评“皮秒laser等离子体中无中子聚变反应的观测”
Comment on "Observation of neutronless fusion reactions in picosecond laser plasmas"
摘要：
Belyaev等人的论文[Phys. Rev. E { \bf 72}，026406（2005）]报道了在热核反应$^{11}$ B（$p,α$）中产生的α粒子的第一次实验观察，该反应通过激光照射在$^{11}$ B聚乙烯（CH $_2$）复合靶上诱导。实验中使用的激光器的特征在于皮秒脉冲持续时间和2 $\times10^{18}$ W/cm $^2$的强度峰值。我们认为，在他们的检测系统中采用的背景降低方法和反应产物的检测能量区域的选择可能是不够的。因此，报告的总产量低估了真实产量。根据他们的观察，我们估计总产量高于他们的结论，即，每次注射约10个$^5 α$。
英文摘要：
The paper by Belyaev et al. [Phys. Rev. E {\bf 72}, 026406 (2005)] reported the first experimental observation of alpha particles produced in the thermonuclear reaction $^{11}$B($p,α$)$^{8}$Be induced by laser-irradiation on a $^{11}$B polyethylene (CH$_2$) composite target. The laser used in the experiment is characterized by a picosecond pulse duration and a peak of intensity of 2$\times10^{18}$ W/cm$^2$. We suggest that both the background-reduction method adopted in their detection system and the choice of the detection energy region of the reaction products are possibly inadequate. Consequently the total yield reported underestimates the true yield. Based on their observation, we give an estimation of the total yield to be higher than their conclusion, i.e., of the order of 10$^5 α$ per shot.
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