Tuesday, November 27, 2012

1211.5860 (P. Banerjee et al.)

Neutrino-Induced Production of 9Be in Core-Collapse Supernovae    [PDF]

P. Banerjee, Y. -Z. Qian, W. C. Haxton, A. Heger
We present two new mechanisms for neutirno-induced production of 9Be in core-collapse supernovae. In both cases, neutrino reactions in He shells produce 3H, which then makes 7Li through 4He(3H,gamma)7Li. For progenitors of ~8 M_sun, the shocked He-shell material rapidly expands, allowing production of 9Be through 7Li(3H,n_0)9Be. For ultra-metal-poor progenitors of ~11-15 M_sun, neutrons generated by neutrino reactions in He shells lead to both 7Li(n,gamma)8Li(n,gamma)9Li and a rapid neutron-capture process, depending on details of neutrino spectra, flavor oscillations, and the explosion. We discuss the associated production of 7Li and 11B, related mechanisms for 9Be production that might operate in other sites, and consistency of the identified mechanisms with the observational data.
View original: http://arxiv.org/abs/1211.5860

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