Abstract
A high-resolution measurement of inelastic proton scattering off near 0° was performed at 295 MeV with a focus on a pronounced strength previously reported in the low-energy tail of giant dipole resonance. A forest of fine structure was observed in the excitation energy region 7–12 MeV. A multipole decomposition analysis of the angular distribution for the forest was carried out using the ECIS95 distorted-wave Born approximation code with the Hartree-Fock plus random-phase approximation model of and transition densities and inclusion of Coulomb excitation. The analysis separated pygmy dipole and resonances in the forest at with and at with in the Lorentzian function, respectively. The value for pygmy dipole resonance over 7–11 MeV is , which corresponds to of the Thomas-Reiche-Kuhn sum rule.
- Received 28 April 2012
DOI:https://doi.org/10.1103/PhysRevLett.108.262501
© 2012 American Physical Society