292 research outputs found
AMS, a particle spectrometer in space
The results of the AMS01 experiment are reviewed. The proton flux measured
below the geomagnetic cutoff is interpreted. Some Physics prospects for AMS02
on the International Space Station are outlined.Comment: Talk given at the XXIV Symposium on Nuclear Physics, Taxco, Mexico,
January 3-6, 2001. To appear in Rev. Mex. de Fisic
Parameterization of the antiproton inclusive production cross section on nuclei
A new parameterization of the antiproton inclusive production cross section
in proton-proton and proton-nucleus collisions is proposed. A sample of
consistent pA->pbar X$ experimental data sets measured on 1<A<208 nuclei, from
12 GeV up to 400 GeV incident energy, have been used to constrain the
parameters. A broader energy domain is covered for the pp->pbar X reaction with
a simplified functional form used in the fits. The agreement obtained with the
data is good. The results are discussed.Comment: 10 pages, 11 figures, 7 tables, submitted to Phys. Rev.
Atmospheric neutrino flux around Super-Kamiokande
The simulated atmospheric neutrino flux around Super-Kamiokande detector is tabulated in this report. The corresponding fitting is also given
Secondary antiproton flux induced by cosmic ray interactions with the atmosphere
The atmospheric secondary antiproton flux is studied for detection altitudes
extending from sea level up to about 3 earth radii, by means of a 3-dimensional
Monte-Carlo simulation, successfully applied previously on other satellite and
balloon data. The calculated antiproton flux at mountain altitude is found in
fair agreement with the recent BESS measurements. The flux at balloon altitude
is also in agreement with calculations performed in previous studies and used
for the analysis of balloon data. The flux at sea level is found to be
significant. The antineutron flux is also evaluated. The antiproton flux is
prospectively explored at large distance from earth up to around 2 10 km.
The results are discussed in the context of the forthcoming measurements by
large acceptance experiments.Comment: 12 pages, 9 figures, 1 table, submitted to Phys. Rev.
A RICH prototype for the AMS experiment
The AMS spectrometer will be installed on the International Space Station at
the end of 2003. Among other improvements over the first version of the
instrument, a ring imaging Cherenkov detector (RICH) will be added which latter
should open a new window for cosmic-ray physics, allowing isotope separation up
to A~25 between 1 and 10 GeV/c and elements identification up to Z~25 between
threshold and 1 TeV/c/nucleon. It should also contribute to the high level of
redundancy required for AMS and reject efficiency albedo particles. The results
of the first generation prototype and the expected results of the new one are
discussed.Comment: 4 pages, 6 figures, ICRC proceeding
Cerenkov angle and charge reconstruction with the RICH detector of the AMS experiment
The Alpha Magnetic Spectrometer (AMS) experiment to be installed on the
International Space Station (ISS) will be equipped with a proximity focusing
Ring Imaging Cerenkov (RICH) detector, for measurements of particle electric
charge and velocity. In this note, two possible methods for reconstructing the
Cerenkov angle and the electric charge with the RICH, are discussed. A
Likelihood method for the Cerenkov angle reconstruction was applied leading to
a velocity determination for protons with a resolution of around 0.1%. The
existence of a large fraction of background photons which can vary from event
to event, implied a charge reconstruction method based on an overall efficiency
estimation on an event-by-event basis.Comment: Proceedings submitted to RICH 2002 (Pylos-Greece
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