Low-energy elastic positron cross sections for H2 and N2 using an ab initio target polarization

摘要

Using an ab initio model to account the polarization effects of molecules in the presence of slow positrons,nwe have obtained low-energy positron cross sections for H2 and N2 molecules. The polarization model proposednhere is calculated with the expected values of the positron-electron interaction operator in the polarized targetnwave function for each fixed distance of the positron. Together with the electrostatic potential, this polarizationndescribes the interaction potential in a static-polarization approximation. Within this interaction level, we havenobtained differential and integral cross sections that are in good agreement with recent measurements of thenTrento group and other theoretical approaches.