Bound States and Molecular Structure of Systems with Hyperons

  • Yoshinori Akaishi
Conference paper
Part of the Few-Body Systems book series (FEWBODY, volume 6)


Microscopic calculations are done for ∑-hypernuclear few-body systems by a method named ATMS. Among two-to five-body systems, only the 4 He(0+) and 4 H(0+) hypernuclei are expected to be bound: The binding energy and the width of the former are calculated to be 3.7 ~ 4.6 MeV and 4.5 ~ 7.9 MeV, respectively. The observation of 4 He at KEK is in good agreement with the above prediction. The nucleus-∑ potential has a strong Lane term and a repulsive bump at short distance. The Lane term makes the system bound and the bump suppresses the ∑N-ΛN conversion. X-ray measurement of level shifts in the 4He-∑-, 3He-∑- and 3H-E- atoms can provide another information on the Lane term.

In 208Pb, there may exist a peculiar state, Coulomb-assisted (atom-nucleus) hybrid state, where ∑- is trapped in the surface region by the strong interaction with the aid of the inner centrifugal repulsion and the outer Coulomb attraction.

An analysis is given for new data of Ξ-·12C atomic or nuclear systems from the emulsion-counter experiment at KEK. The double-Λ hypernucleus formation rate is calculated for a stopped Ξ- on 4He. A high branching ratio of 37% is obtained for the ΛΛ 4 H formation from a Ξ- ·4He atom. The detection of about 2.3 MeV neutron is proposed to search for lightest double-Λ hypernucleus ΛΛ 4 H.


Centrifugal Potential Central Repulsion Double Hypernucleus High Orbital Angular Momentum Conversion Width 


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Copyright information

© Springer-Verlag 1992

Authors and Affiliations

  • Yoshinori Akaishi
    • 1
  1. 1.Department of PhysicsHokkaido UniversitySapporo 060Japan

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