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Spectroscopy and Imaging Performance of the Liquid Xenon Gamma-Ray Imaging Telescope (LXeGRIT)

E. Aprile·A. Curioni·V. Egorov·K. -L. Giboni·U. G. Oberlack·; S. Ventura·; T. Doke·J. Kikuchi·K. Takizawa·; E. L. Chupp·P. P. Dunphy
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Abstract

LXeGRIT is a balloon-borne Compton telescope based on a liquid xenon time projection chamber (LXeTPC) for imaging cosmic \g-rays in the energy band of 0.2-20 MeV. The detector, with 400 cm$^2$ 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 \g -ray interactions within the sensitive volume. The TPC has been characterized with repeated measurements of its spectral and Compton imaging response to \g -rays from radioactive sources such as \na, \cs, \yt and Am-Be. The detector shows a linear response to \g -rays in the energy range 511 keV -4.4 MeV, with an energy resolution (FWHM) of $ ΔE/E=8.8% \: \sqrt{1\MeV /E}$. Compton imaging of \yt \g -ray events with two detected interactions is consistent with an angular resolution of $\sim$ 3 degrees (RMS) at 1.8 MeV.

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E. Aprile, A. Curioni, V. Egorov, K. -L. Giboni, U. G. Oberlack, ; S. Ventura, ; T. Doke, J. Kikuchi, K. Takizawa, ; E. L. Chupp, P. P. Dunphy. 2000-12-13. Spectroscopy and Imaging Performance of the Liquid Xenon Gamma-Ray Imaging Telescope (LXeGRIT). https://doi.org/10.1117/12.409129

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