Jun 22 – 27, 2023
Auditorium Maximum
Europe/Warsaw timezone

Knowledge on doubly-strange hypernuclei and experimental prospect

Jun 26, 2023, 10:30 AM
Medium lecture hall (A and B) (Auditorium Maximum)

Medium lecture hall (A and B)

Auditorium Maximum

Invited Plenary session


Kazuma Nakazawa (RIKEN)


The interaction energy between Λ hyperons and the presence or absence of Ξ hypernuclei (is Ξ hyperons bound to the nuclei?), which can be obtained from doubly-strange hypernuclei, are essential information for a unified understanding of baryons under SU(3)f symmetry. Especially in recent years, they are also valuable information for understanding the existence of neutron stars. Over the past 40 years, doubly-strange hypernucleus search experiments have been conducted in Japan using nuclear emulsion, and 47 samples of doubly-strange hypernuclei have been detected. From the double-Λ hypernuclei, we know that the Λ-Λ interaction between two Λ hyperons is weakly attractive and that the binding energy of two Λ hyperons by the nucleus seems to depend linearly on the nuclear mass number. In addition, the Ξ hypernucleus does indeed exist, the attraction between Ξ hyperon and nucleon works, and the level structure of the 15ΞC hypernucleus can now be inferred. Efforts are being made to further explore the entire emulsion volume to dramatically improve the number of the samples of doubly-strange hypernuclei.

Collaboration KEK-E176, E373, J-PARC E07, and Emulsion-ML

Primary author

Kazuma Nakazawa (RIKEN)

Presentation materials