For the first time in an application to nuclear astrophysics, a process induced by the unstable \(^5\)He = (\(^4\)He-n) nucleus, the \(^3\)He+\(^5\)He\(\rightarrow \)2\(\alpha \) reaction, has been studied through the Trojan Horse Method (THM). For that purpose, the quasi-free (QF) contribution of the \(^9\)Be(\(^3\)He,\(\alpha \alpha \))\(^4\)He reaction was selected at \(E_{^{3}\text{ He }}=4\) MeV incident energy. The reaction was studied in a kinematically complete experiment following a recent publication (Spitaleri et al. in Eur Phys J A 56:18, 2020), where for the quasi free contribution the momentum distribution between \(\alpha \) and \(^5\)He particle cluster in the \(^9\)Be nucleus in the ground state have been extracted. The angular distribution of the QF \(^3\)He+\(^5\)He\(\rightarrow \)2\(\alpha \) reaction was measured at \(\theta _{cm}\) = 78\(^{\circ }\)–115\(^{\circ }\). The energy dependence of the differential cross section of the \(^3\)He+\(^5\)He\( \rightarrow \)2\(\alpha \) virtual reaction was extracted in the energy range \(E_{cm}\) = 0–650 keV. The total cross section obtained from the Trojan-horse method was normalized to absolute cross sections from a theoretical calculation in the energy range \(E_{cm}\) =300–620 keV.

在不稳定的\（^ 5 \） He =（\（^ 4 \） He-n）核，\（^ 3 \） He + \（^ 5 ）诱导的过程中，这是第一次应用于核天体物理学。\）他\（\ rightarrow \） 2 \（\ alpha \）反应已通过特洛伊木马方法（THM）进行了研究。为此，在以下位置选择了\（^ 9 \） Be（\（^ 3 \） He，\（\ alpha \ alpha \）\（^ 4 \） He反应的准无（QF）贡献\（E _ {^ {3} \ text {He}} = 4 \） MeV入射能量。在最近的出版物（Spitaleri等人在Eur Phys JA 56:18，2020）之后的运动学完全实验中研究了该反应，其中对于准自由贡献，\（\ alpha \）和\（^ 5之间的动量分布\）提取了处于基态的（^ 9 \） Be核中的粒子簇。QF \（^ 3 \） He + \（^ 5 \） He \（\ rightarrow \） 2 \（\ alpha \）反应的角分布在\（\ theta _ {cm} \） = 78 \ （^ {\ circ} \）– 115 \（^ {\ circ} \）。\（^ 3 \）的微分截面的能量依赖性He + \（^ 5 \） He \（\ rightarrow \） 2 \（\ alpha \）在能量范围\（E_ {cm} \） = 0–650 keV中提取了虚拟反应。从Trojan-horse方法获得的总横截面根据能量范围\（E_ {cm} \） = 300–620 keV中的理论计算被归一化为绝对横截面。