SPACE AND COSMIC RAY PHYSICS SEMINAR

University of Maryland
Atlantic Building, Room 2400
4:30 PM Monday, September 29, 2008
Coffee, Tea & Snacks 4:15-4:30 PM

Hoseok Ahn
University of Maryland

Advanced Thin Ionization Calorimeter (ATIC) Long-Duration Balloon Experiment

ATIC is a balloon-borne experiment designed to investigate the composition and energy spectra of cosmic rays of charge Z = 1 to 26 over an energy range from ~100 GeV to ~100 TeV. The instrument consists of a silicon charge detector, plastic scintillator hodoscopes interleaved with graphite interaction targets, and an 18 radiation-length deep, fully-active bismuth germanate (BGO) calorimeter. ATIC has had three successful long-duration balloon (LDB) flights launched from McMurdo station, Antarctica in 2000, 2002, and 2007. In this seminar, the details of the ATIC experiment and its Antarctic campaigns will be described, and various analysis results from the first two flights will be presented.