通过 Trojan Horse 方法在近 0 度旁观者探测下对 Gamow 能量处 $\rm {}^{12}C({}^{12}C,\mathit{p}){}^{23}Na$ 反应的 $\rm S^*(E)$ 因子的间接测量
Indirect Measurement of the $\rm S^*(E)$ Factor for $\rm {}^{12}C({}^{12}C,\mathit{p}){}^{23}Na$ at Gamow Energies via the Trojan Horse Method with Near-0 degree Spectator Detection
浏览论文内容
中文总结 AI 辅助
本研究利用 Trojan Horse 方法在近 0 度探测旁观者粒子，间接测量了 Gamow 能量下 12C+12C 反应的 S*(E) 因子，证实了共振结构并排除了阻碍效应，为恒星碳燃烧模型提供了关键数据。
中文摘要 AI 辅助
天体物理 S*(E) 因子在 Gamow 窗口内的 12C+12C 反应对于模拟恒星碳燃烧和爆炸性核合成场景起着关键作用。然而，在这些能量下的直接测量甚至简单外推都受到库仑抑制和可能存在的窄共振的严重阻碍。为应对这一挑战，我们在 HI-13 串列加速器上对 12C(16O,ap)23Na 反应进行了间接测量，采用 16O=(12C+a) 作为 Trojan Horse 核。这项 Trojan Horse 方法（THM）研究的一个关键创新是使用了铜束阻止箔，使得能够在近 0 度角区域探测旁观者粒子，在该区域准自由运动学下其产额最大。基于 DWBA 的 THM 形式体系提取了天体物理相关能量范围内 12C(12C,p)23Na 反应的 S*(E) 因子。我们的结果证实了在 Gamow 窗口内约 1.5 MeV 处 p0 和 p1 质子通道中均存在共振结构。在测量的能量范围内未观察到阻碍效应的证据。在不考虑共振细节的情况下，我们结果的总体趋势与 THM-Tumino2018 和 TTIK2025 数据在定性上合理一致，但与 Modified-THM-Muk2019 数据的趋势存在显著差异。
英文摘要
The astrophysical S*(E) factor for the 12C+12C reaction within the Gamow window plays a pivotal role in modeling stellar carbon burning and explosive nucleosynthesis scenarios. However, direct measurements or even simple extrapolations at these energies are severely hindered by Coulomb suppression and the possible presence of narrow resonances. To address this challenge, we performed an indirect measurement of the 12C(16O,ap)23Na reaction at the HI-13 Tandem Accelerator, employing 16O=(12C+a) as the Trojan Horse nucleus. A key innovation of this Trojan Horse Method (THM) study is the implementation of a copper beam-stopper foil, which enabled the detection of spectator particles near 0, the angular region where their yield is maximized under quasi-free kinematics. The S*(E) factor for the 12C(12C,p)23Na reaction in the astrophysically relevant energy range was extracted using the THM formalism based on the DWBA. Our results confirm the presence of resonant structures within the Gamow window around 1.5 MeV in both the p0 and p1 proton channels. No evidence of a hindrance effect is observed in the measured energy range. Without considering the resonance details, the overall trend of our results is qualitatively in reasonable agreement with the THM-Tumino2018 and TTIK2025 data, but differs significantly from the trend of the Modified-THM-Muk2019 data.
发表机构
- Institute of Radiation Technology, Beijing Academy of Science and Technology（北京应用技术研究院辐射技术研究所）
机构由 AI 辅助整理，请以论文原文为准。
