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19 April 2024

» arxiv » 1311.1456

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Neutron-skin thickness of 208Pb, and symmetry-energy constraints from the study of the anti-analog giant dipole resonance
A. Krasznahorkay ; M. Csatlós ; L. Csige ; T.K. Eriksen ; F. Giacoppo ; A. Görgen ; T.W. Hagen ; M.N. Harakeh ; R. Julin ; P. Koehler ; N. Paar ; S. Siem ; L. Stuhl ; T. Tornyi ; D. Vretenar ;
Date:	6 Nov 2013
Abstract:	The 208Pb(p,ngamma p)207Pb reaction at a beam energy of 30 MeV has been used to excite the anti-analog of the giant dipole resonance (AGDR) and to measure its gamma-decay of to the isobaric analog state. The energy of the transition has also been calculated with the self-consistent relativistic random-phase approximation (RRPA), and found to be linearly correlated to the predicted value of the neutron-skin thickness (DR_pn). By comparing the theoretical results with the measured transition energy, the value of 0.190 +- 0.028 fm has been determined for DR_pn of 208Pb, in agreement with previous experimental results. The AGDR excitation energy has also been used to calculate the symmetry energy at saturation (J=32.7+- 0.6 MeV) and the slope of the symmetry energy (L=49.7 +- 4.4 MeV), resulting in more stringent constraints than most of the previous studies.
Source:	arXiv, 1311.1456
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