CROSS-SECTIONS FOR NON-RUTHERFORD BACKSCATTERING OF HE-4 FROM 5 LIGHT-ELEMENTS
CROSS-SECTIONS FOR NON-RUTHERFORD BACKSCATTERING OF HE-4 FROM 5 LIGHT-ELEMENTS
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DOI：
10.1016/0168-583x(94)95783-5
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发表时间：
1994-03-01
影响因子：
1.3
通讯作者：
TANG, JY
中科院分区：
文献类型：
--
作者：
CHENG, HS;SHEN, H;TANG, JY
我们报告了 He-4 从 Al 和 Si 反向散射的横截面测量结果，散射角为 170 +/- 1.5 度（实验室），He-4 实验室能量在 2.0 到 9.0 MeV 之间；以及 He-4 从 F、Mg 和 Cl 反向散射的横截面，散射角为 165 +/- 1.5 度（实验室），He-4 实验室能量分别在 1.6 和 5.0 MeV、2.0 和 8.4 MeV 以及 2.0 和 8.7 MeV 之间。 实验结果表明，对于F、Mg、Al、Si和Cl，卢瑟福散射公式仍能预测背向散射截面的高能分别为2.60、3.20、3.60、3.80和4.50 MeV。 当能量高于上限值时，后向散射截面显示F、Al和Cl的连续核共振分布。 对于硅，在 4.370 MeV (+/- 10 keV) 处发现强窄隔离共振。 4.370 MeV 处的截面为卢瑟福的 2.90 倍，共振宽度 GAMMA(lambda) 为 20 keV。 更强的孤立窄共振位于 5.375 MeV (+/- 10 keV)。 截面为 5.375 MeV 处卢瑟福的 9.50 倍，与 GAMMA(lambda) 的共振为 10 keV。 这两个共振可用于反向散射分析。
We report the results of measured cross sections for backscattering of He-4 from Al and Si at a scattering angle of 170 +/- 1.5-degrees (lab) for He-4 laboratory energies between 2.0 and 9.0 MeV; and the cross sections for backscattering of He-4 from F, Mg and Cl at a scattering angle of 165 +/- 1.5-degrees (lab) for He-4 laboratory energies between 1.6 and 5.0 MeV, 2.0 and 8.4 MeV and 2.0 and 8.7 MeV, respectively. Experimental results show that, for F, Mg, Al, Si and Cl, the upper energies at which the backscattering cross section can still be predicted by the Rutherford scattering formula, are 2.60, 3.20, 3.60, 3.80 and 4.50 MeV, respectively. When the energy is higher than the upper value, the backscattering cross section shows a continuous nuclear resonance distribution for F, Al and Cl. For silicon, a strong narrow isolated resonance is found at 4.370 MeV (+/- 10 keV). The cross section is 2.90 times Rutherford at 4.370 MeV and the resonance width GAMMA(lambda) is 20 keV. A much stronger isolated narrow resonance is at 5.375 MeV (+/- 10 keV). The cross section is 9.50 times Rutherford at 5.375 MeV and the resonance with GAMMA(lambda) is 10 keV. These two resonances may be used for backscattering analysis.