Aula Conversi (Dip. di Fisica - Edificio G. Marconi)
Aula Conversi
Dip. di Fisica - Edificio G. Marconi
Description
With two Antarctic flights from McMurdo, the balloon experiment CREAM (Cosmic Ray Energetics And Mass) collected
data for about 70 days, measuring the charge and the energy of cosmic rays (CR) with a redundant system of particle
identification and an imaging ionization calorimeter. Preliminary direct measurements of the absolute fluxes
of individual CR nuclei in the elemental range from carbon to iron at very high energy and of the secondary-to-primary ratios B/C and N/O are reported.
The Boron-to-Carbon ratio (B/C) data agree with previous measurements at lower energies and show a
relatively steep decline ( E−0.6 to E−0.5) at higher energies, up to about 1 TeV/n.
