Measurement of the Se-76(n-gamma) capture cross section and phenomenological s-process studies - The weak component

Details Measurement of the Se-76(n-gamma) capture cross section and phenomenological s-process studies - The weak component Measurement of the Se-76(n-gamma) capture cross section and phenomenological s-process studies - The weak component

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...389..784b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 389, April 20, 1992, p. 784-790.

Astronomy and Astrophysics

Astrophysics

15

Abundance, Neutron Scattering, Nuclear Fusion, Selenium Isotopes, Van De Graaff Accelerators, Massive Stars, Maxwell Equation, Stellar Composition, Thermal Energy, Time Of Flight Spectrometers

Scientific paper

The excitation function of the reaction Se-76(n, gamma) has been measured in the energy range from 3 to 200 keV neutron energy. The Maxwellian-averaged capture cross section versus thermal energy kT has been calculated. For kT = 30 keV a value of 164 +/- 8 mbarn has been derived. The weak component s-process in the mass range A = 56 to 90 has been studied. Two models for the weak component, an s-process with an exponential exposure distribution and an s-process with a distinct single exposure, have been discussed. For a consistent description of the abundances of the weak component s-process under realistic stellar conditions a considerable part of the material produced during core He-burning in massive stars must be reprocessed by subsequent C-burning. The solar Kr-abundance was determined to be (47 +/- 5) 10 exp 6 Si.

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