STANDARD BIG BANG NUCLEOSYNTHESIS UP TO CNO WITH AN IMPROVED EXTENDED NUCLEAR NETWORK

被引:164
作者
Coc, Alain [1 ]
Goriely, Stephane [2 ]
Xu, Yi [2 ]
Saimpert, Matthias [3 ]
Vangioni, Elisabeth [3 ]
机构
[1] Univ Paris 11, CNRS IN2P3, CSNSM, UMR 8609, F-91405 Orsay, France
[2] Univ Libre Bruxelles, Inst Astron & Astrophys, B-1050 Brussels, Belgium
[3] Univ Paris 06, UMR CNRS 7095, Inst Astrophys Paris, F-75014 Paris, France
关键词
cosmological parameters; early universe; nuclear reactions; nucleosynthesis; abundances; primordial nucleosynthesis; THERMONUCLEAR REACTION-RATES; PROBE WMAP OBSERVATIONS; REACTION CROSS-SECTION; PRIMORDIAL NUCLEOSYNTHESIS; ANGULAR-DISTRIBUTIONS; REACTION-MECHANISM; ELEMENTS; LITHIUM; BERYLLIUM; ABUNDANCE;
D O I
10.1088/0004-637X/744/2/158
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Primordial or big bang nucleosynthesis (BBN) is one of the three strong pieces of evidence for the big bang model together with the expansion of the universe and cosmic microwave background radiation. In this study, we improve the standard BBN calculations taking into account new nuclear physics analyses and enlarge the nuclear network up to sodium. This is, in particular, important to evaluate the primitive value of CNO mass fraction that could affect Population III stellar evolution. For the first time we list the complete network of more than 400 reactions with references to the origin of the rates, including approximate to 270 reaction rates calculated using the TALYS code. Together with the cosmological light elements, we calculate the primordial beryllium, boron, carbon, nitrogen, and oxygen nuclei. We performed a sensitivity study to identify the important reactions for CNO, Be-9, and boron nucleosynthesis. We re-evaluated those important reaction rates using experimental data and/or theoretical evaluations. The results are compared with precedent calculations: a primordial beryllium abundance increase by a factor of four compared to its previous evaluation, but we note a stability for B/H and for the CNO/H abundance ratio that remains close to its previous value of 0.7 x 10(-15). On the other hand, the extension of the nuclear network has not changed the Li-7 value, so its abundance is still 3-4 times greater than its observed spectroscopic value.
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页数:18
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