Fine structure of the isoscalar giant quadrupole resonance in 40Ca due to Landau damping?

Abstract

The fragmentation of the Isoscalar Giant Quadrupole Resonance (ISGQR) in 40Ca has been investigated in high energy-resolution experiments using proton inelastic scattering at E_p = 200 MeV. Fine structure is observed in the region of the ISGQR and its characteristic energy scales are extracted from the experimental data by means of a wavelet analysis. The experimental scales are well described by Random Phase Approximation (RPA) and second-RPA calculations with an effective interaction derived from a realistic nucleon-nucleon interaction by the Unitary Correlation Operator Method (UCOM). In these results characteristic scales are already present at the mean-field level pointing to their origination in Landau damping, in contrast to the findings in heavier nuclei and also to SRPA calculations for 40Ca based on phenomenological effective interactions, where fine structure is explained by the coupling to two-particle two-hole (2p-2h) states.

arXiv commentPhys. Lett. B, in press

References in corpus (19)

• A unitary correlation operator method
• Extended Theory of Finite Fermi Systems (Collective Vibrations in Closed Shell Nuclei)
• Nuclear Structure in the Framework of the Unitary Correlation Operator Method
• Matrix Elements and Few-Body Calculations within the Unitary Correlation Operator Method
• Hartree-Fock and Many-Body Perturbation Theory with Correlated Realistic NN-Interactions
• Effects of the Tensor Force on the Multipole Response in Finite Nuclei
• Collective nuclear excitations with Skyrme-Second RPA
• Second RPA and correlated realistic interactions
• Large-scale second RPA calculations with finite-range interactions
• Collective multipole excitations based on correlated realistic nucleon-nucleon interactions
• Multiple Scales in the Fine Structure of the Isoscalar Giant Quadrupole Resonance in ^{208}Pb
• Systematics of binding energies and radii based on realistic two-nucleon plus phenomenological three-nucleon interactions
• Multiscale fluctuations in nuclear response
• Scaling Analysis of Fluctuating Strength Function
• RPA calculations with Gaussian expansion method
• Fluctuation properties of strength functions associated with giant resonances
• Excited-State Density Distributions of Neutron-Rich Unstable Nuclei
• Time scales in nuclear giant resonances
• Fluctuation properties of strength function associated with the giant quadrupole resonance in 208Pb

Cited by in corpus (16)

• Nuclear Equation of State from ground and collective excited state properties of nuclei
• Electric and magnetic dipole modes in high-resolution inelastic proton scattering at $0^{\circ }$
• Fine structure of the isovector giant dipole resonance in 208Pb: Characteristic scales and level densities
• Equation of Motion Method to strongly correlated Fermi systems and Extended RPA approaches
• Second random-phase approximation, Thouless' theorem and the stability condition reexamined and clarified
• Fine Structure of the Isovector Giant Dipole Resonance in ${}^{142-150}$Nd and ${}^{152}$Sm
• Wavelet signatures of $K$-splitting of the Isoscalar Giant Quadrupole Resonance in deformed nuclei from high-resolution (p,p${}^{\prime }$) scattering off ${}^{146,148,150}$Nd
• Origin of fine structure of the giant dipole resonance in sd-shell nuclei
• Damping of the isovector giant dipole resonance in ${}^{40,48}$Ca
• Studies of the Giant Dipole Resonance in ${}^{27}$Al, ${}^{40}$Ca, ${}^{56}$Fe, ${}^{58}$Ni and ${}^{208}$Pb with high energy-resolution inelastic proton scattering under 0${}^{\circ }$
• Gross, intermediate and fine structure of nuclear giant resonances: Evidence for doorway states
• A systematic study of giant quadrupole resonances with the subtracted second random--phase approximation: beyond--mean--field centroids and fragmentation
• Level density of 2+ states in 40Ca from high energy-resolution (p,p') experiments
• Angela and the electric dipole response -- giant and pygmy, hot and cold, isoscalar and isovector
• Fine structure of the isoscalar giant monopole resonance in ${}^{48}$Ca
• Recent applications of the subtracted second RPA method