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

Projjwal Banerjee; Yong-Zhong Qian; Alexander Heger; Wick Haxton

doi:10.1051/epjconf/201610906001

All issues

Volume 109 (2016)

EPJ Web of Conferences, 109 (2016) 06001

Abstract

Open Access

Issue		EPJ Web of Conferences Volume 109, 2016 The 13^th 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

EPJ Web of Conferences 109, 06001 (2016)
https://doi.org/10.1051/epjconf/201610906001

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

Projjwal Banerjee¹^a, Yong-Zhong Qian¹^,5, Alexander Heger²^,5 and Wick Haxton³^,4

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

Abstract

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( ${\bar{ν}}_{e}$ _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⁻ ${\bar{ν}}_{e}$ _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.

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.

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