A consideration of the neutron capture time scale in the s-process

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Neutron Flux Density, Nuclear Capture, Nuclear Fusion, Time Dependence, Abundance, Astrophysics, Decay Rates, Rare Earth Elements, Solar System, Stellar Evolution

Scientific paper

The question of the mean neutron-capture interval in s-process nucleosynthesis is considered based upon s-process branching at Tl-204 and Sm-151. It is concluded that the mean neutron flux during s-process nucleosynthesis was of the order of 1-10 quadrillion n per sec per cu cm with a typical time scale between s-process neutron captures of the order of a few tens of years for nuclei with cross sections of about 100 mb. The new experimental data (cross section and abundances) pertaining to Pb which were used in the present s-process neutron-flux analysis can have a significant effect on Pb-205 nucleochronology; the 2.3-keV excited state of Pb-205 also may be important. The Pb-205 chronology is discussed briefly in an appendix.

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