Abstract
Triple Gas Electron Multipliers (GEM) for slow and fast neutrons were employed at the n_TOF facility at CERN as online beam imaging monitors and for energy spectra measurements via the time-of-flight technique. The detectors were exposed to the neutron spectrum ranging from thermal to 1GeV, produced by spallation of 20GeV/c protons in a lead target with a maximum intensity of 7·1012 protons per pulse. The spectrum and the 2D count distribution of the neutron beam were measured and compared at two distances from the target, 185m and 200m. The detectors showed radiation hardness, linear response and the ability to monitor the beam profile online with high spatial resolution.
Highlights
Neutron time-of-flight facilities such as n_TOF [1] at CERN and LANSCE [2] at LANL are commonly employed for studying neutron induced reactions for nuclear structure and reaction physics [3], astrophysics [4], nuclear technology [5] and detector characterization [6]
Measurements with Gas Electron Multipliers (GEM) B4C were performed in two stages: 200 slices of 0.05 ms each were acquired in the range 2 eV to 10 MeV and 400 slices from thermal energy to 2 eV with a gate of 0.5 ms
Three triple GEM detectors with different active area and readout pad size were employed for measuring the energy spectrum and spot dimensions of the neutron beam at CERN n_TOF facility
Summary
Neutron time-of-flight facilities such as n_TOF [1] at CERN and LANSCE [2] at LANL are commonly employed for studying neutron induced reactions for nuclear structure and reaction physics [3], astrophysics [4], nuclear technology [5] and detector characterization [6]. These facilities typically feature white neutron sources produced by spallation through protons impinging on heavy targets. The spectrum shows an intense evaporation peak at 1 MeV, a high energy peak at 100 MeV and a thermal peak with lower intensity
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