Measurement of Near-Threshold Resonances in 9B for Big Bang Nucleosynthesis
ORAL
Abstract
The Primordial Lithium Problem remains one of the largest discrepancies between calculation and observation for Standard Big Bang Nucleosynthesis (SBBN), where the calculated value of the 7Li abundance is a factor of 3-4 times larger than the observed value. To alleviate this tension, nuclear reactions which could potentially destroy mass-7 nuclei must be investigated. Of particular interest is the reaction 7Be+d→2α+p; resonances in the 9B compound near the deuteron threshold have been the subject of some investigation. Recent measurements using the Super Enge Split-Pole Spectrograph (SESPS) and the Silicon Array for Branching Ratio Experiments (SABRE) at Florida State University, a potential resonance in 10B(3He, α)9B→7Be+d was identified at even lower resonance energy than the previously known 16.8 MeV resonance in 9B. Subsequently, a repeat investigation with additional emphasis on the p+8Be branch was performed to further investigate this structure. Results and impact on SBBN will be discussed.
*This work was supported by NSF Grants PHY-1712953, PHY-2012522, PHY-1429019, DOE contracts DE-SC0014231 and DE-FG0296ER40978, as well as National Nuclear Security Administration under Grant No. DE-NA0003841
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Presenters
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Gordon W McCann
- Florida State University