[CvGmt News] avviso Colloquio della Classe di Scienze prof. Pasquale Blasi (20.03.2013)

[valeria.giuliani at sns.it]

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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