November 11, 2009

"Recent Results from Cosmic Ray Experiments"

Dr. Eun-Suk Seo
University of of Maryland


Balloon-borne and space based instruments configured with particle detectors have been flown to study cosmic-ray origin, acceleration and propagation. They were also used to search for exotic sources, such as dark matter and antimatter, and to explore a possible limit to particle acceleration in supernova. I will review recent results from cosmic-ray experiments, including the unexpected excess in electrons (and positrons) reported by the Advanced Thin Ionization Calorimeter (ATIC) and Payload for Antimatter Matter Exploration and Light-nuclei Astrophysics (PAMELA), along with their implications. The observed excess of leptons is attributed either to a relatively nearby, unidentified astrophysical object that accelerates electrons to those energies or to annihilation of dark matter. I will also discuss some highlights of results from our on-going Cosmic Ray Energetics And Mass (CREAM) experiment that constrain the conventional cosmic ray propagation model.


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