Physics – Nuclear Physics
Scientific paper
Oct 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aps..dnp..a104w&link_type=abstract
American Physical Society, Division of Nuclear Physics Meeting, October 28-31, 1998 Santa Fe, New Mexico, abstract #A1.04
Physics
Nuclear Physics
Scientific paper
Nuclear Astrophysics is concerned with the study of nuclear reactions at stellar temperature and density conditions investigating the nucleosynthesis and energy generation of stellar processes. Detailed understanding of nuclear processes and improved observational data allow a highly sophisticated analysis of the hydrodynamic conditions in static and dynamic stellar processes. Presently the field faces challenges on two frontiers. The first frontier involves the investigation of nucleosynthesis in main sequence stars, in red giants, in asymptotic giant stars, and during late evolution of massive stars. This requires an extension of the measurements on stable nuclei towards the stellar low energy regime. Many of these reactions have been studied extensively at higher energies, but no data exist for cross sections in the stellar energy range. Therefore, possible low energy resonances and subthreshold resonance contributions are often not included for the stellar reaction rates. These uncertainties can only be removed by experiments at low energy, high current accelerators with state of the art detection systems. The second frontier in nuclear astrophysics is concerned with hot and explosive stellar scenarios and the concomitant nucleosynthesis involving nuclear processes far off β--stability. These nuclear processes can be measured by using radioactive ion beams or radioactive targets. Limitations for these experiments are low beam intensities and high background radiation. Several radioactive beam facilities are already in operation and more are expected based on improved technological developments allowing reliable studies of reaction processes far off stability. In this talk, I will summarize the astrophysically important nucleosynthesis processes and identify the need for nuclear data. The interpretation of these processes and their influence on nucleosynthesis will be demonstrated on selected examples.
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