Electromagnetic Dipole Strength in Transitional Nuclei

Abstract

Electromagnetic dipole absorption cross-sections of transitional nuclei with large-amplitude shape fluctuations are calculated in a microscopic way by introducing the concept of Instantaneous Shape Sampling. The concept bases on the slow shape dynamics as compared to the fast dipole vibrations. The elctromagnetic dipole strength is calculated by means of RPA for the instantaneous shapes, the probability of which is obtained by means of IBA. Very good agreement with the experimental absorption cross sections near the nucleon emission threshold is obtained.

4 pages, 4 figures

References in corpus (6)

• Astrophysical Reaction Rates From Statistical Model Calculations
• Relativistic quasiparticle time blocking approximation. Dipole response of open-shell nuclei
• Dipole states in stable and unstable nuclei
• Pygmy dipole strength in 90Zr
• Quadrupole shape invariants in the interacting boson model
• Low-energy Dipole Excitations in Nuclei at the N=50,82 and Z=50 Shell Closures as Signatures for a Neutron Skin

Cited by in corpus (8)

• Experimental study of the electric dipole strength in the even Mo nuclei and its deformation dependence
• Nuclear deformation and neutron excess as competing effects for pygmy dipole strength
• Astrophysical S-factors for fusion reactions involving C, O, Ne and Mg isotopes
• Microscopic Calculation of IBM Parameters by Potential Energy Surface Mapping
• Breaking of axial symmetry in excited heavy nuclei as identified in Giant Dipole Resonance data
• Instantaneous Shape Sampling - a model for the $\gamma$-absorption cross section of transitional nuclei
• Effect of broken axial symmetry on the electric dipole strength and the collective enhancement of level densities in heavy nuclei
• Consequences of broken axial symmetry in heavy nuclei -- an overview of the situation in the valley of stability