Low-energy monopole strength in exotic Nickel isotopes

Abstract

Low-energy strength is predicted for the isoscalar monopole response of neutron-rich Ni isotopes, in calculations performed using the microscopic Skyrme HF+RPA and relativistic RHB+RQRPA models. Both models, although based on different energy density functionals, predict the occurrence of pronounced monopole states in the energy region between 10 MeV and 15 MeV, well separated from the isoscalar GMR. The analysis of transition densities and corresponding particle-hole configurations shows that these states represent almost pure neutron single hole-particle excitations. Even though their location is not modified with respect to the corresponding unperturbed states, their (Q)RPA strength is considerably enhanced by the residual interaction. The theoretical analysis predicts the gradual enhancement of low-energy monopole strength with neutron excess.

4 pages, 6 figures, submitted to Physical Review C

References in corpus (3)

• Exotic modes of excitation in atomic nuclei far from stability
• Self-consistent description of multipole strength: systematic calculations
• Decay Pattern of Pygmy States Observed in Neutron-Rich 26 Ne

Cited by in corpus (21)

• The Compression-Mode Giant Resonances and Nuclear Incompressibility
• Nuclear Equation of State from ground and collective excited state properties of nuclei
• Structure of ${}^{78}$Ni from first principles computations
• The many facets of the (non relativistic) Nuclear Equation of State
• Excitation of Giant Monopole Resonance in ${}^{208}$Pb and ${}^{116}$Sn Using Inelastic Deuteron Scattering
• Incompressibility of finite fermionic systems: stable and exotic atomic nuclei
• Emergent Soft Monopole Modes in Weakly-Bound Deformed Nuclei
• Magnetic dipole excitations based on the relativistic nuclear energy density functional
• Neutral-current neutrino-nucleus cross sections based on relativistic nuclear energy density functional
• Large-scale calculations of supernova neutrino-induced reactions in Z=8-82 target nuclei
• Pigmy resonance in monopole response of neutron-rich Ni isotopes ?
• Low-energy cluster vibrations in N = Z nuclei
• Two-neutrino double-beta decay matrix elements based on relativistic nuclear energy density functional
• Modeling nuclear weak-interaction processes with relativistic energy density functionals
• Nuclear breathing mode in neutron-rich Nickel isotopes: sensitivity to the symmetry energy and the role of the continuum
• Emergence of low-energy monopole strength in the neutron-rich calcium isotopes
• Soft breathing modes in neutron--rich nuclei with the subtracted second random--phase approximation
• The evolution of magnetic dipole strength in ${}^{100-140}$ Sn isotope chain and quenching of nucleon g factors
• Low-energy monopole strength in spherical and deformed nuclei : cluster and soft modes
• Nuclear multipole responses from chiral effective field theory interaction
• Recent applications of the subtracted second RPA method