Mainz 2012 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 62: Nukleare Astrophysik
HK 62.7: Vortrag
Freitag, 23. März 2012, 16:00–16:15, RW 2
Integrated nucleosynthesis in neutrino-driven winds — •Lutz Huther1,2, Tobias Fischer1,2, Gabriel Martinez-Pinedo1,2, and Karlheinz Langanke1,2,3 — 1TU Darmstadt, Darmstadt — 2GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt — 3Frankfurt Institute for Advanced Studies, Frankfurt
The neutrino driven wind from core collapse supernova is considered as one of the sources of elements heavier than iron. However, its contribution to different elements and its dependence with progenitor mass has not yet been determined. We perform a detailed nucleosynthesis study based on recent long-time simulations using Boltzmann neutrino transport. These simulations have been performed for stars of different progenitor masses (8.8, 10.8 and 18.0 M⊙) and for times of several tens of seconds after the onset of the explosion. The ejected matter is always proton rich. Using an extended nuclear network that includes all relevant nuclear and weak processes, we have determined the integrated nucleosynthesis outcome and its sensitivity to the progenitor mass. We show that proton rich winds can account for the metal-poor star observations of light r-process elements, Z<56. Furthermore depending on the late time dynamics of the ejecta, we find that after the freeze-out of proton captures at temperatures around 1 GK, there is a phase dominated by neutron captures that drives material to the neutron rich side of stability. During this phase the elemental abundances do not change, but the resulting isotopic abundances are in agreement with solar system abundances.