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Scientific paper
Jan 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc..972..298k&link_type=abstract
EXOTIC NUCLEI AND NUCLEAR/PARTICLE ASTROPHYSICS (II): Proceedings of the Carpathian Summer School of Physics 2007. AIP Conferen
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Nucleosynthesis In Novae, Supernovae, And Other Explosive Environments, Nuclear Reaction Models And Methods, Radiative Capture, Nuclear Explosions
Scientific paper
Since the historical papers by Burbidge et al. and Cameron 50 years ago, it is generally accepted that half of the chemical elements above Fe are formed in explosive stellar scenarios by a rapid neutron-capture process (the classical ``r-process''). Already from their essential ideas, it became clear that a correct modelling of this nucleosynthesis process requires both, the knowledge of various nuclear properties very far from stability and a detailed description of the astrophysical environments. However, it took about three decades, until in 1986 the first experimental nuclear-physics data on the neutron-magic r-isotopes 80Zn and 130Cd could be obtained, which act as key ``waiting points'' in the respective A~=80 and 130 peaks of the Solar-System (SS) r-abundances (Nr,solar). Since then, using steadily improved nuclear data, we have optimized our r-process calculations to reproduce the present observables of the isotopic Nr,solar ``residuals'', as well as the more recent elemental abundances in ultra-metal-poor, r-process-enriched halo stars. Concerning the latter observations, we support the basic idea about two different types of r-processes. Based on our many years' experience with the site-independent ``waiting-point approach'', we recently have extended our studies to fully dynamical network calculations for the most likely astrophysical r-process scenario, i.e. the high-entropy wind (HEW) of core-collapse type II supernovae (SN II). Again, an excellent reproduction of all observables for the ``main'' r-process has been achieved. However, a major difference is the nucleosynthesis origin of the lighter heavy elements in the 29<=Z<=45 mass region. Here, the HEW model predicts-instead of a ``weak'' neutron-capture r-process component-a primary rapid charged-particle process. This may explain the recent observations of a non-correlation of these elements with the heavier ``main'' r-process elements.
Farouqi Khalil
Kratz Karl Ludwig
Mashonkina Lyudmila I.
Pfeiffer Bernd
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