Seminars and Colloquia

Precision measurement of the positron fraction in primary cosmic rays in the energy interval 0.5-350 GeV with the AMS-02 detector on the International Space Station

by Marco Incagli (PI)

Europe/Rome
131 (INFN)

131

INFN

Description
Alpha Magnetic Spectrometer (AMS-02) is a general purpose high energy particle detector which was successfully deployed on the International Space Station (ISS) on May 19, 2011 to conduct a unique long duration mission of fundamental physics research in space. The results of the AMS experiment on the primary positron fraction in the energy range from 0.5 to 350 GeV are presented. Events have been collected in the first 18 months of data taking, for a total statistics of ~6 million electrons and ~600,000 positrons. The data show that the positron fraction is steadily increasing from 10 to ~250 GeV. The positron fraction spectrum shows no structure and the positron to electron ratio shows no observable anisotropy.
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