Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprp11008g&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
The balloon-borne detector system TRACER (Transition Radiation Array for Cosmic Energetic Radiation) was built to measure the energy spectra of cosmic-ray nuclei with individual element resolution from Z=8 to Z=26 up to 10 TeV/n in a 14-day circum-polar flight. TRACER measures the particle charge with plastic scintillators. It uses a proportional tube array to determine the particle energy via the relativistic rise in ionization loss up to Lorentz factors of γ≈1000. For higher Lorentz factors, TRACER obtains the energy from the intensity of transition radiation produced in plastic fiber blankets, which are sandwiched between the proportional tube layers. The instrument had a first 30-hour test flight in the fall of 1999 from Ft. Sumner, NM, leading to an exposure factor of several m^2sr days. We will discuss the performance of the detector and present energy spectra obtained in this flight.
Gahbauer Florian
Hermann German
Hörandel Jörg
Muller Dietrich
Radu Andrei
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