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ISSN - 01422413, Surveys in High Energy Physics, 1999, vol. 14, p. 175-184

Nature of the Darwin term and (Zα) 4m 3/M 2 contribution to the Lamb shift for an arbitrary spin of the nucleus

Khriplovich I. B., Milstein A. I., Sen'kov R. A.

The contact Darwin term is demonstrated to be of the same origin as the spin-orbit interaction. The (Zα) 4m 3/M 2 correction to the Lamb shift, generated by the Darwin term, is found for an arbitrary nonvanishing spin of the nucleus, both half-integer and integer. There is also a contribution of the same structure as that of nuclear quadrupole moment.