1.
Phys Rev Lett
; 113(12): 121101, 2014 Sep 19.
Article
in English
| MEDLINE
| ID: mdl-25279616
ABSTRACT
A precision measurement by AMS of the positron fraction in primary cosmic rays in the energy range from 0.5 to 500 GeV based on 10.9 million positron and electron events is presented. This measurement extends the energy range of our previous observation and increases its precision. The new results show, for the first time, that above â¼200 GeV the positron fraction no longer exhibits an increase with energy.