Abstract
Precision measurements by AMS of the fluxes of cosmic ray positrons, electrons, antiprotons, protons as well as their rations reveal several unexpected and intriguing features. The presented measurements extend the energy range of the previous observations with much increased precision. The new results show that the behavior of positron flux at around 300 GeV is consistent with a new source that produce equal amount of high energy electrons and positrons. In addition, in the absolute rigidity range 60–500 GV, the antiproton, proton, and positron fluxes are found to have nearly identical rigidity dependence and the electron flux exhibits different rigidity dependence.
Highlights
AMS-02 [1–14] is a state-of-the-art particle physics detector designed to operate as an external module on the International Space Station (ISS)
While some of cosmic ray pand e+ are produced by interactions of the cosmic ray nuclei with the interstellar gas, there could be a substantial contribution from annihilation of dark matter particles, acceleration/production by astrophysical objects, or evaporation of primordial black holes
In six years on the ISS, AMS has recorded more than 100 billion cosmic ray events
Summary
AMS-02 [1–14] is a state-of-the-art particle physics detector designed to operate as an external module on the International Space Station (ISS). It is studying the universe and its origin by searching for antimatter and dark matter, while performing precision measurements of Cosmic Ray (CR) composition and flux. Experimental data on the cosmic ray antiprotons, p , and positrons, e+, are crucial for understanding the origin of antimatter in cosmos, providing an insight into new physics phenomena. The sensitivity of cosmic ray positrons to these new phenomena is complementary to the sensitivity of the measurements of antiprotons, whose production by nearby pulsars is expected to be negligible. AMS has precisely measured the fluxes of all the elementary particles in the cosmos, this allows for new observations of their properties
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