This work reports elastic integral and differential cross sections for positron collisions with pyrimidine, for energies up to 20 eV. The cross sections were computed with the Schwinger multichannel method in the static plus polarization approximation. We also employed the Born closure procedure to account for the long range potential due to the permanent dipole moment of the molecule. Our results are compared with the experimental total cross section of Zecca et al. [J. Phys. B 43, 215204 (2010)], the experimental grand-total, quasi-elastic integral and differential cross section of Palihawadana et al. [Phys. Rev. A 88, 12717 (2013)]. We also compare our results with theoretical integral and differential cross sections obtained by Sanz et al. [Phys. Rev. A 88, 62704 (2013)] with the R-matrix and the independent atom model with screening-corrected additivity rule methods, and with the results computed by Franz and Gianturco [Phys. Rev. A 88, 042711 (2013)] using model correlation-polarization potentials. The agreement between the theory and the experiment is encouraging. (C) 2015 AIP Publishing LLC.
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机译：这项工作报道了正电子与嘧啶碰撞的弹性积分和微分截面，能量高达20 eV。横截面是通过Schwinger多通道方法在静态加极化近似中计算的。由于分子的永久偶极矩，我们还采用了Born闭合程序来说明远距离电势。我们的结果与Zecca等人的实验总横截面进行了比较。 [J.物理B 43，215204（2010）]，Palihawadana等人的实验大总，准弹性积分和微分截面。 [物理修订版A 88，12717（2013）]。我们还将我们的结果与Sanz等人获得的理论积分和微分截面进行比较。 [物理Rev. A 88，62704（2013）]，其中包含R-矩阵和具有筛选校正后的加和性规则方法的独立原子模型，并由Franz和Gianturco计算了结果。 Rev. A 88，042711（2013）]，使用模型相关极化电位。理论与实验之间的共识令人鼓舞。 （C）2015 AIP Publishing LLC。
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