Abstract
The astrophysical reaction occurs during Big Bang nucleosynthesis and the pre-main sequence and main sequence phases of stellar evolution. The low-energy trend of its cross section remains uncertain, since different measurements have provided conflicting results. A recent experiment reported a resonancelike structure at center-of-mass energy 195 keV, associated to a positive-parity state of . The existence of such resonance is still a matter of debate. We report a new measurement of the cross section performed at the Laboratory for Underground Nuclear Astrophysics, covering the center-of-mass energy range –350 keV. Our results rule out the existence of low-energy resonances. The astrophysical -factor varies smoothly with energy, in agreement with theoretical models.
- Received 20 May 2020
- Revised 10 July 2020
- Accepted 7 October 2020
DOI:https://doi.org/10.1103/PhysRevC.102.052802
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