Computer Science
Scientific paper
Feb 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998ehba.book.....s&link_type=abstract
Explosive hydrogen burning at extreme temperature and density conditions., by Schatz, H.. Forschungszentrum Karlsruhe GmbH, Karl
Computer Science
6
Scientific paper
The impact of 2p-capture reactions on rp-process nucleosynthesis in novae and X-ray bursts was investigated. In this context an improved formalism for the calculation of 2p-capture reaction rates is presented. In addition, a new experimental technique is described that allows to investigate very proton rich nuclei using the (α,8He)-reaction. With this technique, the level energies of the first two excited states in 24Si have been determined for the first time to be 1.879±0.011 and 3.441±0.010 MeV. An improved value for the 28S mass excess of 4.192±0.034 MeV has also been measured. The new data allow a more accurate calculation of the 23Al(p,γ)24Si- and the 27P(p,γ)28S-reaction rate and thus of the 2p-capture rates of 22Mg and 26Si. Based on calculations with the improved reaction network it is shown that the new 2p-capture rate on 22Mg does not solve the discrepancy between the large 22Na yields predicted by some nova models and recent COMPTEL observations. For X-ray bursts, the first calculation of the full rp-process reaction path is presented. Since 2p-capture reactions accelerate the reaction flow considerably, the rp-process in a 23 s burst reaches nuclei as heavy as 98Cd. The rp-process above 56Ni doubles energy production and fuel consumption but does not lead to a complete exhaustion of hydrogen fuel. The energy production rate shows extreme variations, which could be observable in the burst profiles. The ashes of X-ray bursts consists of a whole range of elements between Zn and Ru and contains especially large amounts of the light p-nuclei 92Mo, 94Mo, 96Ru and 98Ru. If some of the burned material escapes into the interstellar medium, X-ray bursts could be the production site for the solar system abundances of these nuclei.
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