Accurate calculation of self-energy screening diagrams for high Z helium-like atoms

• Published in: Physics letters. A 1995-11, Vol.207 (5), p.274-280
• Main Authors: Yerokhin, V.A., Shabaev, V.M.
• Format: Article
• Language: English
• Subjects: Accurate calculation of self-energy screening diagrams
• ISSN: 0375-9601; 1873-2429
• DOI: 10.1016/0375-9601(95)00692-V

An accurate calculation of the self-energy screening diagrams for the ground state of high Z helium-like atoms is carried out. The total self-energy screening contribution is represented by the sum of the irreducible, reducible and vertex parts. The irreducible contribution is calculated using the partial wave mass renormalization procedure. The reducible and vertex contributions are grouped to be calculated without renormalization. It is found that the total self-energy screening contribution to the ground state energy of U 90+ constitutes −9.2 eV. The theoretical value of the ground state energy of 238U 90+ without higher order one-electron QED corrections is evaluated to be −261384(2) eV.