QED nuclear recoil effect in helium isotope shift
Abstract
We present a detailed investigation of the leading-order mα5 QED correction with inclusion of the finite-nuclear-mass effects. Previously, this correction had been calculated within an expansion in the electron-nucleus mass ratio m/M up to the first order. In this work, we derive formulas for the mα5 QED contribution that are valid up to the second order in m/M, and perform its calculation for the 3He-4He isotope shift, leading to an improved determination of the nuclear charge-radius difference.
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