Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....1..319c&link_type=abstract
Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I
Physics
1
Scientific paper
The residence time of the galactic cosmic rays in the disk is known from radioactive clo cks at energies below 1 GeV and amounts to several million years. It is still unmeasured at very high energy. In this presentation is reported a calculation of the residence time of galactic cosmic rays in the energy range 109 -1019 eV. The method of calculation uses hundreds millions of cosmic ray trajectories generated in the disk by appropriate algorithms. The magnetic field configuration and gas density which dominate the computed residence time at very high energy are the same adopted for the evaluation of residence time below 1 GeV where a comparison with experimental data is feasible. The computed residence time versus energy has a complex pattern with a maximum value at very low energy, a plateau between 1010 and and 1014 eV and a smo oth decrease at higher energies. A final, second plateau is reached at 1018 eV.
Codino Antonio
Plouin Francois
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