Production of 9Be through alpha-fusion reaction of metal-poor cosmic ray
  and stellar flare
  Spectroscopic observations of metal-poor stars have indicated possible 6Li
abundances that are much larger than the primordial abundance predicted in the
standard big bang nucleosynthesis model. Possible mechanisms of 6Li production
in metal-poor stars include pregalactic and cosmological cosmic ray (CR)
nucleosynthesis and nucleosynthesis by flare-accelerated nuclides. We study 9Be
production via two-step alpha-fusion reactions of CR or flare-accelerated 3,4He
through 6He and 6,7Li, in pregalactic structure, intergalactic medium, and
stellar surfaces. We solve transfer equations of CR or flare particles and
calculate nuclear yields of 6He, 6,7Li, and 9Be taking account of probabilities
of processing 6He and 6,7Li into 9Be via fusions with alpha particles. Yield
ratios, i.e., 9Be/6Li, are then calculated for the CR and flare nucleosynthesis
models. We suggest that the future observations of 9Be in metal-poor stars may
find enhanced abundances originating from metal-poor CR or flare activities.
