The TIGRE desktop prototype results for 511 and 900 keV gamma rays

摘要: A small desktop prototype of the Tracking and Imaging Gamma-Ray Experiment (TIGRE) has been assembled tested at 511 keV 900 keV. TIGRE was designed to observe cosmic gamma ray sources energies 0.3 100 MeV. Its major feature is its use multi-layer silicon strip detectors track Compton recoil electrons positron-electron pairs. Our consists 7 double sided 3.2 cm/spl times/3.2 times/300 micron with 1 mm pitch in both x y directions. The direction energy scattered measured CsI(Tl) photodiode detectors. Knowing momentum electron photon allows us determine incident uniquely. In 36 crystals times/1 times/1.7 cm were used. Non-tracked events, those interacting only a single plane, can be determined within scatter ring. strips calibrated using 60 photons from Am/sup 241/ Landau peak obtained Sr/sup 90/ beta source. resolution 8 (1/spl sigma/) 7.8% FWHM for CsI Total resolutions 11% 8.9% respectively. An important requirement will ability separate upward moving rays produced by interactions atmosphere downward rays. For tracked events this done defining motion (DOM) parameter deposition multiple scattering layers. Measurements show that DOM correctly predicted 70% 75% which constitute 9% 20% data. Monte Carlo simulations similar results percentage increasing 98% 6 MeV nearly all are tracked. >