摘要
在低能 ( 60～ 360keV)质子注入氘化钛 (Ti2 Hx)、钛 (Ti)、钼底衬钛箔及钼 (Mo)和不锈钢 (SS)等金属样品的实验中 ,观测到了能量分别约为 3 9、5 6和 8 4MeV的带电粒子产物。用符合望远镜和吸收片法进行粒子鉴别的结果表明 :这些带电粒子均具有α粒子特性。 3种α粒子来自质子与不同靶核发生的垒下核反应。其中 ,能量为 3 9MeV的α粒子具有很高的产额 ,其对应核反应的准激发函数曲线在 150～ 330keV能区内 ,随入射质子能量增大呈指数增长趋势。上述反应产物可能源于11N( p ,α) 12 C ,11B( p ,α) 8Be和7Li( p ,α) 4 He等核反应。但相关靶核的来源仍有待解释。
Nuclear interactions in the proton implantation in the energy region between 60 keV and 360 keV are studied. Some low energy nuclear reaction products are observed in the implantation experiments on titanium, titanium alloy, titanium and molybdenum composition, molybdenum and stainless steel metal samples. The energies of the charged particle products are about 3.9, 5.6 and 8.4 MeV, respectively. These particles are identified as alpha particles with both coincident telescope and absorption methods. These three kinds of alpha particles with both coincident telescope and absorption methods. These three kinds of alpha products are from different proton sub-barrier reactions. The maximum reaction rate of the reaction with 3.9 MeV alpha product have reached over 105/s, while the 324 keV and 1.2 mA proton beam is implanted into a Ti2Hx target. The exciting curve of this reaction increases exponentially with the growth of proton energy in the energy region from 150 keV to 330 keV. 11N (p, α)12C, 11B (p, α)8Be and 7Li(p, α)4He nuclear reactions are considered as the candidate reactions for the alpha products in the implantation experiments. A series of studies on the nuclear reactions and its effects in sample surface and crystal structure have been studied with electron microscope technology.
出处
《原子能科学技术》
EI
CAS
CSCD
2001年第3期200-206,共7页
Atomic Energy Science and Technology
基金
国家自然科学基金资助项目! (19845 0 0 2 )
中国科学院院长特殊支持项目
