NUCLEOCOSMOCHRONOLOGY OF THE SOLAR-SYSTEM MATTER

According to different long living radioactive cosmochronometers the a ges of elements synthesied in s- and r-processes are corresponding to 13-20 b.y. Assuming the element synthesis begins at the time of Galaxy star formation, the Galaxy age should be also corresponding to the ab ove range. The most adequate value of element age is considered to be estimated in terms of a model of monostage total Galaxy nucleosynthesi s in the explosion of the Protogalaxy core and is equal to 10.9 b.y. A number of observational facts such as osmium isotopic composition, Th /Nd ratio in stars of different age are indicating the monostage eleme nt synthesis. Arguments on the short living isotopes (Pu-244, I-129, A l-26, Pd-107) existence in the ancient Solar system. According to the data on Pu-244 and I-129 the time interval between the termination of the nucleosynthesis and Solar system formation is estimated as 1.6 . 1 0(8) y. However the observed content of radiogenic Mg-26 and Ag-107* could be consisted with one final nucleosynthesis event at r greater-t han-or-equal-to 1 m.y. whereas the interval between the latter and sma ll planet melting is estimated as 10(7) y. These discrepancies in r-va lues could be explained by two factors: 1) different sites of formatio n of Pu-244 and I-129 within the r-process of inner Supernova shells i n contrast to that of Al-26, Pd-107 provided by H and He buring at out er shells of a massive star followed by removing of reaction products by the intensive solar wind: 2) metamorphic processes leading to the f ormation of mineral phases containing the decay products of named isot opes. The cosmic scale of nucleosynthesis and Universe evolution is pr esented.