Issue |
EPJ Web of Conferences
Volume 109, 2016
The 13th International Symposium on Origin of Matter and Evolution of Galaxies (OMEG2015)
|
|
---|---|---|
Article Number | 06001 | |
Number of page(s) | 6 | |
Section | Explosive Stellar Objects and Nuclear Physics | |
DOI | https://doi.org/10.1051/epjconf/201610906001 | |
Published online | 12 February 2016 |
https://doi.org/10.1051/epjconf/201610906001
Neutrino-Induced Nucleosynthesis in Helium Shells of Early Core-Collapse Supernovae
1 School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
2 Monash Center for Astrophysics, School of Physics and Astronomy, Monash University, Victoria 3800, Australia
3 Department of Physics, University of California Berkeley, Berkeley, California 94620, USA
4 Lawrence Berkeley National Laboratory, Berkeley, California 94620, USA
5 Center for Nuclear Astrophysics, INPAC, Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, Peoples Republic of China
a e-mail: banerjee@physics.umn.edu
Published online: 12 February 2016
We summarize our studies on neutrino-driven nucleosynthesis in He shells of early core-collapse supernovae with metallicities of Z ≲ 10−3 Z⊙. We find that for progenitors of ∼ 11–15 M⊙, the neutrons released by 4He(e, 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−
e)9Be and relies on a low explosion energy for its survival. The second mechanism operates in progenitors of ∼ 8 M⊙, 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.
© Owned by the authors, published by EDP Sciences, 2016
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.