Abstract
An underground laboratory (Aberdeen Tunnel Laboratory) was built inside a traffic tunnel (Aberdeen Tunnel) in the Hong Kong Island in the early 80ʼs for the study of cosmic-ray muon anisotropy. The laboratory has an overburden of about 250 m of rock, which is comparable to those of the detector halls proposed for the Daya Bay Neutrino Experiment in Guangdong Province, China. Given the very similar geographical location, the geology and background radiation to those in Daya Bay, the Aberdeen Tunnel Laboratory is an ideal testing ground for the Daya Bay Experiment. This project aims to study the neutrons initiated from cosmic muons by detecting the neutrons with a 0.5 ton neutron detector comprising of Gd-doped liquid scintillators viewed by PMTs. The events will be triggered by a muon tracker consisting of 3 horizontal layers of crossed stainless steel proportional counters and plastic scintillators, with 2 layers above and 1 layer below the neutron detector. It is hoped that the results will help in understanding and minimizing the neutron background in Gd-doped liquid scintillator based neutrino detectors. This paper presents an overview of the laboratory, the geology and radiation background, and the proposed detectors.
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