Experiments on screening effect in deuteron fusion reactions at extremely low energies
Experiments on screening effect in deuteron fusion reactions at extremely low energies
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极低能氘核聚变反应筛选效应实验
DOI：
10.1140/epjst/e2013-02016-9
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
H. Winter
中科院分区：
文献类型：
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作者：
N. Targosz;K. Czerski;A. Huke;G. Ruprecht;D. Weissbach;L. Martin;A. I. Kilic;M. Kaczmarski;H. Winter
在致密天体物理等离子体中发生的核反应中的电子屏蔽增强效应对于在地面实验室中确定恒星反应速率以及预测恒星内部截面增强（如白色、棕矮星或巨行星）是极其重要的。原子电子降低核库仑势的这种效应已在许多实验室实验中得到证实。不幸的是，实验屏蔽能量比理论预测高得多，其原因仍然未知。本文介绍了超高真空条件下研究不同氘化金属靶中d + d核反应的实验结果。用电子回旋离子源提供的能量为8 ~ 30 keV的氘束测量了~ 2 H（d，p）~ 3 H和~ 2 H（d，n）~ 3 He反应的总截面和角分布。结合靶的Ar溅射和俄歇电子能谱，保证了靶表面的原子清洁度。由于在线分析方法的应用，注入的氘核密度的均匀性可以连续监测。我们将讨论理论和实验数据之间的巨大差异的可能原因。
The enhanced electron screening effect in nuclear reactions taking place in dense astrophysical plasmas is extremely important for determination of stellar reaction rates in terrestrial laboratories as well as in prediction of cross sections enhancement in interiors of stars such as White and Brown Dwarfs or Giant Planets. This effect resulting in reduction of the nuclear Coulomb potential by the atomic electrons has been confirmed in many laboratory experiments. Unfortunately, experimental screening energies are much higher than the theoretical predictions and the reason for that remains unknown. Here, we present absorbing results of the experiment studying d + d nuclear reactions in different deuterized metallic targets under ultra high vacuum conditions. The total cross sections and angular distributions of the 2H(d,p)3H and 2H(d,n)3He reactions have been measured using a deuteron beam of energies between 8 and 30 keV provided by the electron cyclotron ion source. The atomic cleanness of the target surface has been secured by combining Ar sputtering of the target and Auger electrons spectroscopy. Due to application of an on-line analysis method, the homogeneity of the implanted deuteron densities could be continuously monitored. We will discuss probable causes of the large discrepancy between theoretical and experimental data.