打靶谱测量中的表面效应  

Surface effect in measurement of bombarding spectra

作　　者：王大伦[1] 秦建国[1] 赖财锋[1] 韩子杰[1] 

机构地区：[1]中国工程物理研究院核物理与化学研究所,四川绵阳621900

出　　处：《强激光与粒子束》2010年第11期2745-2748,共4页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(10145005)

摘　　要：通过电子、X射线混合源和X射线源打源照镁靶谱的对比实验,论证了放射源打靶谱的测量中存在着表面效应。它除和电子打靶有关外,也反映了靶表面的一些特性。为此,做了放电源打源照镁靶谱随存放时间变化的实验。实验结果表明:源照镁靶表面可能存在一层阻挡层,阻止新态氢原子向外扩散。根据打磨和未打磨源照镁靶打靶谱的对比实验,推测靶表面的阻挡层可能是一层新态氢原子富集层。为此,又做了镁铼靶打靶谱的对比实验,照射打磨和未打磨镁靶打靶谱的对比实验,根据实验结果,估计新态氢原子富集层可能是一层以氧为核的氢原子和新态氢原子团。由此推测阻挡层是一层以氧为核的新态氢原子团组成的新态氢原子富集层。这种新态氢原子富集层产生了打靶谱测量中的表面效应。The surface effect in the spectrum measurement of radioactive sources bombarding targets was studied.The existence of surface effect was validated by comparative experiments of Mg bombarded-targets using mixed electron and X-ray source and X-ray source.And the effect not only has a relationship to the electrons but also shows some characteristics of the target surface.It is inferred that there is a stopping layer on the Mg bombarded-target surface through the experiment about the variation of spectra with target storage time,and the stopping layer can stop new-state hydrogen atoms diffusing from the target surface.The spectra of radioactive sources bombarding Re target and burnished and unburnished Mg targets indicate that,the stopping layer may be a new-state hydrogen atom enrichment layer,consisting of radicals constituted by hydrogen atoms and new-state hydrogen atoms around the oxygen core.And the surface effect in the experiments is brought by the new-state hydrogen atom enrichment layer.

关 键 词：表面效应 阻挡层 新态氢原子富集层 打靶谱 

分 类 号：O461.1[理学—电子物理学]