Transfer Reactions as Neutron Sources for the S-Process
Abstract
The three-nucleon transfer reactions (alpha, n) are possible neutron sources for the s-process. The energy dependence of the S-factor on the direct and the nonresonant compound nucleus reaction mechanisms was investigated. As an example the ground state transition of the reaction Ne-22(alpha, n) Mg-25 was studied. The differential cross section for the direct part shows a strong backward enhancement. The direct contribution to the S-factor is strongly enhanced compared to the nonresonant part of the compound nucleus contribution when extrapolating to lower energies.
- Publication:
-
From Miras to Planetary Nebulae: Which Path for Stellar Evolution?
- Pub Date:
- 1990
- Bibcode:
- 1990fmpn.coll..326B
- Keywords:
-
- Asymptotic Giant Branch Stars;
- Neutron Sources;
- Nuclear Reactions;
- Stellar Evolution;
- Heavy Elements;
- Magnesium Isotopes;
- Neon Isotopes;
- Astrophysics