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.