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Neutron-skin thickness of 208Pb, and symmetry-energy constraints from the study of the anti-analog giant dipole resonance

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.
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http://hal.in2p3.fr/in2p3-00880890
Contributor : Michel Lion <>
Submitted on : Thursday, November 7, 2013 - 9:13:05 AM
Last modification on : Thursday, February 1, 2018 - 1:34:11 AM

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  • HAL Id : in2p3-00880890, version 1
  • ARXIV : 1311.1456

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A. Krasznahorkay, M. Csatlós, L. Csige, T. K. Eriksen, F. Giacoppo, et al.. Neutron-skin thickness of 208Pb, and symmetry-energy constraints from the study of the anti-analog giant dipole resonance. 2013. ⟨in2p3-00880890⟩

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