Neutrino-Induced Nucleosynthesis in Helium Shells of Early Core-Collapse Supernovae

Projjwal Banerjee, Yong Zhong Qian, Alexander Heger, Wick Haxton

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We summarize our studies on neutrino-driven nucleosynthesis in He shells of early core-collapse supernovae with metallicities of Z ≤ 10-3 ZȮ. We find that for progenitors of ∼ 11-15 MȮ, the neutrons released by 4He(ν¯ee, e+n)3H in He shells can be captured to produce nuclei with mass numbers up to A ∼ 200. This mechanism is sensitive to neutrino emission spectra and flavor oscillations. In addition, we find two new primary mechanisms for neutrino-induced production of 9Be in He shells. The first mechanism produces 9Be via 7Li(n,γ)8Li(n,γ)9Li(e- ν¯ee)9Be and relies on a low explosion energy for its survival. The second mechanism operates in progenitors of ∼ 8 MȮ, where 9Be can be produced directly via 7Li(3H, n0)9Be during the rapid expansion of the shocked Heshell material. The light nuclei 7Li and 3H involved in these mechanisms are produced by neutrino interactions with 4He. We discuss the implications of neutrino-induced nucleosynthesis in He shells for interpreting the elemental abundances in metal-poor stars.

Original languageEnglish (US)
Article number06001
JournalEPJ Web of Conferences
StatePublished - Feb 12 2016
Event13th International Symposium on Origin of Matter and Evolution of Galaxies, OMEG 2015 - Beijing, China
Duration: Jun 24 2015Jun 27 2015

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© 2016 Owned by the authors, published by EDP Sciences.


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