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A serious inconsistency between theory and observation for the mass of hyperon-mixed neutron stars strongly suggests the missing of some “extra repulsion” in hypernuclear systems. The mechanism is remarked, and as such microscopic origins of repulsion, the 3-body forces from an extended 2π exchange via isobar Δ excitation type (2πΔ) and from a viewpoint of latent effects for two-baryon overlapping in a string-junction quark model (SJM) are tested. It is remarked that the combined effects from these two processes (2πΔ+SJM) is a promising candidate to solve the confronting problem, keeping the consistency with the saturation property of nuclear matter.
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Takatsuka et al. (2008) studied this question.
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