On the isoscalar-isovector splitting of pygmy dipole structures

Details On the isoscalar-isovector splitting of pygmy dipole structures On the isoscalar-isovector splitting of pygmy dipole structures

2009-05-29

arxiv.org/abs/0905.4848v1

Physics

Nuclear Physics

Nuclear Theory

4 pages, 5 figures, submitted to Physical Review Letters

Scientific paper

The electric dipole response of $^{140}$Ce is investigated using the fully consistent relativistic quasiparticle random phase approximation. By analyzing the isospin structure of the E1 response, it is shown that the low-energy (pygmy) strength separates into two segments with different isospin character. The more pronounced pygmy structure at lower energy is composed of predominantly isoscalar states with surface-peaked transition densities. At somewhat higher energy the calculated E1 strength is primarily of isovector character, as expected for the low-energy tail of the giant dipole resonance. The results are in qualitative agreement with those obtained in recent $(\gamma,\gamma')$ and $(\alpha,\alpha'\gamma)$ experiments, and provide a simple explanation for the splitting of low-energy E1 strength into two groups of states with different isospin structure and radial dependence of the corresponding transition densities.

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