Reaction rates of the s-process neutron sources Ne-22(alpha, n)Mg-25 and C-13(alpha, n)O-16

Details Reaction rates of the s-process neutron sources Ne-22(alpha, n)Mg-25 and C-13(alpha, n)O-16 Reaction rates of the s-process neutron sources Ne-22(alpha, n)Mg-25 and C-13(alpha, n)O-16

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...414..735d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 414, no. 2, p. 735-739.

Astronomy and Astrophysics

Astrophysics

41

Nuclear Astrophysics, Nuclear Fusion, Peculiar Stars, Reaction Kinetics, Stellar Interiors, Abundance, Giant Stars, Neutron Emission, Stellar Evolution

Scientific paper

The excitation function of the s-process neutron source reactions Ne-22N(alpha, n)Mg-25 and C-13(alpha, n)O-16 has been measured using improved ion-beam, target, and detection techniques, reaching a sensitivity limit of 50 picobarns in the best cases. For Ne-22Ne(alpha, n)Mg-25 the new data cover the energy range from threshold up to 2300 keV. From these experiments some of the parameters of the Ne-22(alpha, n)Mg-25 resonances have been determined using unfolding techniques. A resonance at about 620 keV could clearly be ascribed to the background reaction B-11(alpha, n)N-l4. The excitation function of C-13(alpha, n)O-16 has been measured over the energy range 350-1400 keV, where the cross section varies over eight orders of magnitude. The S-factor of this reaction indicates an increase toward lower energies. On the basis of the experimental data the reaction rates at helium-burning temperatures were determined for these two reactions: both rates are increased compared with previous evaluations.

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