Measurement of $d{+}^7$Be cross sections for Big-Bang nucleosynthesis

Abstract

The cross sections of nuclear reactions between the radioisotope ${}^7$Be 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 MeV 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 ${}^7$Li, but not sufficiently to solve the primordial lithium problem.

6 pages, 6 figures

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• New Thermonuclear Rate of 7Li(d,n)24He relevant to the Cosmological Lithium Problem
• Progress in Nuclear Astrophysics of East and Southeast Asia
• Cosmological Parameter Estimation with a Joint-Likelihood Analysis of the Cosmic Microwave Background and Big Bang Nucleosynthesis
• Study of the ${}^7$Be($d$,${}^3$He)${}^6$Li* reaction at 5 MeV/u