$^{22}$ Mg($α$,p)$^{25}$ Al的首次直接测量及其对X射线爆裂模型的影响-观察比较
First direct measurement of $^{22}$Mg($α$,p)$^{25}$Al and implications for X-ray burst model-observation comparisons
摘要:
I型X射线爆发(XRB)光变曲线对模型的核输入敏感,因此影响模型与观测的比较。$^{22}$ Mg($α$,p)$^{25}$ Al是直接影响XRB光变曲线的最重要的反应之一。我们首次报道了用有源靶时间投影室对$^{22}$ Mg($α$,p)$^{25}$ Al的直接测量。XRB光变曲线模型-观测比较源$\tt{GS 1826-24}$使用新的反应速率意味着一个不太紧凑的中子星比以前推断。此外,我们的结果消除了XRB模型计算中的一个重要的不确定性,以前阻碍了中子星紧凑性的提取。
英文摘要:
Type-I X-ray burst (XRB) light curves are sensitive to the model's nuclear input and consequently affects the model-observation comparisons. $^{22}$Mg($α$,p)$^{25}$Al is among the most important reactions which directly impact the XRB light curve. We report the first direct measurement of $^{22}$Mg($α$,p)$^{25}$Al using the Active Target Time Projection Chamber. XRB light curve model-observation comparison for the source $\tt{GS 1826-24}$ using new reaction rate implies a less-compact neutron star than previously inferred. Additionally, our result removes an important uncertainty in XRB model calculations that previously hindered extraction of the neutron star compactness.
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