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Composition of the innermost core collapse supernova ejecta and the νp-Process

Fröhlich, C. and Liebendörfer, M. and Martnez-Pinedo, G. and Thielemann, F. -K. and Bravo, E. and Zinner, N. T. and Hix, W. R. and Langanke, K. and Mezzacappa, A. and Nomoto, K.. (2006) Composition of the innermost core collapse supernova ejecta and the νp-Process. In: Origin of matter and evolution of galaxies, AIP Conference Proceedings ; 847. Woodbury, NY, pp. 333-338.

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Official URL: http://edoc.unibas.ch/dok/A5253786

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Abstract

With presently known input physics and computer simulations in 1D, a self-consistent treatment of core collapse supernovae does not lead to explosions, while 2D models show some promise. Thus, there are strong indications that the delayed neutrino mechanism works combined with a multi-D convection treatment for unstable layers. On the other hand there is a need to provide correct nucleosynthesis abundances for the progressing field of galactic evolution and observations of low metallicity stars. The innermost ejecta is directly affected by the explosion mechanism, i.e. most strongly the yields of Fe-group nuclei for which an induced piston or thermal bomb treatment will not provide the correct yields because the effect of neutrino interactions is not included. We apply parameterized variations to the neutrino scattering cross sections and alternatively, parameterized variations to the neutrino absorption cross sections on nucleons in the "gain region". We find that both measures lead to similar results, causing explosions and a Ye larger than 0.5 in the innermost ejected layers, due to the combined effect of a short weak interaction time scale and a negligible electron degeneracy, unveiling the proton-neutron mass difference. The proton-rich environment results in enhanced abundances of 45Sc, 49Ti, and 64Zn as requested by chemical evolution studies and observations of low metallicity stars. Moreover, antineutrino capture on the free protons allows for an appreciable production of nuclei in the mass range up to A = 80 by the νp-process.
Faculties and Departments:05 Faculty of Science > Departement Physik > Former Organization Units Physics > Astrophysik (Liebendörfer)
05 Faculty of Science > Departement Physik > Physik > Theoretische Physik Astrophysik (Thielemann)
UniBasel Contributors:Liebendörfer, Matthias and Fröhlich, Carla and Thielemann, Friedrich-Karl
Item Type:Conference or Workshop Item, refereed
Conference or workshop item Subtype:Conference Paper
Bibsysno:Link to catalogue
Publisher:AIP Press
Note:Variant title: Composition of the innermost core collapse supernova ejecta and the nu p-Process -- Publication type according to Uni Basel Research Database: Conference paper
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Last Modified:04 Sep 2015 14:31
Deposited On:22 Mar 2012 13:56

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