Pregalactic LiBeB Production by Supernova Cosmic Rays

Abstract

I calculate the evolution of Be and B abundances produced by cosmic rays generated by massive stars in the pregalactic phase of the universe. The inputs for calculation, i.e. the star formation rate and the nuclear abundances of cosmic rays, which I assume to be the same as those of the ISM, are taken from the results of a detailed cosmic chemical evolution model with its parameters best fitted from several items of observational information including an early reionization of the IGM by $z\sim 15$. I found that when the ${}^6$Li plateau abundance observed in metal-poor halo stars originated in the pregalactic cosmological cosmic ray nucleosynthesis, Be and B simultaneously produced with ${}^6$Li amount to the lowest levels ever detected in metal-poor halo stars. It is desirable to observe Be and B abundances in metal-poor halo stars with [Fe/H]$\le -3$ in order to elucidate the possibility of early ${}^6$LiBeB production by pregalactic supernova cosmic ray nucleosynthesis.

13 pages, 8 figures, ApJ accepted

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Cited by in corpus (11)

• BD +44 493: A Ninth Magnitude Messenger from the Early Universe; Carbon Enhanced and Beryllium Poor
• Effect of Long-lived Strongly Interacting Relic Particles on Big Bang Nucleosynthesis
• General limit on the relation between abundances of D and ${}^7$Li in big bang nucleosynthesis with nucleon injections
• New results on catalyzed BBN with a long-lived negatively-charged massive particle
• Destruction of 7Be in big bang nucleosynthesis via long-lived sub-strongly interacting massive particles as a solution to the Li problem
• Origin and Impacts of the First Cosmic Rays
• Resonant annihilation of long-lived massive colored particles through hadronic collisions
• Inhomogeneity in the early Galactic chemical enrichment exposed by beryllium abundances in extremely metal-poor stars
• Stellar abundances of beryllium and CUBES
• Production of 9Be through alpha-fusion reaction of metal-poor cosmic ray and stellar flare
• Big Bang Nucleosynthesis with long-lived strongly interacting relic particles