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Hyperfine induced $1s2s ^1S_0 \to 1s^2 ^1S_0$ M1 transition probabilities ofHe-like ions have been calculated from relativistic configuration interactionwavefunctions including the frequency independent Breit interaction and QEDeffects. Present results for {$^{151}$}Eu and {$^{155}$}Gd are in goodagreement with previous calculations [Phys. Rev. A {\bf 63}, 054105 (2001)].Electronic data are given in terms of a general scaling law in $Z$ that, givenisotopic nuclear spin and magnetic moment, allows hyperfine induced decay ratesto be estimated for any isotope. The results should be helpful for futureexperimental investigations on QED and parity non-conservation effects.

the european physical journal. d, atomic, molecular and optical physics/the european physical journal. d, atomic, molecular, optical and plasma physics

Hyperfine induced $1s2s ^1S_0 \to 1s^2 ^1S_0$ M1 transition of He-like ions