rp-process nucleosynthesis at extreme temperature and density conditions

Schatz, H. and Aprahamian, A. and Gorres, J. and Wiescher, M. and Rauscher, T. and Rembges, J. F. and Thielemann, F. K. and Pfeiffer, B. and Moller, P. and Kratz, K. L. and Herndl, H. and Brown, B. A. and Rebel, H.. (1998) rp-process nucleosynthesis at extreme temperature and density conditions. Physics reports, Vol. 294, H. 4. pp. 167-263.

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Official URL: http://edoc.unibas.ch/dok/A5839346

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We present nuclear reaction network calculations to investigate the influence of nuclear structure on the rp-process between Ge and Sn in various scenarios. Due to the lack of experimental data for neutron-deficient nuclei in this region, we discuss currently available model predictions for nuclear masses and deformations as well as methods of calculating reaction rates (Hauser-Feshbach) and beta-decay rates (QRPA and shell model). In addition, we apply a valence nucleon (NpNn) correlation scheme for the prediction of masses and deformations. We also describe the calculations of 2p-capture reactions, which had not been considered before in this mass region. We find that in X-ray bursts 2p-capture reactions accelerate the reaction flow into the Z greater than or equal to 36 region considerably. Therefore, the rp-process in most X-ray bursts does not end in the Z = 32-36 region as previously assumed and overproduction factors of 10(7)-10(8) are reached for some light p-nuclei in the A = 80-100 region. This might be of interest in respect of the yet unexplained large observed solar system abundances of these nuclei. Nuclei in this region can also be produced via the rp-proces in accretion disks around low mass black holes. Our results indicate that the rp-process energy production in the Z < 32 region cannot be neglected in these scenarios. We discuss in detail the influence of the various nuclear structure input parameters and their current uncertainties on these results. It turns out that rp-process nucleosynthesis is mainly determined by nuclear masses and beta-decay rates of nuclei along the proton drip line. We present a detailed list of nuclei for which mass or beta-decay rate measurements would be crucial to further constrain the models. (C) 1998 Elsevier Science B.V.
Faculties and Departments:05 Faculty of Science > Departement Physik > Former Organization Units Physics > Theoretische Physik Astrophysik (Thielemann)
UniBasel Contributors:Rauscher, Thomas
Item Type:Article, refereed
Article Subtype:Research Article
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:14 Sep 2012 07:18
Deposited On:14 Sep 2012 06:44

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