Saturation effects in the AMS-1 tracker dE/dx data

Details Saturation effects in the AMS-1 tracker dE/dx data Saturation effects in the AMS-1 tracker dE/dx data

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..566..365c&link_type=abstract

OBSERVING ULTRAHIGH ENERGY COSMIC RAYS FROM SPACE AND EARTH: International Workshop. AIP Conference Proceedings, Volume 566, pp

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Neutrino, Muon, Pion, And Other Elementary Particle Detectors, Cosmic Ray Detectors

Scientific paper

The Alpha Magnetic Spectroscoper (AMS) is a particle detector to be installed in the International Space Station to search for, among other, cosmic anti-nuclei. This instruments includes a silicon tracker immersed in the magnetic field for charge and sign assignment. The exponentially decreasing abundance of cosmic nuclei as function of atomic number (Z) requires accurate predictive power if dE/dx measurements are to be used in Z identification. We analyzed dE/dx from AMS prototype (AMS-1) flight test carried out on the NASA's Discovery Shuttle in 1998. The data show appreciable deviations from the Z2 dependence predicted by Bethe-Bloch equation. An interpretation of this phenomenon, based on our Energy Deposition by Secondary Electrons (EDSE) model, is proposed which reproduces the general features of the data. .

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