On the 1s2s2p 4Po52 metastable state in the Lilike ions

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

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Outlook

• Introduction
• Models used
• Results
• Conclusion

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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 !

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Decay scheme
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Codes used

• Breit-Pauli approximation SUPERSTRUCTURE (M1
  M2) AUTOSTRUCTURE (Auger M1)
• Dirac equation
• GRASP (M1 M2)
• MDF-GME (M1, M2 Auger)

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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 n3
• Orthogonal orbitals
• DW approximation for the Auger
• Z3,4,6,7,8,9,10,12,13,14,16,18,20,22,23,25,26,
• 30,36,54,67,80,92

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GRASP

• Multiconfiguration Dirac-Fock method
• Breit interaction QED corrections
• CI SD-excitations up to n3
• Orthogonal orbitals
• Z4,6,7,8,9,10,12,13,14,16,18,20,22,23,25,26,30,36
  ,54,67,80,92

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MDF-GME

• MCDF method
• Breit interaction QED corrections
• CI SD-excitations up to n4 (M1M2)
• up to n5 (Auger)
• Non-orthogonal orbitals
• DW approximation
• Z16,18,26

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Decay rates along the sequence
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Lifetime comparison with experiment
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Auger rate comparison with other models
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M2 rate comparison with other models
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M1 rate comparison with other models
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Relativistic correction to the M1 transition
operator
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Conclusion

• Breakdown of the B-P approximation (discord with
  Dirac theory gt 20)
• M1 for Z gt 36 (Kr)
• M2 for Z gt 54 (Xe)
• Auger for Z gt 80 (Pb)