[CvGmt News] avviso Colloquio della Classe di Scienze prof. Pasquale Blasi (20.03.2013)
valeria.giuliani at sns.it
valeria.giuliani at sns.it
Tue Mar 12 10:09:10 CET 2013
Colloqui Classe di Scienze
Mercoledì 20 marzo 2013
ore 15.00
_Scuola Normale Superiore_
Pisa
(Sala Azzurra)
*__*
*Pasquale Blasi__*
/Osservatorio Astrofisico di Arcetri/
//
Terrà un seminario dal titolo:
*/"/**Cosmic Rays one Century from Discovery/"/*
*/Abstract:/**//*
/The penetrating radiation discovered by Viktor Hess one century ago
plays a crucial role for many phenomena of both astrophysical and
terrestrial origin. This radiation ionizes the central parts of
molecular clouds thereby allowing the formation of stars in those
clouds. The death of massive stars in turn leads to the injection of new
cosmic rays in the Galaxy. Cosmic rays are also the main source of DNA
mutations and are believed to have played a very important role in the
evolution of Life on Earth. A few decades after the discovery of the
cosmic origin of the penetrating radiation, cosmic rays literally
bootstrapped the field of particle physics: the positron, the muon, the
pion, several hyperons were first discovered in cosmic rays. Given this
overwhelming role and given the extreme energies that cosmic ray
particles carry (up to a few 10^11 GeV), the search for their sources,
the understanding of the acceleration mechanisms that energize them and
the investigation of their propagation throughout the universe appear to
be of the utmost importance. /
/Here I will summarize the most important steps in the history of cosmic
ray research and the most recent developments in the field. I will
discuss the physics underlying the acceleration of charged particles in
supernova remnants and new avenues to test these ideas, using the
crucial fact that cosmic rays modify the environment in which they get
accelerated. This interaction leads to amplification of magnetic fields
in the acceleration region, which is observed in X-rays, and is crucial
if to aim at understanding acceleration to very high energies. A similar
phenomenon is also likely to occur during propagation of cosmic rays
throughout the Galaxy and might provide an explanation of some puzzling
recent data concerning the spectra of the most abundant chemical species
in cosmic rays. /
/Finally I will try to outline what the next hundred years of cosmic ray
research might look like.
/
Tutti gli interessati sono invitati a partecipare.
Classe di Scienze
--
--------------------------------------------------------------------------------
Valeria Giuliani
Scuola Normale Superiore
Servizio Supporto Attività Didattiche - Scienze
Tel. 050-509260
Fax. 050-509045
Piazza dei Cavalieri, 7
56126 Pisa
E-Mail: v.giuliani at sns.it
E-Mail: segreteria.scienze at sns.it
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Grazie.
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