Nuclear polarization in hydrogenlike $^{208}_{~82}$Pb$^{81+}$

Details Nuclear polarization in hydrogenlike $^{208}_{~82}$Pb$^{81+}$ Nuclear polarization in hydrogenlike $^{208}_{~82}$Pb$^{81+}$

2001-10-05

arxiv.org/abs/nucl-th/0110012v1

Physics

Nuclear Physics

Nuclear Theory

26 pages, 5 figures

Scientific paper

10.1103/PhysRevA.65.052509

We calculate nuclear-polarization energy shifts for hydrogenlike $^{208}_{~82}$Pb$^{81+}$. A retarded transverse part as well as the Coulomb part is taken into account as the electromagnetic interaction between an electron and the nucleus. With a finite charge distribution for the nuclear ground state and the random-phase approximation to describe the nuclear excitations, we obtain nuclear polarization energy of the $1s_{1/2}$ state as --38.2 (--37.0) meV in the Feynman (Coulomb) gauge. For the $2s_{1/2}$, $2p_{1/2}$ and $2p_{3/2}$ states, they are --6.7 (--6.4), --0.2 (--0.2) and +0.0 (+0.0) meV, respectively. The seagull term in the two-photon exchange diagrams is shown to be quite important to obtain the gauge invariance of the nuclear polarization energies.

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