Contribution of the ρ meson and quark substructure to the nuclear spin-orbit potential
Jun 4, 20209 pages
Published in:
- Phys.Rev.C 102 (2020) 2, 024331
- Published: Aug 26, 2020
e-Print:
- 2006.02698 [nucl-th]
DOI:
- 10.1103/PhysRevC.102.024331 (publication)
Citations per year
Abstract: (APS)
The microscopic origin of the spin-orbit (SO) potential in terms of sub-baryonic degrees of freedom is explored and discussed for application to nuclei and hypernuclei. We thus develop a chiral relativistic approach where the coupling to the scalar- and vector-meson fields are controlled by the quark substructure. This approach suggests that the isoscalar and isovector density dependence of the SO potential can be used to test the microscopic ingredients which are implemented in the relativistic framework: the quark substructure of the nucleon in its ground state and its coupling to the rich meson sector where the ρ meson plays a crucial role. This is also in line with the vector dominance model phenomenology and the known magnetic properties of the nucleons. We explore predictions based on Hartree and Hartree-Fock mean field, as well as various scenarios for the ρ-nucleon coupling, ranked as weak, medium, and strong, which impacts the isoscalar and isovector density dependence of the SO potential. We show that a medium-to-strong ρ coupling is essential to reproduce Skyrme phenomenology in N=Z nuclei as well as its isovector dependence. Assuming an SU(6) valence quark model, our approach is extended to hyperons and furnishes a microscopic understanding of the quenching of the NΛ spin-orbit potential in hypernuclei. It is also applied to other hyperons, such as Σ, Ξ, and Ω.Note:
- 9 pages, 3 tables
- Nuclear Structure
- model: vector dominance
- nucleon: structure
- spin: orbit
- isovector
- nucleus
- quark
- density dependence
- isoscalar
- mean field approximation
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