High Statistics Measurement of the Positron Fraction in Primary Cosmic Rays of 0.5–500 GeV with the Alpha Magnetic Spectrometer on the International Space Station - INSPIRE

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High Statistics Measurement of the Positron Fraction in Primary Cosmic Rays of 0.5–500 GeV with the Alpha Magnetic Spectrometer on the International Space Station

AMS

Collaboration

•

L. Accardo
(
- INFN, Perugia
)

Sep 18, 2014

9 pages

Published in:

Phys.Rev.Lett. 113 (2014) 121101

Published: Sep 18, 2014

DOI:

10.1103/PhysRevLett.113.121101

Experiments:

AMS

View in:

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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 ∼200 GeV the positron fraction no longer exhibits an increase with energy.

96.50.sb
95.35.+d
95.85.Ry
98.70.Sa
cosmic radiation: primary
positron: energy spectrum
precision measurement
magnetic spectrometer
statistics
satellite

References(58)

Figures(0)

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