Abstract
The J-PARC E56 experiment aims to search for sterile neutrinos at the J-PARC Materials and Life Science Experimental Facility (MLF). In order to examine the feasibility of the experiment, we measured the background rates of different detector candidate sites, which are located at the third floor of the MLF, using a detector consisting of plastic scintillators with a fiducial mass of 500 kg. The gammas and neutrons induced by the beam as well as the backgrounds from the cosmic rays were measured, and the results are described in this article.
Highlights
We proposed a definite search for the existence of neutrino oscillations with m 2 near 1 eV2 at the
The 500 kg detector was moved to measure the backgrounds at each point
The fast neutron flux detected above 20 MeV was (1.28 ± 0.05) × 10−3 Hz, while the MC based on Ref. [13] gives a rate of 1.12 × 10−3 Hz
Summary
J-PARC Materials and Life Science Experimental Facility (MLF) [1]. With the 3 GeV Rapid Cycling. For the detection of the positron, which we call the “prompt signal region,” the energy is selected to be 20 < E < 60 MeV and the hit time of the activity inside the detector to be 1 < T < 10 μs, where T is the time from the proton beam start timing. These criteria are based on the features of the μD A R neutrinos. We used cosmic muons to calibrate the energy and timing and to measure the attenuation length of the scintillator.
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