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Presented By: Department of Physics

Department Colloquium | Study the Cosmic Rays with the AMS Experiment on the International Space Station

Yuan-Hann Chang (Taiwan NCU)

The Alpha Magnetic Spectrometer (AMS) is a particle spectrometer on board of the International Space Station. It measures the charge, energy and momentum of charged cosmic rays with unprecedented precisions from 1GV to a few TV in rigidity. AMS has collected and analyzed more than 100 billion cosmic ray events during 6 years of operation since May 2011. In this talk we report the latest AMS measurements of the cosmic ray spectra of electron, positron, proton, antiproton, and light nuclei, including He, Li, Be, B, and C, O. Unexpected characteristics of the spectra are observed. They provide important new inputs for the study of fundamental physics as well as understanding the mechanism of cosmic ray acceleration and propagation.

Biosketch: Yuan-Hann Chang is a professor in the Physics Department of the National Central University, Chung-Li, Taiwan. He received his PhD from the Massachusetts Institute of Technology. His professional interests are experimental particle physics. In the past 30 years, he participated particle experiments including L3, PHOBOS, and CMS, and astroparticle experiments NCT and AMS. He is currently a member of the AMS collaboration.

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