Magnetic dipole excitations based on the relativistic nuclear energy density functional

Abstract

Magnetic dipole (M1) excitations build not only a fundamental mode of nucleonic transitions, but they are also relevant for nuclear astrophysics applications. We have established a theory framework for description of M1 transitions based on the relativistic nuclear energy density functional. For this purpose the relativistic quasiparticle random phase approximation (RQRPA) is established using density dependent point coupling interaction DD-PC1, supplemented with the isovector-pseudovector interaction channel in order to study unnatural parity transitions. The introduced framework has been validated using the M1 sum rule for core-plus-two-nucleon systems, and employed in studies of the spin, orbital, isoscalar and isovector M1 transition strengths, that relate to the electromagnetic probe, in magic nuclei ${}^{48}$Ca and ${}^{208}$Pb, and open shell nuclei ${}^{42}$Ca and ${}^{50}$Ti. In these systems, the isovector spin-flip M1 transition is dominant, mainly between one or two spin-orbit partner states. It is shown that pairing correlations have a significant impact on the centroid energy and major peak position of the M1 mode. The M1 excitations could provide an additional constraint to improve nuclear energy density functionals in the future studies.

13 pages, 7 figures, accepted for publication in Physical Review C

References in corpus (42)

• Novel features of nuclear forces and shell evolution in exotic nuclei
• Nuclear weak-interaction processes in stars
• Exotic modes of excitation in atomic nuclei far from stability
• Relativistic Nuclear Energy Density Functionals: adjusting parameters to binding energies
• Theory of neutrinoless double beta decay
• Magnetic dipole excitations in nuclei: elementary modes of nucleonic motion
• DIRHB -- a relativistic self-consistent mean-field framework for atomic nuclei
• Quasiparticle random phase approximation based on the relativistic Hartree-Bogoliubov model
• Nuclear Equation of State from ground and collective excited state properties of nuclei
• Isovector Giant Dipole Resonance from the 3D Time-Dependent Density Functional Theory for Superfluid Nuclei
• Supernova Inelastic Neutrino-Nucleus Cross Sections from High-Resolution Electron Scattering Experiments and Shell-Model Calculations
• Relativistic Random-Phase Approximation with density-dependent meson-nucleon couplings
• Effects of Inelastic Neutrino-Nucleus Scattering on Supernova Dynamics and Radiated Neutrino Spectra
• Beta-decay rates of r-process nuclei in the relativistic quasiparticle random phase approximation
• Relativistic RPA in axial symmetry
• Effects of the Tensor Force on the Multipole Response in Finite Nuclei
• Inclusive charged-current neutrino-nucleus reactions calculated with the relativistic quasiparticle random phase approximation
• Optimizing the relativistic energy density functional with nuclear ground state and collective excitation properties
• Systematic investigation of low-lying dipole modes using the canonical-basis time-dependent Hartree-Fock-Bogoliubov theory
• Quantum Monte Carlo calculations of magnetic moments and M1 transitions in A<=7 nuclei including meson-exchange currents
• Skyrme-Rpa Description of Spin-Flip M1 Giant Resonance
• Low-energy multipole response in nuclei at finite temperature
• Electromagnetic M1 transition strengths from inelastic proton scattering: The cases of 48Ca and 208Pb
• Covariance analysis for Energy Density Functionals and instabilities
• Neutron star structure and collective excitations of finite nuclei
• Spin-flip M1 giant resonance as a challenge for Skyrme forces
• Low-energy monopole strength in exotic Nickel isotopes
• Testing Skyrme energy-density functionals with the QRPA in low-lying vibrational states of rare-earth nuclei
• Relativistic Hartree-Fock-Bogoliubov model for deformed nuclei
• Magnetic dipole excitations of ${}^{50}$Cr
• M1 Resonances in Unstable Magic Nuclei
• Elimination of spurious modes within QRPA
• Pygmy dipole mode in deformed neutron-rich Mg isotopes close to the drip line
• Experimental status of the nuclear spin scissors mode
• Low-energy M1 excitations in ${}^{208}$Pb and the spin channel of the Skyrme energy-density functional
• Measurements of the 48Ca(γ,n) Reaction
• Optimizing relativistic energy density functionals: covariance analysis
• Hybrid method to resolve the neutrino mass hierarchy by supernova (anti)neutrino induced reactions
• Impurity effect of Lambda particle on the structure of 18F and 19F_Lambda
• Magnetic dipole excitation and its sum rule in nuclei with two valence nucleons
• Modeling nuclear weak-interaction processes with relativistic energy density functionals
• On the importance of using exact pairing in the study of pygmy dipole resonance

Cited by in corpus (8)

• Microscopic analysis of low-energy spin and orbital magnetic dipole excitations in deformed nuclei
• Non-iterative finite amplitude methods for E1 and M1 giant resonances
• QRPA calculations for M1 transitions with the noniterative finite amplitude method and the application to neutron radiative capture cross sections
• The evolution of magnetic dipole strength in ${}^{100-140}$ Sn isotope chain and quenching of nucleon g factors
• Benchmark of many-body approaches for magnetic dipole transition strength
• Magnetic quadrupole transitions in the relativistic energy density functional theory
• Symmetry breaking of Gamow-Teller and magnetic-dipole transitions and its restoration in calcium isotopes
• Microscopic analysis of dipole electric and magnetic strengths in ${}^{156}$Gd