Nucleosynthetic view of supernovae origin of the galactic cosmic rays

We show that the galactic cosmic ray source (GCRS) composition is described within a factor of similar to 1.6 as a mixture of fresh ejects of Type Ia (SNIa) and Type II (SNII) supernovae, the interstellar matter (ISM) which i s swept up by the ejecta, and Wolf-Rayet stellar wind material (WR). The be st mixing ratios of the four source materials are determined on the basis o f the recent nucleosynthetic models of supernovae. The frequency of occurre nce of SNIa relative to SNII and the acceleration time of the GCRs after th e SNe explosion are estimated with the best mixing ratios to be similar to 0.43 and similar to 10(3) y respectively. The profound implications of our findings are discussed with respect to the acceleration of the GCRs in SN r emnants.