Measurement of $d + ^7$Be cross sections for Big-Bang nucleosynthesis
| Autor: | Rijal, N., Wiedenhöver, I., Blackmon, J. C., Anastasiou, M., Baby, L. T., Caussyn, D. D., Höflich, P., Kemper, K. W., Koshchiy, E., Rogachev, G. V. |
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| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Phys. Rev. Lett. 122, 182701 (2019) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.122.182701 |
| Popis: | 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. Comment: 6 pages, 6 figures |
| Databáze: | arXiv |
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