Status and Recent Results from the Cream Experiment
Cosmic Rays for Particle and Astroparticle Physics(2011)
摘要
The Cosmic Ray Energetics And Mass (CREAM) balloon-borne experiment has accumulated similar to 156 days of exposure during five successful flights over Antarctica. Energy measurements are made with a transition radiation detector and an ionization calorimeter. Charge measurements are made with timing scintillators, pixelated Si, and Cherenkov detectors to minimize the effect of backscattered particles. High energy cosmic-ray data were collected over a wide energy range from similar to 10(10) to similar to 10(15) eV at an average altitude of similar to 38.5 km, with similar to 3.9 g/cm(2) atmospheric overburden. All cosmic-ray elements from protons (Z = 1) to iron nuclei (Z = 26) are separated with excellent charge resolution. The instrument performance, results from the ongoing data analysis, and their implications on cosmic-ray origin, acceleration and propagation are discussed.
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