碳对α的非卢瑟福背散射截面研究

THE STUDY OF NON-RUTHERFORD BACKSCATTERING OF ￣4He FROM CARBON

报道了散射角为１７０°±１．５°，α粒子能量在５－９．０ＭｅＶ之间，ｃ的背散射截面的实验测量值；用Ｒ矩阵理论，通过与实验数据拟合，分析、给出了一套能级参数，并计算了能量范围在２－９．０ＭｅＶ，ｃ的背散射截面；讨论了对背散射分析感兴趣的窄而孤立的强共振峰４２５０±１０ＫｅＶ随靶厚、角度的变化关系以及截面变化缓慢的平坦区３．６－４．２０ＭｅＶ，６．４２５－６．７００ＭｅＶ能区的截面值与背散射角度的关系。

The 170.0°±1.5°backscattering cross sections of ￣4He from C were measured inthe energy range of 5.0-9.0MeV,The R-matrix was used to analyze the scatteringcross sections,thus energy level parameters of the compound nucleus ￣(16)O,for alphaenergies from 3.224MeV to 10.544MeV,were identified.These level parameters canbe used to calculate the cross sections at certain angles according to the real expe-rimental conditions The behaviour of a narrow strong resonance at 4.250MeV wasinspected at different energy smear and scattering angles of 165°and 170°. In thetwo energy regions:3.600-4.200MeV and 6.425-6.700MeV,the cross sections exhi-bit a smoothly in creasing variation The measured and calculated cross sectionsshow that in the energy range of 3.60-4.20MeV region,the cross sections are notsignificantly influenced by the scattering angle,but in the energy range of 6.425-6.700MeV region,the cross sections are strongly angle-dependent.