Spectroscopy and Imaging Performance of the Liquid Xenon Gamma-Ray Imaging Telescope (LXeGRIT)
Abstract
LXeGRIT is a balloon-borne Compton telescope based on a liquid xenon time projection chamber (LXeTPC) for imaging cosmic -rays in the energy band of 0.2-20 MeV. The detector, with 400 cm2 area and 7 cm drift gap, is filled with high purity LXe. Both ionization and scintillation light signals are detected to measure the energy deposits and the three spatial coordinates of individual -ray interactions within the sensitive volume. The TPC has been characterized with repeated measurements of its spectral and Compton imaging response to -rays from radioactive sources such as , , and Am-Be. The detector shows a linear response to -rays in the energy range 511 keV -4.4 MeV, with an energy resolution (FWHM) of E/E=8.8% \: 1 /E. Compton imaging of -ray events with two detected interactions is consistent with an angular resolution of 3 degrees (RMS) at 1.8 MeV.
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