Propagation of the cosmic-ray iron group at intermediate energies |
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Authors: | C Baixeras M Casas F Fernandez A Vidal-Quadras M Ortega |
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Institution: | (1) Laboratorio de Física Corpuscular, Departamento de Física Fundamental, Universidad Autónoma de Barcelona, Bellaterra, Barcelona, Spain |
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Abstract: | Elemental abundances of the VH group of cosmic radiation have been measured in the energy interval 250–550 MeV nucl–1 in a balloon exposure at Sioux Falls (South Dakota) of a plastic detector LeXAN stack. The so obtained abundances have been extrapolated to the sources in the frame of the homogeneous model correcting for energy loss. After taking into account solar modulation, the best fit to model values has led to a escape mean free path e = 5E
–0.4 g cm–2, whereE is the energy in GeV nucl–1, forE>1 GeV nucl–1, and a constant e = 5 g cm–2 forE 1 GeV nucl–1. When turning to the diffusion model, also including an energy loss term, a diffusion coefficientD=3×1028 cm2 s–1 has been estimated. |
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