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OATS-DAUT SEMINAR
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Speaker:
Roberto Battiston (INFN, Perugia)
Title:
Cosmic-ray Astrophysics with AMS-02
Date: Wednesday, February 21st, 2007
Time: 12:00 noon
Venue: Villa Bazzoni
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Abstract:
Precise knowledge of the hadronic component of
cosmic rays is needed to describe the cosmic ray production,
acceleration and propagation mechanisms in our galaxy. Present
measurements suffer from limitations coming from short exposure time,
intrinsic instrumental limitations and restricted energy range. The
AMS-02 experiment is a large acceptance magnetic spectrometer to
perform high statistics studies of cosmic rays in space. The detector
will operate on the International Space Station for more than 3
years. AMS-02 will precisely measure the cosmic ray fluxes of
individual elements up to Z~25 in the rigidity range from ~1GV to
~1TV. AMS-02 will allow to test propagation models through the precise
measurements of secondary-to-primary ratios as D/p, 3He/4He in the
energy range few hundreds MeV to tens of GeV, and B/C, sub-Fe/Fe up to
~1TV. In particular the original measurements of 10Be/9Be will be
performed with high accuracy allowing the understanding of the age of
the cosmic-ray confinement and constraint models of the size of the
galactic halo. Among the goal of the precision measurement of Cosmic
Rays flux and composition by AMS-02 is the measurement for rare
components like positrons, and antiprotons, or component never
observed before like antideuterons and antinuclei. These measurements
could allow to understand cosmic misteries like the origin of dark
matter or the existence of nuclear antimatter.
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