Measurement of the (16)O(n, gamma)(17)O reaction cross section at stellar energy and the critical role of nonresonant p-wave neutron capture

Details Measurement of the (16)O(n, gamma)(17)O reaction cross section at stellar energy and the critical role of nonresonant p-wave neutron capture Measurement of the (16)O(n, gamma)(17)O reaction cross section at stellar energy and the critical role of nonresonant p-wave neutron capture

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...441l..89i&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 441, no. 2, p. L89-L92

Astronomy and Astrophysics

Astrophysics

40

Abundance, Big Bang Cosmology, Metallic Stars, Nuclear Reactions, Stellar Models, Gamma Rays, Isotopes, Neutron Flux Density, Reaction Kinetics

Scientific paper

The cross section of the (16)O(n, gamma)(17)O reaction, important for nucleosynthesis theories of s and p processes and of inhomogeneous big bang models, has been measured at stellar neutron energy. The Maxwellian-averaged cross section at kT = 30 keV was derived as 34 +/- 4 microbarn; 170 times larger than the value reported previously. The results could significantly alter the s and p process efficiencies in metal-deficient stars due to a strong neutron poison of O-16 and increase the primordial nucleosynthesis yield in inhomogeneous models. The large cross section is attributed to a nonresonant p-wave neutron-capture process. It is pointed out that this process plays an important role in the neutron-capture reaction of light nuclei at stellar energy; the cross section deviates considerably from the extrapolated value of the measured thermal-capture cross section by assuming a 1/v law and therefore the process significantly influences both the stellar and above-mentioned primordial nucleosynthesis theories.

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