The fast neutron rate is measured at the site of NEOS experiment, a short baseline neutrino experiment located in a tendon gallery of a commercial nuclear power plant, using a 0.78-liter liquid scintillator detector. A pulse shape discrimination technique is used to identify neutron signals. The measurements are performed during the nuclear reactor-on and off periods and found to be ~20 per day for both periods. The fast neutron rate is also measured at an overground site with a negligible overburden and is found to be ~100 times higher than that at the NEOS experiment site.
@article{arxiv.1610.05111,
title = {Measurement of Fast Neutron Rate for NEOS Experiment},
author = {Y. J. Ko and J. Y. Kim and B. Y. Han and C. H. Jang and E. J. Jeon and K. K. Joo and B. R. Kim and H. J. Kim and H. S. Kim and Y. D. Kim and Jaison Lee and J. Y. Lee and M. H. Lee and Y. M. Oh and H. K. Park and H. S. Park and K. S. Park and K. M. Seo and Kim Siyeon and G. M. Sun},
journal= {arXiv preprint arXiv:1610.05111},
year = {2017}
}