High-resolution measurement of hypernuclear events in a nuclear emulsion with hard X-ray microscopy

The study on doubly-strange hypernuclei has been performed with nuclear emulsion detector at KEK-PS and J-PARC for 30 years. Detected 47 candidate events of doubly-strange hypernuclei show character-istics for the Λ-Λ and Ξ-N interactions. The Λ-Λ interaction is weakly at-tractive and the binding energy of two Λ hyperons to nuclei shows linear dependence on the mass number of a nucleus. The Ξ– hyperon is found to be bound by the 14N nucleus, forming the 1Ξ5C hypernucleus, with larger energy than that given by Coulomb force. Also, the level scheme of the Ξ– hyperon in the 1Ξ5C hypernucleus can be seen. With the light source of hard X-ray instead of an optical microscope, since it will enable to count grains constituting tracks in the emulsion, charge recognitions of light nuclei, especially H+ and He2+, can be possible. This would work effectively in determining the nuclides of doubly-strange hypernuclei. The ‘overall-scanning method’ to scan whole volume of the emulsion sheets will allow to detect nearly 1 x 103 events of doubly-strange hypernuclei, which is the expected number recorded in the emulsion of the E07 experiment, with machine learning in the near future.

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High-resolution measurement of hypernuclear events in a nuclear emulsion with hard X-ray microscopy

Cited by 3 publications

References 25 publications

Experimental Aspect of S = –2 Hypernuclei

Experimental Aspect of S = –2 Hypernuclei

Experimental Aspect of S = –2 Hypernuclei

Information and perspective for doubly-strange hypernuclei with nuclear emulsion detector

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