AMS-01: First flight, first results; future AMS-02

Becker, Ulrich
June 2000
AIP Conference Proceedings;2000, Vol. 516 Issue 1, p335
Academic Journal
The Alpha Magnetic Spectrometer (AMS) was constructed 1995–1997 as a particle spectrometer in space. During the shuttle flight SPS91 June 2–12, 1998 it received 100 h of data in space. No antihelium was found among 2.8 million He nuclei and no antimatter in 156,000 Z>2 nuclei. Protons were measured with very high accuracy, including detailed second spectra below the cutoff. Fits to the spectra above 10 GeV are given. Surprisingly, at the magnetic equator, positrons are four times more copious than electrons. He nuclei below the cutoff are dominantly He[sup 3]. A short description of the complete detector for the 3 years on the space station ISS is presented. © 2000 American Institute of Physics.


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