Search for the Lightest Double- Λ Hypernucleus, ΛΛ5 H, at J-PARC

Hiroyuki Fujioka, Shuhei Ajimura, Tomokazu Fukuda, Toshiyuki Gogami, Emiko Hiyama, Yuhei Morino, Toshio Motoba, Tomofumi Nagae, Sho Nagao, Akane Sakaue, Toshiyuki Takahashi, Yosuke Taki, Atsushi O. Tokiyasu, Makoto Uchida, Masaru Yosoi

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Investigations of double-Λ hypernuclei, which contain two Λ hyperons in a nucleus, provide valuable information on baryon–baryon interaction in the strangeness - 2 sector, such as the Λ –Λ interaction. Whereas several double-Λ hypernuclei have been discovered in nuclear-emulsion experiments, an experimental observation of ΛΛ5H is awaited. It is not only because ΛΛ5H is theoretically expected to be the lightest bound state, but also because Λ Λ –Ξ N coupling may play an important role in its structure. On the other hand, the coupling effect may be suppressed in ΛΛ6He.We propose an experiment to investigate ΛΛ5H at J-PARC. ΛΛ5H will be produced by a decay of a Ξ hypernucleus, Ξ7H, which can be produced by the 7Li (K-, K+) reaction. The mass of ΛΛ5H will be determined by means of decay pion spectroscopy; it can be calculated from the measured momentum of decay pions, owing to a two-body decay of ΛΛ5H.

Original languageEnglish
Article number47
JournalFew-Body Systems
Issue number3
Publication statusPublished - 2021 Sep

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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