Ab Initio Optical Potentials and Nucleon Scattering on Medium Mass Nuclei

Abstract

We derive ab initio optical potentials from self-consistent Green's function (SCGF) theory and compute the elastic scattering of neutrons off oxygen and calcium isotopes. The comparison with scattering data is satisfactory at low scattering energies. The method is benchmarked against nocore shell model with continuum (NCSMC) calculations, showing that virtual excitations of the target are crucial to predict proper fragmentation and absorption at higher energies. This is a significant step toward deriving optical potentials for medium mass nuclei and complex many-body systems in general.

Elastic transfer and parity dependence of the nucleus-nucleus optical potential

“…[1][2][3][4]); however, more recently, the focus is increasingly moving toward extracting this quantity from first principles, without any fitting parameters (e.g., Refs. [5][6][7][8][9][10]). For lighter systems, computations can cover most of Hilbert space and predictions compare well with data (e.g., Ref.…”

Proton elastic scattering on calcium isotopes from chiral nuclear optical potentials

“…The cross sections calculated from the chiral optical potential are given by the blue bands. The dot dashed black curve represents ab initio calculations found in Ref [54]…”

Self-Consistent Green's Function Theory for Atomic Nuclei

“…It is characterized by a simultaneous fit of 2N and 3N LECs that does not rely solely on two-nucleon and A = 3, 4 data, but also on binding energies of 14 C and 16,22,24,25 O as well as charge radii of 14 C and 16 O. The resulting interaction, named NNLO sat , successfully describes the saturation of infinite nuclear matter [98] as well as various observables in mid-mass nuclei, including charge radii [42][43][44]53]. Unlike the NN+3N(400) interaction, NNLO sat employs a non-local regulator.…”

“…Excited states of even-even systems were addressed in the form of the electromagnetic dipole response in [42]. In [43], ab initio optical potentials were computed and applied in elastic scattering off 16 O and 40 Ca. Barbieri et al [44] instead discussed lepton-nucleus scattering, with particular attention to neutrino scattering off 40 Ar.…”