Standard big bang nucleosynthesis with a nonthermal reaction network

Details Standard big bang nucleosynthesis with a nonthermal reaction network Standard big bang nucleosynthesis with a nonthermal reaction network

Mar 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012phrvd..85f7301v&link_type=abstract

Physical Review D, vol. 85, Issue 6, id. 067301

Astronomy and Astrophysics

Astrophysics

Big Bang Nucleosynthesis, Fundamental Aspects Of Astrophysics

Scientific paper

We discuss a refined scenario of standard big bang nucleosynthesis (BBN) allowing for nonthermal nuclear reactions in the primordial plasma. These reactions are naturally triggered in the early Universe by fast particles (n,p,t,He3,α) generated in the t(d,n)α, d(d,n)He3, d(d,p)t, and He3(d,p)α processes. We take into account the nonthermal channels for reactions between nuclei with A⩽7 (of the standard BBN network) and consider new processes, such as nucleon-induced breakups of fragile d, Li6,7, and Be7. It is shown that fast neutrons—the most abundant and hot nonthermal plasma species—can effectively maintain some reactions as the Universe cools. Depending on the type of an individual reaction, these neutrons can increase the reaction rate coefficient NA⟨σv⟩ by a few percent (for exoergic resonant processes) and orders of magnitude (for endoergic processes, such as the breakups and some reverse reactions). However, the individual nonthermal effects prove to be insufficient to influence the whole reaction kinetics and significantly change the predictions of thermal BBN. The nonthermal corrections to element abundances are found to be 0.10% (for T), -0.01% (for He3), -0.02% (for Li7), and 0.36%-0.60% (for CNO elements).

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