Giant and pigmy dipole resonances in 4He, 16,22O, and 40Ca from chiral nucleon-nucleon interactions

Abstract

We combine the coupled-cluster method and the Lorentz integral transform for the computation of inelastic reactions into the continuum. We show that the bound-state-like equation characterizing the Lorentz integral transform method can be reformulated based on extensions of the coupled-cluster equation-of-motion method, and we discuss strategies for viable numerical solutions. Starting from a chiral nucleon-nucleon interaction at next-to-next-to-next-to-leading order, we compute the giant dipole resonances of 4He, 16,22O and 40Ca, truncating the coupled-cluster equation-of-motion method at the two-particle-two-hole excitation level. Within this scheme, we find a low-lying E1 strength in the neutron-rich 22O nucleus, which compares fairly well with data from [Leistenschneider et al. Phys. Rev. Lett. 86, 5442 (2001)]. We also compute the electric dipole polariziability in 40Ca. Deficiencies of the employed Hamiltonian lead to overbinding, too small charge radii and a too small electric dipole polarizability in 40Ca.

14 pages, 14 figures, published version

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• Evolution of shell structure in neutron-rich calcium isotopes
• In-Medium Similarity Renormalization Group for Nuclei
• The Lorentz Integral Transform (LIT) method and its applications to perturbation induced reactions
• Medium-mass nuclei from chiral nucleon-nucleon interactions
• No-core shell model in an effective-field-theory framework
• Solution of the center-of-mass problem in nuclear structure calculations
• Complex coupled-cluster approach to an ab-initio description of open quantum systems
• Elastic proton scattering of medium mass nuclei from coupled-cluster theory
• The ${}^4$He total photo-absorption cross section with two- plus three-nucleon interactions from chiral effective field theory
• Neutron-${}^3$H scattering above the four-nucleon breakup threshold
• Inclusive electron scattering off 4He
• An efficient method for evaluating energy-dependent sum rules
• Photonuclear sum rules and the tetrahedral configuration of ${}^4$He

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• Zero- and finite-temperature electromagnetic strength distributions in closed- and open-shell nuclei from first principles
• ${}^{40}$Ca transverse response function from coupled-cluster theory
• Comparison of the electromagnetic responses of ${}^{12}$C obtained from the Green's function Monte Carlo and spectral function approaches
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• Efficacy of the symmetry-adapted basis for ab initio nucleon-nucleus interactions for light- and intermediate-mass nuclei
• Ab initio translationally invariant nucleon-nucleus optical potentials
• Quantum error mitigation for Fourier moment computation
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• Faster spectral density calculation using energy moments
• 16O electroweak response functions from first principles
• Spectral function for ${}^4$He using the Chebyshev expansion in coupled-cluster theory
• Structure and dynamics of open-shell nuclei from spherical coupled-cluster theory
• Perspectives on few-body cluster structures in exotic nuclei
• Low-energy dipole strength in 8He
• Theory of nuclear collective vibrations
• Computing nuclear response functions with time-dependent coupled-cluster theory
• Ab initio calculations of monopole sum rules: From finite nuclei to infinite nuclear matter
• Direct ab initio calculation of the ${}^4$He nuclear electric dipole polarizability
• From closed shells to open shells: Coupled-cluster calculations of atomic nuclei
• Recent applications of the subtracted second RPA method
• Electromagnetic sum rules for 22O from coupled-cluster theory
• Removing center of mass effects in response function and sum rule calculations based on the harmonic oscillator basis
• Ab initio calculations of nuclear charge radii across and beyond ${}^{132}$Sn: Putting chiral EFT nuclear interactions to the test