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
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.