Neutron-skin thickness of 208Pb, and symmetry-energy constraints from the study of the anti-analog giant dipole resonance - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Preprints, Working Papers, ... Year : 2013

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
  • Function : Author
T. K. Eriksen
  • Function : Author
F. Giacoppo
  • Function : Author
A. Görgen
  • Function : Author
T. W. Hagen
  • Function : Author
R. Julin
  • Function : Author
P. Koehler
  • Function : Author
N. Paar
  • Function : Author
S. Siem
  • Function : Author
L. Stuhl
  • Function : Author
T. Tornyi
  • Function : Author
D. Vretenar
  • Function : Author

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.

Dates and versions

in2p3-00880890 , version 1 (07-11-2013)

Identifiers

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

Cite

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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