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THE ELEMENTAL COMPOSITION OF HIGH-ENERGY COSMIC RAYS: MEASUREMENTS WITH TRACER
TRACER ("Transition Radiation Array for Cosmic Energetic Radiation") is a balloon borne instrument that has been developed to directly measure the composition and energy spectra of individual heavy elements up to 10 15 eV particle -1 . TRACER achieves a large geometric factor (5 m 2 sr) through the use …