Abstract
Strange means 1) unusual or surprising, especially in a way that is difficult to explain or understand or 2) having strangeness degree of freedom. Light nuclear systems with strangeness, light hypernuclei, are perfect playground to study baryon force which would be a bridge between well established nuclear force in low energy region and QCD, the first principle of the strong interaction. Overview of study of light hypernuclei is given and recent experimental findings are reviewed.
Highlights
Nuclear physics aims to understand many-body system interacting by the nuclear force
QCD is the first principle of the strong interaction but direct deduction of nuclear force from it is not yet achieved though recent development of lattice QCD calculation would hopefully bridge between QCD and nuclear force in near future
Extension of the nuclear force to the baryon force by introducing quark degree of freedom other than up and down quarks will help to fill the gap between QCD and the nuclear force
Summary
Nuclear physics aims to understand many-body system interacting by the nuclear force. Based on rich nucleon-nucleon scattering data, nuclear force is well modeled and the nuclear structure can be discussed with the established nuclear force. Due to limited data on hyperon-nucleon scattering data, understanding of the YN interaction is much less satisfactory when compared to the NN interaction. Hypernuclear structure is calculated with the assumed YN interaction models and the results are compared with the experimental data to feed back the information to the YN interaction models. Data of hypernuclei measured with the state-of-art experimental techniques and modern theoretical techniques well tested for normal nuclei, have been serving to develop the YN interaction models. Light hypernuclei are important to extract information about the YN interaction while heavier hypernuclear system provides ideal test ground for baryon behavior in nuclear matter
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