New Detremination Method of Primordial Li Abundance

Abstract

We discuss the primordial nucleosynthesis in lepton asymmetric Universe models. In order to better estimate the universal baryon-mass density parameter ${\Omega }_b$, we try to remove the uncertainty from the theoretical prediction of primordial ${}^7$Li abundance. We propose a new method to determine the primordial ${}^7$Li by the use of isotopic abundance ratio ${}^7$Li/${}^6$Li in the interstellar medium which exhibits the minimum effects of the stellar processes.

6 pages including 3 figures, To appear in "The Light Elements and Their Evolution," IAU Symposium 198, ASP Conference Series, eds. L. da Silva, M. Spite, & J.R. de Medeiros (ASP, San Francisco)