Neutron-skin thickness of Pb-208 from the energy of the anti-analogue giant dipole resonance

Krasznahorkay, Attila and Paar, N. and Vretenar, D. and Harakeh, M. N. (2013) Neutron-skin thickness of Pb-208 from the energy of the anti-analogue giant dipole resonance. PHYSICA SCRIPTA, T154 (1). ISSN 0031-8949

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Abstract

The energy of the charge-exchange Anti-analog Giant Dipole Res- onance (AGDR) has been calculated for the 208Pb isotope using the state-of-the-art fully self-consistent relativistic proton-neutron quasi- particle random-phase approximation based on the Relativistic Hartree- Bogoliubov model. It is shown that the AGDR centroid energy is very sensitively related to the corresponding neutron-skin thickness. The neutron-skin thickness of 208Pb has been determined very precisely by comparing the theoretical results with the available experimental data on E(AGDR). The result ∆Rpn = 0.161 ± 0.042 agrees nicely with the previous experimental results.

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