Radiative Correction to the Nuclear-Size Effect and Hydrogen-Deuterium Isotopic Shift

Abstract

The radiative correction to the nuclear charge radius contribution to the Lamb shift of order $\alpha (Z\alpha {)}^5{m}_r^3<r^2>$ is calculated. In view of the recent high precision experimental data, this theoretical correction produces a significant contribution to the hydrogen-deuterium isotopic shift.

Comments: 5 pages, REVTEX, replaced with the final version, to be published in Phys.Rev. A, two references added