-dependent hyperfine induced transition rates in an external magnetic field for Be-like 47Ti18+

Abstract

Hyperfine induced 2s2p 3 P 0 → 2s 2 1 S 0 transition rates in an external magnetic field for Be-like 47 Ti were calculated based on the multiconfiguration Dirac-Fock method. It was found that the transition probability is dependent on the magnetic quantum number M F of the excited state, even in the weak field. The present investigation clarified that the difference of the hyperfine induced transition rate of Be-like Ti ions between experiment [Schippers et al., Phys Rev Lett 98, (2007) 033001(4)] and theory does not result from the influence of external magnetic field.

Magnetic-field- and hyperfine-induced P03−S01 transitions in Be- and Ne-like ions

“…This illustrates the difference between our present calculations and the earlier results from [37], shown in the last column, which only included the diagonal F = 0 perturbers. It is clear that the contribution from F = ±1 perturbers is significant for the MIT-hfs probabilities.…”

“…Since there are magnetic fields associated with storage rings, Li et al [37] investigated the contribution of the magnetic fields to the HIT rate for Be-like Ti and concluded that these effects were too weak at the experimental magnetic flux density of 0.75 T. However, in their calculation they neglected the mixing from the F = 0 perturbers, which could be important for higher field strengths. A first more systematic and complete investigation of what we will label MIT-hfs, the simultaneous inclusion of HIT and MIT to compute transition rates, for isotopes with nuclear spin, is the aim of this work.…”

“…The A MIT-hfs (s −1 ) were obtained by the inclusion of only the perturbers with F = 0 and of perturbers with F = 0,±1. The results from [37] are shown in the last column. All transition rates are given in s A MIT-hfs would be important for comparison with the quite extensive calculations now available.…”

Effect of an external magnetic field on the determination of E1M1 two-photon decay rates in Be-like ions

“…Magnetic quenching in the TSR has been investigated theoretically by Li et al [20] for the 2s 2p 3 P 0 level in Be-like 47 Ti 18+ . The effect has been found to be insignificant for this specific case.…”

Storage-ring measurements of hyperfine induced transition rates in berylliumlike ions

“…In addition, the HFI transition rates acquire a dependence on the magnetic quantum number m F of the excited level. Li et al [28] concluded that these effects are too weak at the experimental magnetic flux density of 0.75 T to explain the discrepancy between experimental and theoretical HFI transition rates.…”