Ionization of atoms by positron impact: Applcations of the Scaled Born Method
DOI:
https://doi.org/10.31349/RevMexFis.72.060401Keywords:
Born, positron, ionization, atomsAbstract
Positron emission tomography (PET) scans can be used to investigate the pathogenesis of neurological disorders and diseases such as Alzheimer’s and Parkinson’s. PET scans use positrons to resolve an image of the internal biochemical process occurring inside the body, i.e., ionization cross sections. Knowledge of ionization cross sections for atoms is evidently crucial in PET technology. We will discuss some recent developments of the scaled Born positron (SBP) method for ionization of atoms. The SBP method was originally proposed for electronic excitations of atoms (J.L.S. Lino, Chin.J .Phys.54 (2016)504). First Born approximation (FBA) and the atomic orbital wavefunctions have been approximated by Roothaan-Hartree-Fock, and the scattered positron and ejected electron have been approximated by a plane wave and Coulomb wave as proposed by Barlett etal. (Atomic Data Tables 86 (2004) 235). It is shown that the SBP method combined with an analytical factor results in a efficient method when compared with the sophisticated and traditional binary-encounter-dipole (BED) model. Results of ionization cross sections of H, He, Ne, and C atoms using the new representation are presented to illustrate the applicability of the improved SBP method.
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