The Stellar Neutron-Capture Rate of 34S: The Origin of 36S Challenged

Details The Stellar Neutron-Capture Rate of 34S: The Origin of 36S Challenged The Stellar Neutron-Capture Rate of 34S: The Origin of 36S Challenged

Jan 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...528..573r&link_type=abstract

The Astrophysical Journal, Volume 528, Issue 1, pp. 573-581.

Astronomy and Astrophysics

Astronomy

12

Methods: Laboratory, Nuclear Reactions, Nucleosynthesis, Abundances, Stars: Late-Type

Scientific paper

The (n, γ) cross section of 34S has been measured by means of the activation technique using a quasi-stellar neutron spectrum corresponding to a thermal energy of kT=25 keV. In spite of the very small cross section of this neutron-magic nucleus and a number of additional experimental complications, the stellar value of <σv>/vT=226+/-10 μb could be reliably determined. Because of this small cross section, 34S acts as a bottleneck for the reaction flow to 36S. Consequently, the suggested interpretation of the 36S abundance as a neutron monitor for the s-process in massive stars must be ruled out. This implies, however, that the origin of 36S remains an open problem.

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