ELPH研究会C035「実験、反応・構造計算、格子QCD で解き明かすハドロン分光」

High resolution missing-mass spectroscopy of Ξ hypernuclei at J-PARC

Nov 9, 2023, 1:30 PM

20m

　三神峯ホール (東北大学電子光理学研究センター)

ハイパー核

Speaker

Ebata Kengo (Kyoto U.)

Description

The baryon interaction for the $S=-1$ system has been investigated in some spectroscopic experiments. On the other hand, the $S=-2$ system is not understood well, although results of emulsion experiments and femtoscopy were published recently. Spectroscopy of $\mathrm{\Xi }$, $\mathrm{\Lambda }\mathrm{\Lambda }$ hypernuclei plays an important role to reveal the more general baryon-baryon interaction.
In J-PARC, a missing-mass spectroscopic experiment for $\mathrm{\Xi }$ hypernuclei (J-PARC E70) started. In this experiment, $K^{-}$ beams are irradiated into a ${}^{12}\mathrm{C}$ target and produces $\mathrm{\Xi }$ hypernuclei, ${}_{\mathrm{\Xi }}^{12}\mathrm{Be}$. This energy spectrum is given by the missing-mass method, whose resolution is expected to be 2 MeV/$c^2$ (FWHM) which would be the best resolution among existing data. In June, 2023, the first commissioning run was successfully carried out.
In this talk, we will introduce the J-PARC E70 experiment, and report some preliminary results of the first commissioning run.

Presentation materials

ELPH_2023_kevata.pdf