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New Thermonuclear Rate of 7Li(d,n)24He Relevant to the Cosmological Lithium Problem

Journal Article · · The Astrophysical Journal
 [1];  [2];  [3];  [4];  [5];  [6]
  1. Chinese Academy of Sciences (CAS), Lanzhou (China); University of Chinese Academy of Sciences, Beijing (China); Chinese Academy of Sciences, Lanzhou (China)
  2. National Astronomical Observatory of Japan, Tokyo (Japan); University of Tokyo (Japan); Beihang University, Beijing (China)
  3. University of Hull, Kingston upon Hull (United Kingdom); Hungarian Academy of Sciences, Budapest (Hungary)
  4. University of Hull, Kingston upon Hull (United Kingdom); Hungarian Academy of Sciences, Budapest (Hungary); Michigan State University, East Lansing, MI (United States)
  5. National Astronomical Observatory of Japan, Tokyo (Japan); University of Tokyo (Japan)
  6. Texas A & M University, College Station, TX (United States)

Accurate 7Li(d,n)24 He thermonuclear reaction rates are crucial for precise prediction of the primordial abundances of lithium and beryllium and to probe the mysteries beyond fundamental physics and the standard cosmological model. However, uncertainties still exist in current reaction rates of 7Li(d,n)24 He widely used in big bang nucleosynthesis (BBN) simulations. In this work, we reevaluate the 7Li(d,n)24 He reaction rate using the latest data on the three near-threshold 9Be excited states from experimental measurements. We present for the first time uncertainties that are directly constrained by experiments. Additionally, we take into account for the first time the contribution from the subthreshold resonance at 16.671 MeV of 9Be. We obtain a 7Li(d,n)24 He rate that is overall smaller than the previous estimation by about a factor of 60 at the typical temperature of the onset of primordial nucleosynthesis. We implemented our new rate in BBN calculations, and we show that the new rates have a very limited impact on the final light element abundances in uniform density models. Typical abundance variations are in the order of 0.002%. For nonuniform density BBN models, the predicted 7 Li production can be increased by 10% and the primordial production of light nuclides with mass number A > 7 can be increased by about 40%. Our results confirm that the cosmological lithium problem remains a long-standing unresolved puzzle from the standpoint of nuclear physics.

Research Organization:
Texas A & M University, College Station, TX (United States)
Sponsoring Organization:
USDOE Office of Science (SC); Chinese Academy of Sciences; National Natural Science Foundation of China; National Science Foundation (NSF); Japan Society for the Promotion of Science (JSPS); University of Hull; Hungarian Academy of Sciences; European Cooperation in Science and Technology; European Union’s Horizon 2020
Grant/Contract Number:
FG02-08ER41533
OSTI ID:
1981225
Journal Information:
The Astrophysical Journal, Journal Name: The Astrophysical Journal Journal Issue: 2 Vol. 920; ISSN 0004-637X
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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