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Strangeness & Hypernuclei

Baryon-baryon interaction are important for the understanding neutron stars and reveal the impact of strangeness in nuclear physics. Hypernuclei are an important source of information on their properties.

Strangeness & Hypernuclei

Excitation spectrum of 6-Li and 7-Lambda LiComparison of the excitation spectrum of 6-Li and 7-Lambda-Li for different hyperon-nucleon interactions.
Copyright: Hoai Le

We study the baryon-baryon interaction and baryonic few-body systems involving strange baryons (Lambda, Sigma, Xi). The employed framework, chiral effective field theory, incorporates the essential symmetries of quantum chromodynamics, the underlying fundamental theory of strong interaction. The interaction of strange baryons with ordinary nuclear matter is important for various aspects of nuclear physics. First, it provides a unique window for exploring the effects of explicit chiral symmetry breaking and of SU(3) flavor symmetry, both connected with the strange quark mass, on nuclear forces. Furthermore, the properties of these interactions play a significant role for our understanding of neutron stars. Their strength at densities around and above nuclear matter saturation density has an impact on the composition and stability of neutron stars  and strongly influences the mass and size of those objects.

The study of hypernuclei is essential for providing additional constraints on the properties of these interactions. We employ several methods, including the Jacobi No-Core Shell Model, to relate the interactions to such hypernuclei.