Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....4.1861z&link_type=abstract
Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I
Physics
Scientific paper
albedo, radiation backscattered from an interaction and from the subsequent shower development, provides a `background' for calorimeter experiments. In ATIC (Advanced Thin Ionization Calorimeter), a balloon borne instrument to measure cosmic ray composition and energy spectra for elements from hydrogen to iron from 30 GeV to near 100 TeV, a fully active BGO calorimeter follows a carbon interaction target and scintillator ho doscopes. The first detector is a silicon matrix constructed of 4480 individual silicon pixels, each 2 cm × 1.5 cm, that provide a measurement of the charge of the primary particle in the presence of albedo. ATIC had two successful balloon flights in Antarctica: from 28 Dec 2000 to 13 Jan 2001 (ATIC-1) and from 29 Dec 2002 to 18 Jan 2003 (ATIC-2). We compare the albedo signals measured in the silicon matrix during the ATIC-1 flight with simulations performed using the GEANT 3.21 code and the QGSM event generator for nucleus-nucleus interactions.
Adams James H. Jr.
Ahn H. S.
Bashindzhagyan G. L.
Batkov K. E.
Chang Jaewan
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