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首页> 外文期刊>Physical review, C >Sensitivity of the C-13(alpha, n)O-16 S factor to the uncertainty in the level parameters of the near-threshold state
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Sensitivity of the C-13(alpha, n)O-16 S factor to the uncertainty in the level parameters of the near-threshold state

机译：C-13（Alpha，N）O-16的敏感性在近阈值状态的水平参数中的不确定性

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摘要

The C-13(alpha, n)O-16 reaction is the main source of neutrons for the s and i processes in asymptotic giant branch stars and carbon-enhanced metal-poor stars, respectively. The reaction rate over the relevant temperature range from 0.1 to 0.3 GK translates into a center-of-mass energy range of 150 to 540 keV. Current measurements extend down to 300 keV, still requiring an extrapolation of the cross section. At these low energies, the high-energy tail of a 1/2(+) state near the reaction threshold makes a significant contribution to the cross section, but its amplitude is still highly uncertain. In this paper the uncertainties associated with the low-energy cross-section extrapolation are investigated, in particular the sensitivity to the energy, width, and Coulomb renormalized asymptotic normalization coefficient of the near-threshold resonance. Recently it has been suggested that the energy of the near-threshold level may have a large impact on the extrapolation, but this is not found to be the case compared with the other sources of uncertainty.
机译：C-13（α，N）O-16反应是S中中子的主要来源，我的渐近巨星恒星和碳增强金属贫恒星的过程分别。在相关温度范围内的反应速率从0.1到0.3GK转化为150至540keV的质量中心。电流测量延伸至300keV，仍需要横截面的外推。在这些低能量下，反应阈值附近的1/2（+）状态的高能量尾部对横截面产生了重大贡献，但其幅度仍然非常不确定。在本文中，研究了与低能量横截面外推相关的不确定性，特别是对近阈值共振的能量，宽度和库仑重整化渐近标准化系数的敏感性。最近，已经建议近阈值水平的能量可能对外推产生很大影响，但与其他不确定来源相比，没有发现这种情况。

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