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29 January 2004 CLAIRE gamma-ray lens: flight and long-distance test results
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CLAIRE is a balloon-borne experiment dedicated to validating the concept of a diffraction gamma-ray lens. This new concept for high energy telescopes is very promising and could significantly increase sensitivity and angular resolution in nuclear astrophysics. CLAIRE's lens consists of 556 Ge-Si crystals, focusing 170 keV gamma-ray photons onto a 3x3 matrix of HPGe detectors, each detector element being only 1.4x1.4x4 cm3. On June 14 2001, CLAIRE was launched by the French Space Agency (CNES)from its balloon base at Gap in the French Alps and was recovered near the Atlantic ocean (500 km to the west) after about 5 hours at float altitude. Pointing accuracy and gondola stabilization allowed us to select 1h12' of "good time intervals" for the data analysis. During this time, 33 diffracted photons have been detected leading to a 3σ detection of the source. Additional measurements made on a ground based 205 meters long test range are also presented. The results of this latter experiment confirm those of the stratospheric flight.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Hubert Halloin, Peter von Ballmoos, Jean Evrard, Gerald K. Skinner, Margarida Hernanz, Nikolai V. Abrosimov, Pierre Bastie, Bernard Hamelin, V. Lonjou, Jose Manuel Alvarez, A. Laurens, Pierre Jean, Juergen Knoedleseder, Robert K. Smither, and Gilbert Vedrenne "CLAIRE gamma-ray lens: flight and long-distance test results", Proc. SPIE 5168, Optics for EUV, X-Ray, and Gamma-Ray Astronomy, (29 January 2004);


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