Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2009-01-23
Phys.Rev.C77:065802,2008
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
13 pages, 6 figures
Scientific paper
10.1103/PhysRevC.77.065802
The 138La (T1/2=102 Gyr) - 138Ce - 136Ce system is proposed to be used as a nuclear cosmochronometer for measuring the time elapsed from a supernova neutrino process. This chronometer is applied to examine a sample affected by a single nucleosynthesis episode as presolar grains in primitive meteorites. A feature of this chronometer is to evaluate the initial abundance ratio of 136Ce/138Ce using an empirical scaling law, which was found in the solar abundances. We calculate the age of the sample as a function of isotopic ratios, 136Ce/138Ce, and 138La/138Ce, and evaluate the age uncertainty due to theoretical and observational errors. It is concluded that this chronometer can work well for a sample with the abundance ratio of 138La/138Ce >= 20 when the ratios of 136Ce/138Ce and 138La/138Ce are measured within the uncertainty of 20%. The availability of such samples becomes clear in recent studies of the presolar grains. We also discuss the effect of the nuclear structure to the neutrino process origin of 138La.
Hayakawa Takehito
Kajino Toshitaka
Nakada Hitoshi
Ogawa Kengo
Shizuma Toshiyuki
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