Neutron destruction reactions of the cosmic $\gamma$-ray emitter ${}^{26}\mathrm{Al}$ are of importance to determine the amount of ${}^{26}\mathrm{Al}$ ejected into our galaxy by supernova explosions and for ${}^{26}\mathrm{Al}$ production in asymptotic giant branch stars. We performed a new measurement of the ${}^{26}\mathrm{Al}(n,\alpha )$ reaction up to 160-keV neutron energy at the neutron time-of-flight facilities n_TOF at CERN and GELINA at EC-JRC. We provide strengths for ten resonances, six of them for the first time. We use our data to calculate astrophysical reactivities for stellar temperatures up to 0.7 GK. Our results resolve a discrepancy between the two previous direct measurements of this reaction, and indicate higher stellar destruction rates than the most recently recommended reactivity.

中文翻译：

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大质量恒星中宇宙γ射线发射体Al26的破坏：关键Al26(n,α)反应的研究

宇宙的中子破坏反应 $\gamma$-射线发射器 ${}^{26}铝$ 对确定数量很重要 ${}^{26}铝$ 被超新星爆炸喷射到我们的银河系中 ${}^{26}铝$在渐近巨星分支中产生。我们进行了新的测量${}^{26}铝(n,\alpha )$在欧洲核子研究中心的中子飞行时间设施 n_TOF 和 EC-JRC 的 GELINA 反应高达 160 keV 的中子能量。我们提供十个共振的强度，其中六个是第一次。我们使用我们的数据来计算恒星温度高达 0.7 GK 的天体物理反应性。我们的结果解决了之前对该反应的两次直接测量之间的差异，并表明比最近推荐的反应性更高的恒星破坏率。