期刊
PHYSICAL REVIEW LETTERS
卷 122, 期 18, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.122.182701
关键词
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资金
- National Science Foundation [PHY-1401574, PHY-1712953, PHY-0820941]
- U.S. Department of Energy, Office of Science [DE-FG02-96ER40978, DE-FG02-93ER40773]
- Welch Foundation [A-1853]
The cross sections of nuclear reactions between the radioisotope Be-7 and deuterium, a possible mechanism of reducing the production of mass-7 nuclides in big-bang nucleosynthesis, were measured at center-of-mass energies between 0.2 and 1.5 MeV. The measured cross sections are dominated by the (d, alpha) reaction channel, towards which prior experiments were mostly insensitive. A new resonance at 0.36(5) MeV with a strength of omega gamma = 1.7(5) keV was observed inside the relevant Gamow window. Calculations of nucleosynthesis outcomes based on the experimental cross section show that the resonance reduces the predicted abundance of primordial Li-7, but not sufficiently to solve the primordial lithium problem.
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