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Investigating the Metastable State of Li-like Ions 1s2s2p 4Po5/2: Magnetic Interactions and Decay Properties

This study explores the decay properties of the metastable state 1s2s2p 4Po5/2 in Li-like ions, serving as a benchmark for magnetic interactions. We compare the Breit-Pauli approximation with Dirac-based models, utilizing advanced computational codes such as SUPERSTRUCTURE, AUTOSTRUCTURE, and GRASP. We investigate decay rates across various elements (Z=3 to 92), accounting for mechanisms like Auger decay and magnetic interactions. Significant discrepancies in calculations highlight the limits of the Breit-Pauli approximation, particularly for high atomic number Z values, revealing the need for enhanced theoretical frameworks.

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Investigating the Metastable State of Li-like Ions 1s2s2p 4Po5/2: Magnetic Interactions and Decay Properties

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  1. On the 1s2s2p 4Po5/2 metastable state in the Li-like ions P. Palmeri, P. Quinet, C. Mendoza, M. Godefroid, N. Vaeck and P. Indelicato

  2. Outlook • Introduction • Models used • Results • Conclusion

  3. Introduction Decay properties of 1s2s2p 4Po5/2 is a workbench for magnetic interactions  Good case for comparing the Breit-Pauli approximation with models based on the Dirac equation !

  4. Decay scheme

  5. Codes used • Breit-Pauli approximation: SUPERSTRUCTURE (M1 & M2) AUTOSTRUCTURE (Auger & M1) • Dirac equation: GRASP (M1 & M2) MDF-GME (M1, M2 & Auger)

  6. SUPER/AUTOSTRUCTURE • Schrodinger equation using a scaled TFD potential, V(r). • Magnetic interactions (1 & 2-body): spin-orbit, spin-other-orbit, spin-spin, spin-contact, orbit-orbit. • CI: single and double-excitations up to n=3 • Orthogonal orbitals • DW approximation for the Auger • Z=3,4,6,7,8,9,10,12,13,14,16,18,20,22,23,25,26, 30,36,54,67,80,92

  7. GRASP • Multiconfiguration Dirac-Fock method • Breit interaction + QED corrections • CI: S&D-excitations up to n=3 • Orthogonal orbitals • Z=4,6,7,8,9,10,12,13,14,16,18,20,22,23,25,26,30,36,54,67,80,92

  8. MDF-GME • MCDF method • Breit interaction + QED corrections • CI: S&D-excitations up to n=4 (M1&M2); up to n=5 (Auger) • Non-orthogonal orbitals • DW approximation • Z=16,18,26

  9. Decay rates along the sequence

  10. Lifetime: comparison with experiment

  11. Auger rate: comparison with other models

  12. M2 rate : comparison with other models

  13. M1 rate: comparison with other models

  14. Relativistic correction to the M1 transition operator

  15. Conclusion Breakdown of the B-P approximation (discord with Dirac theory > 20%): M1 for Z > 36 (Kr) M2 for Z > 54 (Xe) Auger for Z > 80 (Pb)

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