Determination of the Galaxy age by the method of uranium–thorium–plutonium isotopic ratios


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Аннотация

The dependence of the Galaxy age (ТG), as determined by the method of uranium–thorium isotopic ratios, on the parameters of the nucleosynthesis model is studied within the theory of galactic nucleosynthesis. It is shown that ТG depends strongly both on the scenario of the production of nuclei in the r-process and those features of neutron-rich nuclei that are used in the respective analysis and on galactic-nucleosynthesis parameters. The effect of a sudden nucleosynthesis spike before the formation of a solar system on the Galaxy age is evaluated. The region of admissible values of the parameters of galacticnucleosynthesis theory is discussed. The method of uranium–thorium isotopic ratios is supplemented with the 244Pu/238U ratio for yet another cosmochronometer pair, and the Galaxy age is estimated on the basis of the model modified in this way.

Авторлар туралы

I. Panov

Institute for Theoretical and Experimental Physics; National Research Center Kurchatov Institute

Хат алмасуға жауапты Автор.
Email: Igor.Panov@itep.ru
Ресей, Bol’shaya Cheremuskinskaya ul. 25, Moscow, 117218; pl.Akademika Kurchatova 1, Moscow, 123182

Yu. Lutostansky

National Research Center Kurchatov Institute

Email: Igor.Panov@itep.ru
Ресей, pl.Akademika Kurchatova 1, Moscow, 123182

M. Eichler

Institut für Kernphysik

Email: Igor.Panov@itep.ru
Германия, S2|15, Schloßgartenstraße 7, Darmstadt, 64289

F.-K. Thielemann

Institut für Physik

Email: Igor.Panov@itep.ru
Швейцария, Klingelbergstrasse 82, Basel, 4056

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