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

Université de Mons-Hainaut

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Outlook

• Introduction

• Models used

• Results

• Conclusion

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 !

Decay scheme

Codes used

• Breit-Pauli approximation: SUPERSTRUCTURE (M1 & M2) AUTOSTRUCTURE (Auger & M1)

• Dirac equation:

GRASP (M1 & M2)

MDF-GME (M1, M2 & Auger)

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

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

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

Decay rates along the sequence

Lifetime: comparison with experiment

Auger rate: comparison with other models

M2 rate : comparison with other models

M1 rate: comparison with other models

Relativistic correction to the M1 transition operator

Ion SS*

A (s-1)

SS

A (s-1)

GRASP

A (s-1)

MDF

A (s-1)

S XIV 6.37E-1 1.33E+6 1.34E+6 2.10E+6

Ar XVI 1.52 4.46E+6 4.54E+6 6.26E+6

Fe XXIV 6.22E+2 1.94E+8 2.00E+8 2.22E+8

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)