BEXCO - Room A(101/102)
[CRD109] Gamma ray and antiparticles fluxes as tools to study the propagation of cosmic rays in the Galaxy
The spectra of cosmic rays observed at the Earth are determined by the properties of their sources and by the properties of their propagation in the Galaxy. Disentangling the source and propagation effects is a problem of central importance for cosmic ray astrophysics. To solve this problem, the study of the fluxes of antiparticles (positrons and antiprotons), and a comparison of these fluxes with each other and with the diffuse Galactic flux of gamma rays, can be a very powerful tool. It is in fact expected that the dominant mechanism of production is identical for all three (positrons, antiprotons and gamma rays) particle types, namely the creation of the particles as secondary products in the interactions of primary cosmic rays. The relative size of the source spectra for the three particles is therefore reasonably well known, as it is determined by the known properties of hadronic interactions. Very important information about the propagation of different particles in the Galaxy can then be obtained comparing the source spectra with the observed fluxes. This paper discusses the conclusion that can be obtained following this line of investigation, and compare these conclusions with the results obtained from the study of secondary nuclei (such al lithium, beryllium and boron).