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
Title of host publicationThe 13th international symposium on Origin of Matter and Evolution of Galaxies (OMEG 2015)
EditorsWeiping Liu, Zhihong Li, Youbao Wang, Bing Guo, Yangping Shen
Place of PublicationLes Ulis France
PublisherEDP Sciences
Number of pages6
Publication statusPublished - 2016
EventInternational Symposium on Origin of Matter and Evolution of Galaxies (OMEG) 2015 - Prime Hotel, Beijing, China
Duration: 24 Jun 201527 Jun 2015
Conference number: 13th


ConferenceInternational Symposium on Origin of Matter and Evolution of Galaxies (OMEG) 2015
Abbreviated titleOMEG 2015
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