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完成了19F+27Al深部非弹性碰撞产物的角分布测量.初步分析了反应产B,C,N,O,F,Ne,Na,Mg和Al的实验室系角分布,展现出深部非弹性反应机制的特点,显示了反应系统随时间的演化过程. Angular distributions of fragments produced in the deep inelastic collision of~(19)F+~(27)Al have been measured for incident energy of 114 MeV at θ_(lab)= 9~(o), 24~(o), 40~(o), 55~(o), 70~(o) and 85~(o). Angular distributions of dissipative products B, C, N, O, F, Ne, Na, Mg and Al are analyzed to provide an evolution process of the intermediate dinuclear system formed in the reaction. 相似文献
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在中国原子能科学研究院 HI- 1 3串列加速器上建立了用 Q3D磁谱仪动量分析和ΔE- E粒子分辨对材料表面进行高分辨的弹性反冲探测分析技术 .用 1 0 0 Me V12 7I对 C/Li F多层样品的深度分布分析表明 ,表面分辨达到 1 .2 nm.所建立的ΔE(气体 ) - E(半导体 )望远镜探测器可同时分析从轻至中重的所有元素 .实测了新光电材料 Ga N,La2 Sr Cu O4 超导膜和新超硬材料 C3N4 (Si)等样品. High resolution depth profiling technique with elastic recoil detection analysis has been developed at the HI 13 tandem accelerator of CIAE. A depth resolution of 1.2 nm was achieved at the surface of the samples with the Q3D magnetic spectrometer and the focal plane detector. From light to medium heavy elements were simultaneous analyzed with a small Δ E E telescope. The method was applied to depth profile analysis of C/LiF multilayers, La 2SrCuO 4 superconductor and GaN foil samples. 相似文献
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Angular distributions of fragments B, C, N, O, F, Ne, Na, Mg and Al induced by the collision of ^19F ^27Al at 114 MeV have been measured. Angular dispersion parameters are extracted from the experimental data and compared with the theoretical ones. The dynamic dispersions for dissipative products depend strongly on the charge number Z of the fragments. 相似文献
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介绍在中国原子能科学研究院HI-13串列加速器上,对α-Si1-xCx:H薄膜样品进行弹性反冲探测分析的方法和结果.用该加速器提供的高品质^127Ⅰ束流轰击α-Si1-xCx:H薄膜材料样品,用△E(gas)一E(PSD)望远镜探测器,在前角区(30。角)测量从该样品中反冲的各元素的能谱.然后用离子束分析(IBA)程序SIMNRA对能谱进行拟合,得到样品中H,C和Si的比分及深度分布.Elastic recoil detection analysis of α-Si_(1-x)C_(x)∶H foils has been performed at the HI-13 tandem accelerator of CIAE. High quality~(127)I beam bombards the target of α -Si_(1-x)C_(x)∶H_( ) thin film. A ΔE(gas)-(E(PSD)) telescope was used to measure the energy spectra of all elements recoiled from the samples at the angle of 30° in laboratory system. Components of H, C and Si and the profiles were obtained by simulation of the energy spectra using the program SIMNRA calculation. 相似文献
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完成了19F+93Nb耗散反应产物激发函数的两次独立测量,入射束流的能量从102MeV到108MeV,步长250keV.实验结果在一些相同能量点两次测量的截面不能重复.分析表明:能量自关联函数的离散程度大约相当于随机计数率引起的离散程度的3倍;激发函数曲线相对于能量平均本底的几率分布,有大约21髎超出了标准高斯分布宽度的3倍;两次测量得到的截面之差的几率分布大约有18髎也超出了标准高斯分布宽度的3倍.可见,两次测量的19F+93Nb耗散反应产物激发函数的截面不重复性具有明确的统计意义,其来源不是计数率的随机涨落. 相似文献
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Choosing ^7 Li and ^12C heavy ions respectively with different linear energy transfer (LET) values, purified plasmid DNA samples in aqueous solution are irradiated with various doses. The atomic force microscopy (AFM) is used for analysis of DNA fragments induced by both the kinds of heavy ions. There is a change of three forms of DNA, i.e. supercoiled, open circular and linear form, as the dose is observed. The distribution function of DNA fragment length is obtained for the first time and fitted with the Tsallis entropy statistical theory. The result indicates that AFM is a useful tool for analysis of the short fragment of DNA, high-LET heavy ion radiation induces DNA double strand breaks (DSBs) more effectively, and the distributions of the DSBs are more local and dense in comparison with low-LET radiation. 相似文献