| Calculation of Total Cross Sections for Positron Scattering by Lithium at Intermediate Energies |
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| 作者姓名： | 吴勇 周雅君 |
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| 作者单位： | InstituteofAtomicandMolecularPhysics,JilinUniversity,Changchun130012 |
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| 摘 要： | The total cross sections for positron scattering by lithium at intermediate energies (10-200eV) are calculated by using the coupled-channel optical method with a complex equivalent-local polarization potential which incorporates ionization continuum and positronium (Ps) formation channels contributions into the coupled channels framework. The effects of the two-body Ps rearrangement and three-body ionization process on the total crosss ection are found to be significant at lower energies and this effect is not negligible up to 30 eV. Compared to the available theoretical data, the predicted total cross sections agree quite well with the calculations of McAlinden et al. [J. Phys. B: At. Mol. Opt. Phys. 30 (1997)1543] and Campbell et al. [Nucl. Instrum. Methods Phys. B 143 (199s) 41]
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| 关 键 词： | 正电子散射 锂 介质能量 横截面计算 碱系原子 |
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