A Compact Liquid Xenon Compton Telescope with High Energy Resolution and Time-of-Flight

Details A Compact Liquid Xenon Compton Telescope with High Energy Resolution and Time-of-Flight A Compact Liquid Xenon Compton Telescope with High Energy Resolution and Time-of-Flight

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.1814o&link_type=abstract

American Astronomical Society, HEAD meeting #9, #18.14; Bulletin of the American Astronomical Society, Vol. 38, p.383

Astronomy and Astrophysics

Astronomy

Scientific paper

Two recent developments have led us to propose a new type of Compton telescope
in compact geometry with time-of-flight, for gamma-ray astronomy in the energy
regime of 0.2 - 10 MeV. First, the technology of vacuum ultraviolet photosensors
for efficient and fast readout of liquid xenon (LXe) scintillation light has
improved dramatically over the last few years, and new developments are
underway. A LXe Advanced Compton Telescope would consist of two detector arrays
of LXe time projection chambers in compact geometry, with time-of-flight (ToF)
between detector modules at a resolution of order 100 ps. Second, the previously
achieved moderate energy resolution in LXe, a significant draw-back for
gamma-ray line spectroscopy, has been found to be largely due to a strong
anti-correlation of ionization and scintillation in LXe. Efficient measurement
of both charge and light enables us to improve energy resolution greatly. A
factor of three improvement over a previous prototype, LXeGRIT, has already been
achieved, and the measured underlying physics indicate the possibility of
achievng energy resolution below 1% FWHM at 1 MeV. We are vigorously working on
improving light and charge readout to realize this potential in a practical
detector. We report on the status and prospects of our current research and
development program.
This work is supported by NASA grant NNG05WC24G.

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