Structure of S =-2 Hypernuclei and hyperon-hyperon interactions

Emiko Hiyama, Kazuma Nakazawa

Research output: Contribution to journalReview articlepeer-review

37 Citations (Scopus)


We review recent progress in S=-2 hypernuclei such as double-Λ hypernuclei and Ξ hypernuclei, which are composed of a nucleus and one or two hyperons, such as a Λ or a Ξ particle. Through observations of 6 λλHe, such as the Nagara event, we obtain important information about the ΛΛ interaction. Using this information, we perform a four-body calculation of ααΛΛ for 10 ΛΛBe, which was observed at KEK as the Demachi-Yanagi event. We interpret this event as the 2+ excited state. We calculate energy levels of Be within the framework of an ααnΛΛ five-body cluster model, and then interpret the Hida event, which was observed at KEK as the ground state of 11 ΛΛBe. Motivated by observation of the Kiso event of C, by using the Skyrme-Hartree-Fock and relativistic mean-field frameworks, we calculate the energy spectra of this hypernucleus. We interpret this event as the 14N(g.s.)+Ξ - (0p) state. Finally, we propose an experiment on H and Li to extract information about the spin- and isospin-averaged parts of the ΞN interaction.

Original languageEnglish
Pages (from-to)131-159
Number of pages29
JournalAnnual Review of Nuclear and Particle Science
Publication statusPublished - 2018 Oct 19
Externally publishedYes


  • few-body problem
  • hypernuclear physics
  • hyperon-hyperon interaction
  • nuclear emulsion

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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