Low-energy neutral-particle detection in the Mont Blanc LSD experiment

Physics

Scientific paper

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Antineutrinos, Background Radiation, Cosmic Ray Showers, Elementary Particle Interactions, Neutral Particles, Neutrinos, Scintillation Counters, Energy Spectra, Fast Neutrons, Gamma Rays, Muons, Nuclear Capture, Nuclear Fission, Radioactive Decay, Thermal Neutrons

Scientific paper

The detection of positrons (at energy threshold 7 MeV) and neutrons (at 800 keV) from the capture of low-energy stellar-collapse neutrinos in the liquid-scintillation-detector (LSD) experiment at Mont Blanc Laboratory is examined analytically, with a focus on background sources imitating the antineutrino interaction. The experimental setup and the calibration results are summarized, and the neutral-particle background in the LSD is characterized on the basis of preliminary data. It is found that fast neutrons from muon-induced nuclear showers in the rock, spontaneous fission of U-238, and the decay of isotopes produced in the rock or the apparatus by thermal neutron capture are the primary background sources.

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