论文标题
$^7 $ be（d，p）$^8 $ be $^\ ast $中的共振激发来解决宇宙锂问题
Resonance excitations in $^7$Be(d,p)$^8$Be$^\ast$ to address the cosmological lithium problem
论文作者
论文摘要
锂丰度的异常是核天体物理学中众所周知的未解决的问题。最近对这个问题的重新审视尝试了共振途径的增强途径，以说明标准大爆炸核合成（BBN）中原始$^7 $ li的丰度。 $^7 $ be（d，p）$^8 $ be*反应的事先测量无法解释所涉及的不同激发态的个人贡献，尤其是在接近反应Q值的较高能量下。我们在Cern的Hie-Isolde进行了一项实验，以E $ _ {CM} $ = 7.8 MEV研究此反应，在$^8 $中填充了高达22 MeV的激发，这是第一次。已经测量了几个激发态的角度分布，并使用TALYS代码通过外推到Gamow窗口，在相关的大键能在总横截面中较高激发态的贡献。结果表明，通过包括16.63 MEV状态的贡献，与早期100 MEV b的估计值相比，Gamow窗口内S因子总数的最大值为167 MEV B。但是，这仍然没有解释锂的差异。
The anomaly in lithium abundance is a well-known unresolved problem in nuclear astrophysics. A recent revisit to the problem tried the avenue of resonance enhancement to account for the primordial $^7$Li abundance in standard big-bang nucleosynthesis (BBN). Prior measurements of the $^7$Be(d,p)$^8$Be* reaction could not account for the individual contributions of the different excited states involved, particularly at higher energies close to the Q-value of the reaction. We carried out an experiment at HIE-ISOLDE, CERN to study this reaction at E$_{cm}$ = 7.8 MeV, populating excitations up to 22 MeV in $^8$Be for the first time. The angular distributions of the several excited states have been measured and the contributions of the higher excited states in the total cross section at the relevant big-bang energies were obtained by extrapolation to the Gamow window using the TALYS code. The results show that by including the contribution of the 16.63 MeV state, the maximum value of the total S-factor inside the Gamow window comes out to be 167 MeV b as compared to earlier estimate of 100 MeV b. However, this still does not account for the lithium discrepancy.
