核反应的共振增强作为宇宙学锂问题的可能解决方案
Resonant enhancement of nuclear reactions as a possible solution to the cosmological lithium problem
摘要：
目前宇宙学锂丰度的理论预测与观测推断的值之间存在显著差异，其中大部分是在大爆炸期间以Be 7产生的。我们调查是否共振增强的Be 7燃烧反应可以减轻这种差异。我们在B 9中发现了一个窄核能级，E_{5/2^+} \simeq 16.7 MeV，该能级在实验上没有得到充分的研究，并且仅比Be 7 +d阈值高\sim 200 keV，这可能导致Be 7（d，γ）B 9和Be 7（d，p）αα反应的共振增强。我们确定了导致宇宙学锂丰度显著减少的氘分离宽度Γ d与共振能量范围E_r之间的关系，发现（E_r，~Γ_{d}）\simeq（170-220，~10-40）keV可以消除电流差异。只有当电子进入通道的相互作用半径非常大时，才能在该共振能量下获得如此大的宽度，a_{27} \ge 9 fm。我们的研究结果还表明，在专门的核实验和理论工作，以澄清所发挥的作用，这种共振，目前保守的BBN预测锂丰度应携带显着更大的误差棒，[Li 7/H]_{ \rm BBN} =（2.5-6）\times 10^{-10}。
英文摘要：
There is a significant discrepancy between the current theoretical prediction of the cosmological lithium abundance, mostly produced as Be7 during the Big Bang, and its observationally inferred value. We investigate whether the resonant enhancement of Be7 burning reactions may alleviate this discrepancy. We identify one narrow nuclear level in B9, E_{5/2^+} \simeq 16.7 MeV that is not sufficiently studied experimentally, and being just \sim 200 keV above the Be7+d threshold, may lead to the resonant enhancement of Be7(d,γ)B9 and Be7(d,p)ααreactions. We determine the relationship between the domain of resonant energies E_r and the deuterium separation width Γ_d that results in the significant depletion of the cosmological lithium abundance and find that (E_r, ~Γ_{d}) \simeq (170-220,~10-40) keV can eliminate current discrepancy. Such a large width at this resonant energy can be only achieved if the interaction radius for the deterium entrance channel is very large, a_{27} \ge 9 fm. Our results also imply that before dedicated nuclear experimental and theoretical work is done to clarify the role played by this resonance, the current conservative BBN prediction of lithium abundance should carry significantly larger error bars, [Li7/H]_{\rm BBN} = (2.5-6)\times 10^{-10}.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
