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 ${}^7\mathrm{Li}$ abundance in standard big-bang nucleosynthesis. Prior measurements of the ${}^7\mathrm{Be}(d,p){}^8{\mathrm{Be}}^{*}$ 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 $E_{\mathrm{c}.\mathrm{m}.}=7.8\mathrm{MeV}$, populating excitations up to 22 MeV in ${}^8\mathrm{Be}$ 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.

中文翻译：

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Be7(d,p)Be*8 中的共振激发解决宇宙锂问题

锂丰度异常是核天体物理学中众所周知的未解决问题。最近对该问题的重新审视尝试了共振增强的途径来解释原始${}^7李$标准大爆炸核合成的丰度。之前的测量${}^7是(d,p){}^8{是}^{*}$反应不能解释所涉及的不同激发态的个体贡献，特别是在接近$问$反应的价值。我们在欧洲核子研究中心的 HIE-ISOLDE 进行了一项实验来研究这种反应${乙}_{\mathrm{C}.\mathrm{米}.}=7.8\mathrm{电子伏特}$，填充高达 22 MeV 的激发${}^8是$首次。已经测量了几个激发态的角分布，并且使用talys代码通过外推到 Gamow 窗口获得了更高激发态在相关大爆炸能量下的总横截面中的贡献。结果表明，通过包括 16.63 MeV 状态的贡献，总的最大值$\mathrm{小号}$与之前估计的 100 MeV b 相比，Gamow 窗口内的因子为 167 MeV b。然而，这仍然不能解释锂的差异。