University of Minnesota
School of Physics & Astronomy

Physics and Astronomy Calendar

Wednesday, March 4th 2015
1:25 pm:
Nuclear Physics Seminar in 435 Physics
Speaker:  Zhu Li, University of Minnesota
Subject: Study on Nucleosynthesis of Low Mass Supernovae

Low-mass ( 8-10 solar masses) supernovae (ECSNe) which result from the collapse of O-Ne-Mg cores triggered by electron capture could provide a source of elements heavier than iron. The yields of nucleosynthesis for a 8.8 solar mass ECSN was studied based on the hydrodynamic simulation with state-of-art treatment for neutrino transport. In terms of the yield relative to iron, this nucleosynthesis is dominated by Sc and Co, and is very different from that for a regular supernova (heavier than 10 solar masses). Further, some proton-rich nuclei could be synthesized in significant amounts even in ECSN ejecta with equal number of protons and neutrons. Neutrino interactions on light nuclei are observed to smooth the yields of heavy nuclei. These results are analyzed using the theory of quasi-equilibrium nucleosynthesis. Due to their relatively clear nucleosynthetic signatures, the contributions of ECSNe could be inferred from the abundances in some extremely metal-poor stars with high [Sc/Fe] and [Co/Fe].

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