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Measurements of ultra heavy nuclei at GeV/n energies in the galactic cosmicradiation address the question of the sources (nucleosynthetic s- andr-processes). As such, the determination of CR source abundances is a promisingway to discriminate between existing nucleosynthesis models. For primaryspecies (nuclei present and accelerated at sources), it is generally assumedthat the relative propagated abundances, if they are close in mass, are not toodifferent from their relative source abundances. Besides, the range of thecorrection factor associated to propagation has been estimated in weighted slabmodels only. Heavy CRs that are detected near Earth were accelerated fromregions that are closer to us than were the light nuclei. Hence, the geometryof sources in the Solar neighbourhood, and as equally important, the geometryof gas in the same region, must be taken into account. In this paper, a twozone diffusion model is used, and as was previously investigated forradioactive species, we report here on the impact of the local interstellarmedium (LISM) feature (under-dense medium over a scale ~100 pc) on primary andsecondary stable nuclei propagated abundances. Going down to Fe nuclei, theconnection between heavy and light abundances is also inspected. A generaltrend is found that decreases the UHCR source abundances relative to the HCRones. This could have an impact on the level of r-process required to reproducethe data.Comment: 12 pages, 9 figures, accepted by A&A. Comparison with truncated  weighted slab and discussion added. Figure 8 modified. New appendix on  truncated weighted slab techniqu

Spallation-dominated propagation of heavy cosmic rays and the Local Interstellar Medium (LISM)