Abstract
Proton capture reactions on proton rich radioactive nuclei play an important role in nucleosynthesis during explosive hydrogen burning via the r(apid) p(roton) process. Due to the usually short life times of the nuclei involved in such burning processes, little experimental information is available about the particular reaction cross sections and rates in such burning sequences. Model calculations for explosive nucleosynthesis processes in high temperature and density environments are currently based on estimates of these rates derived from nuclear structure information. We will discuss two specific examples, 19Ne(p,~)2ONa and 22Na(p,~)23Mg, an indirect and a direct approach for experimentally determining reaction cross sections and rates for proton capture on unstable target nuclei. Furthermore, we will present the first results of these experiments and will discuss the possible impact on explosive nucleosynthesis.
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