New primary mechanisms for the synthesis of rare be9 in early supernovae

Projjwal Banerjee, Yong Zhong Qian, W. C. Haxton, Alexander Heger

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We present two new primary mechanisms for the synthesis of the rare nucleus Be9, both triggered by ν-induced production of H3 followed by He4(H3,γ)Li7 in the He shells of core-collapse supernovae. For progenitors of ∼8M⊙, Li7(H3,n0)Be9 occurs during the rapid expansion of the shocked He shell. Alternatively, for ultra-metal-poor progenitors of ∼11-15M⊙, Li7(n,γ)Li8(n,γ)Li9(e-ν̄e)Be9 occurs with neutrons produced by He4(ν̄e,e+n)H3, assuming a hard effective ν̄e spectrum from oscillations (which also leads to heavy element production through rapid neutron capture) and a weak explosion (so the Be9 survives shock passage). We discuss the associated production of Li7 and B11, noting patterns in LiBeB production that might distinguish the new mechanisms from others.

Original languageEnglish (US)
Article number141101
JournalPhysical review letters
Issue number14
StatePublished - Apr 1 2013


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