Abstract
Spatial resolution of less than 200μm is challenging for thermal neutron detection. A novel readout scheme based on the time-projection-chamber (TPC) concept is used in a gaseous electron multiplier (GEM) detector [1]. Thermal neutrons are captured in a single 2μm thick Boron-10 converter cathode and secondary Helium and Lithium ions are produced with a combined energy of 2.8MeV. These ions have sufficient energy to form straight tracks of several mm length. With a time resolving 2-dimensional readout of 400μm pitch in both directions, based on APV25 chips, the ions are tracked and their respective origin in the cathode converter foil is reconstructed. Using an Ar–CO2 93:7% gas mixture, a resolution of 100μm (FWHM 235μm) has been observed with a triple GEM-detector setup at the Garching neutron source (FRMII) for neutrons of 4.7Å.
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