S-process studies in the light of new experimental cross sections - Distribution of neutron fluences and r-process residuals
Abstract
A best set of neutron-capture cross sections has been evaluated for the most important s-process isotopes. With this data base, s-process studies have been carried out using the traditional model which assumes a steady neutron flux and an exponential distribution of neutron irradiations. The calculated sigma-N curve is in excellent agreement with the empirical sigma-N-values of pure s-process nuclei. Simultaneously, good agreement is found between the difference of solar and s-process abundances and the abundances of pure r-process nuclei. The abundance pattern of the iron group elements where s-process results complement the abundances obtained from explosive nuclear burning is discussed. The results obtained from the traditional s-process model such as seed abundances, mean neutron irradiations, or neutron densities are compared to recent stellar model calculations which assume the He-burning shells of red giant stars as the site for the s-process.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- June 1982
- DOI:
- 10.1086/160033
- Bibcode:
- 1982ApJ...257..821K
- Keywords:
-
- Absorption Cross Sections;
- Neutron Cross Sections;
- Neutron Irradiation;
- Nuclear Fusion;
- Nuclei (Nuclear Physics);
- Red Giant Stars;
- Abundance;
- Branching (Physics);
- Fluence;
- Flux (Rate);
- Isotopes;
- Maxwell-Boltzmann Density Function;
- Stellar Envelopes;
- Stellar Models;
- Nuclear and High-Energy Physics