$^{16}$ O($\gamma$, $\alpha$) $^{12}$ C测量对$^{12}$ C($\alpha,\gamma$) $^{16}$ O天体物理反应速率的影响

R. Holt, B. Filippone, S. Pieper
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引用次数: 2

摘要

$^{12}$ C($\alpha,\gamma$) $^{16}$ O反应是恒星氦燃烧的重要组成部分,在核天体物理中起着关键作用。它直接影响到大质量恒星的演化和最终状态,同时也影响到这些恒星中核合成产生的元素丰度。在恒星氦燃烧温度下,对这种反应的能量依赖性提供可靠的估计一直是该领域的主要目标。在这项工作中,我们研究了可逆反应$^{16}$ O($\gamma,\alpha$) $^{12}$ C的潜在新测量方法在降低总体不确定度方面的作用。用多水平r矩阵分析对300 keV恒星能量反应的天体物理S因子进行外推。s因子外推的统计精度是通过对现有的E1和E2基态捕获数据进行多次拟合来确定的,包括未来可能测量的$^{16}$ O($\gamma,\alpha$) $^{12}$ C反应的影响。特别是,我们考虑了一个提议的JLab实验,该实验将利用高强度低能轫致辐射束撞击富氧单流体气泡室,以测量逆反应的总横截面。探讨了低能数据和高精度数据的重要性。
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Impact of $^{16}$O($\gamma$,$\alpha$)$^{12}$C measurements on the $^{12}$C($\alpha,\gamma$)$^{16}$O astrophysical reaction rate
The $^{12}$C($\alpha,\gamma$)$^{16}$O reaction, an important component of stellar helium burning, plays a key role in nuclear astrophysics. It has direct impact on the evolution and final state of massive stars, while also influencing the elemental abundances resulting from nucleosynthesis in such stars. Providing a reliable estimate for the energy dependence of this reaction at stellar helium burning temperatures has been a major goal for the field. In this work, we study the role of potential new measurements of the inverse reaction, $^{16}$O($\gamma,\alpha$)$^{12}$C, in reducing the overall uncertainty. A multilevel R-matrix analysis is used to make extrapolations of the astrophysical S factor for this reaction to the stellar energy of 300 keV. The statistical precision of the S-factor extrapolation is determined by performing multiple fits to existing E1 and E2 ground state capture data, including the impact of possible future measurements of the $^{16}$O($\gamma,\alpha$)$^{12}$C reaction. In particular, we consider a proposed JLab experiment that will make use of a high-intensity low-energy bremsstrahlung beam that impinges on an oxygen-rich single-fluid bubble chamber in order to measure the total cross section for the inverse reaction. The importance of low energy data as well as high precision data is investigated.
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