Pygmy and giant dipole resonances in Ni isotopes

Journal Article · Tue May 15 04:00:00 EDT 2007 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.75.054320· OSTI ID:20995282

Jun, Liang ^[1]; Ligang, Cao ^[1]; Zhongyu, Ma ^[1]

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1. China Institute of Atomic Energy, Beijing 102413 (China)

The isovector giant and pygmy dipole resonances in even-even Ni isotopes are studied within the framework of a fully consistent relativistic random-phase approximation built on the relativistic mean field ground state. An additional isoscalar-isovector nonlinear coupling term is adopted in the standard effective mean field Lagrangian, which could modify the density dependence of the symmetry energy and soften the symmetry energy at the saturation density without changing the agreement with experimentally existing data of ground state properties. We found that the centroid energy of the isovector giant dipole resonance is tightly correlated to the neutron skin thickness. In contrast, the centroid energy of the isovector pygmy resonance is insensitive to the density dependence of the symmetry energy by tuning the isoscalar-isovector nonlinear coupling.

• OSTI ID: 20995282
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 5 Vol. 75; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
DENSITY
DIPOLES
GROUND STATES
ISOVECTORS
LAGRANGIAN FUNCTION
MEAN-FIELD THEORY
NEUTRONS
NICKEL ISOTOPES
NONLINEAR PROBLEMS
RANDOM PHASE APPROXIMATION
RELATIVISTIC RANGE
RESONANCE
SYMMETRY