Concentration of electric dipole strength below the neutron separation energy in N = 82 nuclei

Abstract

The semi-magic nuclei Ba-138, Ce-140, and Sm-144 have been investigated in photon scattering experiments up to an excitation energy of about 10 MeV. The distribution of the electric dipole strength shows a resonance like structure at energies between 5.5 and 8 MeV exhausting up to 1% of the isovector E1 Energy Weighted Sum Rule.

10 pages, 3 figures

References in corpus (7)

• On dipole compression modes in nuclei
• Isoscalar dipole mode in relativistic random phase approximation
• Toroidal dipole resonances in the relativistic random phase approximation
• Experimental simulation of a stellar photon bath by bremsstrahlung: the astrophysical $\gamma$-process
• Composition of the nuclear periphery from antiproton absorption
• Far infrared giant dipole resonances in neutral quantum dots
• Pigmy resonances in artificial nuclei: far-infrared absorption by electron-hole droplets

Cited by in corpus (38)

• The r-process of stellar nucleosynthesis: Astrophysics and nuclear physics achievements and mysteries
• Exotic modes of excitation in atomic nuclei far from stability
• Quasiparticle random phase approximation based on the relativistic Hartree-Bogoliubov model
• Isospin Character of the Pygmy Dipole Resonance in 124Sn
• Probing the Nuclear Neutron Skin by Low-Energy Dipole Modes
• Neutron skins of atomic nuclei: per aspera ad astra
• Emergence of pygmy dipole resonances: Magic numbers and neutron skins
• Relativistic Random-Phase Approximation with density-dependent meson-nucleon couplings
• Information content of the low-energy electric dipole strength: correlation analysis
• Low-energy isovector and isoscalar dipole response in neutron-rich nuclei
• Isotopic dependence of the pygmy dipole resonance
• Fragmentation and systematics of the Pygmy Dipole Resonance in the stable N=82 isotones
• Relativistic quasiparticle time blocking approximation. II. Pygmy dipole resonance in neutron-rich nuclei
• Dipole responses in Nd and Sm isotopes with shape transitions
• Low-energy dipole strength in 112,120Sn
• BRUSLIB and NETGEN: the Brussels nuclear reaction rate library and nuclear network generator for astrophysics
• Isospin properties of electric dipole excitations in 48Ca
• Direct determination of photodisintegration cross sections and the p-process
• Relativistic two-phonon model for low-energy nuclear response
• Nuclear deformation and neutron excess as competing effects for pygmy dipole strength
• Electric dipole response of neutron-rich Calcium isotopes in relativistic quasiparticle time blocking approximation
• Dipole response in 208Pb within a self-consistent multiphonon approach
• Pygmy Dipol Resonances as a Manifestation of the Structure of the Neutron-Rich Nuclei
• Isoscalar dipole coherence at low energies and forbidden E1 strength
• Astrophysical relevance of $\gamma$ transition energies
• Low-energy dipole strength and the critical case of 48Ca
• Low-energy dipole excitations towards the proton drip-line: doubly magic 48Ni
• The quest for novel modes of excitation in exotic nuclei
• Elasticity of nuclear medium as a principal macrodynamical promoter of electric dipole pygmy resonance
• Fragmentation of electric dipole strength in N=82 isotones
• The decay of quadrupole-octupole $1^{-}$ states in ${}^{40}$Ca and ${}^{140}$Ce
• Crossover from skin-mode to proton-neutron-mode in $E1$ excitations of neutron-rich nuclei
• Nuclear structure far from stability
• Spectroscopic features of low-energy excitations in skin nuclei
• Crucial inputs to nucleosynthesis calculations
• Pygmy resonances and symmetry energy
• Nuclear pygmy modes and the dynamics of the nuclear skin
• Relativistic description of exotic collective excitation phenomena in atomic nuclei