxes are derived by an iterative unfolding algorithm. Neutron induced background in the germanium detector under the same fluxes, both due to cosmic-rays and ambient radioactivity, are derived and compared with the measurements. The results are valuable to background understanding of the neutrino data at the KSNL. In particular, neutron-induced background events due to ambient radioactivity as well as from reactor operation are negligible compared to intrinsic cosmogenic activity and ambient $\gamma$-activity. The detector concept and analysis procedures are applicable to neutron background characterization in similar rare-event experiments.<br />Comment: 12 pages, 29 figures

Details

ISSN :
24699993 and 24699985
Volume :
98
Database :
OpenAIRE
Journal :
Physical Review C
Accession number :
edsair.doi.dedup.....0eaabd70cecddd05aebddff7db147eff
Full Text :
https://doi.org/10.1103/physrevc.98.024602