Abstract
We investigate the electromagnetic transition probabilities for the helium atom embedded in a superstrong magnetic field taking into account the finite nuclear mass. We address the regime $\ensuremath{\gamma}=100--10000\mathrm{a}.\mathrm{u}.$ studying several excited states for each symmetry, i.e., for the magnetic quantum numbers $0,\ensuremath{-}1,\ensuremath{-}2,\ensuremath{-}3,$ positive and negative z parity, and singlet and triplet symmetry. The oscillator strengths as a function of the magnetic field and, in particular, the influence of the finite nuclear mass on the oscillator strengths are shown and analyzed.
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