A positron annihilation radiation telescope using Laue diffraction in a crystal lens

Details A positron annihilation radiation telescope using Laue diffraction in a crystal lens A positron annihilation radiation telescope using Laue diffraction in a crystal lens

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apjs...92..663v&link_type=abstract

The Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 92, no. 2, p. 663-669

Astronomy and Astrophysics

Astronomy

10

Gamma Ray Telescopes, Laue Method, Lenses, Positron Annihilation, Angular Resolution, Balloon-Borne Instruments, Diffraction, Focal Plane Devices, Gamma Ray Astronomy, Sensitivity, Spatial Resolution

Scientific paper

We present a new type of gamma-ray telescope featuring a Laue diffraction lens, a detector module with a 3 x 3 germanium array, and a balloon gondola stabilized to 5 sec pointing accuracy. The instrument's lens is designed to collect 511 keV photons on its 150 sq cm effective area and focus them onto a small detector having only approximately 14 cm3 of equivalent volume for background noise. As a result, this telescope overcomes the mass-sensitivity impasse of present detectors where the collection area is identical to the detection area. The sensitivity of our instrument is anticipated to be 3 x 10-5 photons cm-2 s-1 at 511 keV with an angular resolution of 15 sec and an energy resolution of 2 keV. These features will allow us to resolve a possible narrow 511 keV both energetically and spatially within a Galactic center 'microquasar' such as 1E 1740.7-2942 or GRS 1758-258. Besides the Galactic 'microquasars', other prime objectives include Cygnus X-1, X-ray binaries, and pulsars.

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