The effect of the Galactic gas distribution on the expected cosmic rays spectrum

We will analyze the importance of varying the diffuse gas radial distribution on the resulting expected cosmic rays spectrum. We use the recent HI density data published by Nakanishi et al. (2004), and include them in the cosmic rays propagation code GALPROP (Strong & Moskalenko 1998). We will obtain those models that reproduce the characteristics shown by the cosmic rays data, and we will then extract information about the Galaxy structure.