12-20 July 2017
Asia/Seoul timezone
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BEXCO - Room A(101/102)

[CRD079] Precision Measurement of the positron fraction in Primary Cosmic Rays with AMS on the International Space Station


  • Zuhao LI

Primary authors

  • Zuhao LI (Institute of High Energy Physics,Chinese Academy of Sciences, China)


The latest AMS results on the precision measurement of the positron fraction in primary cosmic rays in the energy range from 0.5 to 700 GeV based on ~20 million positron and electron events will be presented. This measurement extends the energy range of our previous observation and increases its precision. The new results show that at ∼260 GeV the positron fraction reaches its maximum. Comparison of the measured positron fraction with the Dark Matter and other models will be presented.