Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994phdt........23c&link_type=abstract
PhD Dissertation, Columbia Univ. Dobbs Ferry, NY United States
Astronomy and Astrophysics
Astronomy
1
Gamma Ray Telescopes, Astronomical Spectroscopy, Imaging Techniques, Ionization Chambers, Scintillation Counters, Xenon, Liquefied Gases, Gamma Ray Astronomy
Scientific paper
The experiment LXe-CAT (Liquid Xenon-Coded Aperture Telescope), which we have proposed for gamma-ray astrophysical observations in the 0.3-10 MeV energy range, uses a Liquid Xenon Time Projection Chamber (LXe-TPC) as a three-dimensional position sensitive gamma-ray detector, and a coded aperture mask to provide a telescope with an angular resolution of 30 arcmin over a field-of-view (FOV) of 19 deg x 19 deg and a point source localization accuracy of 2 arcmin for a 10 sigma source. To demonstrate the spectroscopy and imaging capabilities of the LXe-TPC as a gamma-ray detector we have designed, built, and successfully tested a 10 liter prototype with a sensitive area of approximately 400 sq cm and an active liquid depth of 5 cm. Studies on gain stability, spectroscopy, and imaging response of this detector to various gamma-ray sources are presented. The unique capability of the LXe-TPC to identify and reject background events based on Compton kinematics reconstruction has also been demonstrated. The astrophysical observations that stimulated the development of the proposed telescope are also considered.
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