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)

Monday, 8 April 2013 from to (Europe/Rome)
at INFN ( 131 )
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.