Impact of uncertainties in reaction Q values on nucleosynthesis in type I x-ray bursts
Impact of uncertainties in reaction Q values on nucleosynthesis in type I x-ray bursts
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DOI：
10.1103/physrevc.79.045802
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发表时间：
2008-11
影响因子：
3.1
通讯作者：
A. Parikh;J. José;C. Iliadis;F. Moreno;T. Rauscher
中科院分区：
文献类型：
--
作者：
A. Parikh;J. José;C. Iliadis;F. Moreno;T. Rauscher
I型X射线暴中的核合成可能涉及多达数千个核过程。由于缺乏足够的实验信息，这些过程中的大多数仅在理论上确定。准确的反应$Q$-值对于反应速率的可靠理论估计是必不可少的。这些反应与小Q值（11兆电子伏）是特别感兴趣的，在这些环境中，因为它们可能代表了一个连续的丰度流向更大质量的核的等待点。为了探索这些等待点的性质，我们已经进行了一系列全面的后处理计算，检查核合成的敏感性，在I型X射线暴反应$Q$-值的不确定性。我们讨论并列出了相对较少的临界质量，测量可以更好地约束我们的研究结果。特别是，我们强调测量$^{65}\mathrm{As}$的质量以获得$^{64}\mathrm{Ge}（p，\ensuremath{\gamma}）^{65}\mathrm{As}$反应的实验Q$值的重要性。
Nucleosynthesis in type I X-ray bursts may involve up to several thousand nuclear processes. The majority of these processes have only been determined theoretically due to the lack of sufficient experimental information. Accurate reaction $Q$-values are essential for reliable theoretical estimates of reaction rates. Those reactions with small $Q$-values ($l1$ MeV) are of particular interest in these environments as they may represent waiting points for a continuous abundance flow toward heavier-mass nuclei. To explore the nature of these waiting points, we have performed a comprehensive series of post-processing calculations which examine the sensitivity of nucleosynthesis in type I X-ray bursts to uncertainties in reaction $Q$-values. We discuss and list the relatively few critical masses for which measurements could better constrain the results of our studies. In particular, we stress the importance of measuring the mass of $^{65}\mathrm{As}$ to obtain an experimental $Q$-value for the $^{64}\mathrm{Ge}(p,\ensuremath{\gamma})^{65}\mathrm{As}$ reaction.