Physics
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989nimpa.283..596c&link_type=abstract
Nuclear Instruments and Methods in Physics Research Section A, Volume 283, Issue 3, p. 596-601.
Physics
1
Scientific paper
We describe experimental results obtained using a new type of detector for high-energy gamma astrophysics. The detector will measure gamma rays in the GeV range, with an angular resolution of a few mrad and a field of view of 50°. The telescope is based on the imaging of the Cherenkov light produced in a dense medium (liquid or solid) limited by a parabolic or spherical reflecting surface. The high-energy electrons produced at the start of the electromagnetic shower retain enough information about their initial direction to generate a ring-shaped photon image. This may produce hundreds or thousands of photoelectrons on an appropriate photon-imaging detector placed at the focal plane of the system, which is at the entrance surface of the converter. A prototype consisting of a liquid radiator (C6F14), a multistep parallel-plate avalanche chamber and an optical readout system was tested in a 9 GeV/c charged-particle beam. Preliminary results show that an angular resolution of a few mrad can be obtained. Furthermore, the capability of such a detector to identify e/π in the GeV range seems promising.
Charpak Georges
Dominik Wojciech
Giomataris Y.
Gougas A.
Sauli Francesca
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