Alpha Magnetic Spectrometer

The Alpha Magnetic Spectrometer (AMS-02) is a state-of-the-art particle physics detector designed to operate as an external module on the International Space Station. It uses the unique environment of space to study the universe and its origin by searching for nuclear antimatter or dark matter annihilation signals while performing precision measurements of cosmic rays composition and flux. The AMS-02 observations will help answer fundamental questions, such as "What makes up the universe's invisible mass?" or "What happened to the primordial antimatter?"

With a total weight of 7.5 Tons, AMS-02 is the largest magnetic spectrometer ever deployed in space. Brought to space by the last mission of the Shuttle Endeavour, AMS-02 is continuously operating since May 19, 2011 on the upper Payload Attach Point (S3) of the ISS main truss with a collection rate of circa 16 billion cosmic ray particles per year.

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AMS-02 at SSDC

Italy with the National Institute of Nuclear Physics (INFN) and ASI plays an important role in the collaboration. The CNAF computing center of INFN and the SSDC center of ASI contribute with their resources to the analysis effort. A full copy of the AMS-02 data set is stored and available to the Collaboration at CNAF, reduced data set are preserved at SSDC, where resident scientists contribute to the calibration of the detector and to the data analysis.

SSDC is among the scientific institutes authoring the first AMS-02 publications.

AMS-02 published data are available on the SSDC Cosmic Ray Database.

Latest AMS-02 results:


AMS fig 1
A high energy electron reconstructed in AMS-02
Helium Flux
Helium Flux measured by AMS-02, PRL 115 (2015) 211101

Proton Flux
Proton Flux measured by AMS-02, PRL 114 (2015) 171103

Electron and Positron Flux
Electron and Positron Flux measured by AMS-02, PRL 113 (2014) 121102

Electron and Positron sum Flux
Electron and Positron sum Flux measured by AMS-02,
PRL 113 (2014) 221102

Positron fraction
Positron fraction measured by AMS-02, PRL 113 (2014) 121101