Introduction

　A Ξ hypernucleus, ¹²_ΞBe (a bound system of ¹¹B and Ξ^-) will be searched by the (K^-,K⁺) reaction at the K1.8 beam line in J-PARC (J-PARC E05 Experiment).

　There were old measurements with the same reaction, ¹²C(K^-,K⁺), at KEK and BNL. However, they could not find a clear evidence of a bound nuclear system with a Ξ^- hyperon. In the J-PARC E05 experiment, we will install a newly designed magnetic spectrometer S-2S (Strangeeness -2 Spectrometer). The introduction of S-2S allows us to achieve the energy resolution of a few MeV FWHM in a resulting hypernuclear spectrum, which would be the most sensitive measurement for a detection of Ξ hypernuclei.

　 A construction of the new spectrometer S-2S was completed. Detector commissioning is in progress. We are now developing an active fiber target.

Proposal (Status: Approved)

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