Anti-Analog Giant Dipole Resonance and the Neutron Skin in 208Pb
Abstract
The anti-analog giant dipole resonance (AGDR) was separated from other excitations such as the spin-dipole resonance by multipole decomposition analysis of the 208Pb(p,n) reaction at a bombarding energy of Tp = 296 MeV. Theexcitation energy of the AGDR relative to the isobaric analog state (IAS) was determined to be ΔE = 8.69 ± 0.36 MeV, where the uncertainty includes both statistical and systematic contributions. Theoretical calculations using the proton-neutron relativistic quasi-particle random phase approximation predicted a strong correlation between ΔE and the neutron skin thickness ΔRpn The present ΔE value corresponds to a neutron skin thickness of ΔRpn = 0.216 ±0.046 ± 0.015 fm, where the first and second uncertainties are the experimental and theoretical uncertainties, respectively.
- Publication:
-
JPS Conference Proceedings
- Pub Date:
- 2014
- DOI:
- 10.7566/JPSCP.1.013036
- Bibcode:
- 2014JPSCP...1a3036Y