Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...197..615b&link_type=abstract
Astrophysical Journal, vol. 197, May 1, 1975, pt. 1, p. 615-620. Research supported by the Aerospace Corp.
Astronomy and Astrophysics
Astrophysics
23
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.
Bernard Blake J.
Schramm David N.
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