Spin-dipole strength functions of ${}^4$He with realistic nuclear forces

Abstract

Both isoscalar and isovector spin-dipole excitations of ${}^4$He are studied using realistic nuclear forces in the complex scaling method. The ground state of ${}^4$He and discretized continuum states with $J^{\pi }=0^{-},1^{-},2^{-}$ for A=4 nuclei are described in explicitly correlated Gaussians reinforced with global vectors for angular motion. Two- and three-body decay channels are specifically treated to take into account final state interactions. The observed resonance energies and widths of the negative-parity levels are all in fair agreement with those calculated from both the spin-dipole and electric-dipole strength functions as well as the energy eigenvalues of the complex scaled Hamiltonian. Spin-dipole sum rules, both non energy-weighted and energy-weighted, are discussed in relation to tensor correlations in the ground state of ${}^4$He.

18 pages, 8 figures

References in corpus (6)

• Global-Vector Representation of the Angular Motion of Few-Particle Systems II
• Neutrino Nucleus Reactions based on New Shell Model Hamiltonians
• Inversion doublets of 3N+N cluster structure in excited states of ${}^4$He
• Ab initio study of the photoabsorption of ${}^4$He
• Fine structure of charge-exchange spin-dipole excitations in ${}^{16}$O
• Low-Energy Inelastic Neutrino Reactions on 4He

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• Emergence of nuclear clustering in electric-dipole excitations of ${}^6$Li
• Charge-exchange dipole excitations in deformed nuclei
• Harmonic-oscillator excitations of precise few-body wave functions
• Physics of many-body resonances with complex scaling and applications to light unstable nuclei
• Neutrino Induced 4He Break-up Reaction -- Application of the Maximum Entropy Method in Calculating Nuclear Strength Function
• Electric-dipole transitions in ${}^6$Li with a fully microscopic six-body calculation