The lightest neutral hypernuclei with strangeness -1 and -2

Abstract

Our current knowledge of the baryon--baryon interaction suggests that the dineutron $(n,n)$ and its strange analogue $(n,\Lambda )$ are unstable. In contrast, the situation is more favorable for the strange three-body system $(n,n,\Lambda )$, and even better for the four-body system $T\equiv (n,n,\Lambda ,\Lambda )$ with strangeness $-2$, which is likely to be stable under spontaneous dissociation. The recent models of the hyperon-nucleon and hyperon-hyperon interactions suggest that the stability of the $(n,n,\Lambda )$ and $T$ is possible within the uncertainties of our knowledge of the baryon-baryon interactions. This new nucleus $T$ could be produced and identified in central deuteron--deuteron collisions via reaction $d+d\to T+K^{+}+K^{+}$, and the tetrabaryon $T$ could play an important role in catalyzing the formation of a strange core in neutron stars.

Revised version accepted by PRC

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• Conceptual design of the Spin Physics Detector
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• Heavy flavor dibaryons
• The onset of $\Lambda \Lambda$ hypernuclear binding
• Constraints on the $\Lambda$-neutron interaction from charge symmetry breaking in the ${}_{\mathbf{\Lambda }}^4\mathbf{He}$--${}_{\mathbf{\Lambda }}^4\mathbf{H}$ hypernuclei
• Maximal isospin few-body systems of nucleons and $\Xi$ hyperons
• Examination of experimental conditions for the production of proton-rich and neutron-rich hypernuclei
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• Hadrons and Few-Body Physics
• Neutral baryonic systems with strangeness
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• ${\Xi }^{-}t$ quasibound state instead of $\Lambda \Lambda nn$ bound state
• Strangeness in nuclei and neutron stars: a challenging puzzle