HYP2018: 13th International Conference on Hypernuclear and Strange Particle Physics

ΛΛ5H production experiment by use of Ξ7H production and decay at J-PARC

Not scheduled

15m

2nd Floor

Abstract Submission

Speaker

Prof. Hiroyuki Fujioka (Tokyo Institute of Technology)

Description

Double-$\mathrm{\Lambda }$ hypernuclei have been investigated for more than half a century, and several double-$\mathrm{\Lambda }$ hypernuclei have been found in nuclear emulsion. While they were produced by ${\mathrm{\Xi }}^{-}$ capture in light nuclei, Kumagai-Fuse and Akaishi proposed a possibility to produce a double-$\mathrm{\Lambda }$ hypernucleus as a decay product of a $\mathrm{\Xi }$ hypernucleus [1]. According to their calculation, the branching ratio of ${}_{\mathrm{\Xi }}^7\mathrm{H}\to {}_{\mathrm{\Lambda }\mathrm{\Lambda }}^5\mathrm{H}+2n$ is as large as 90%, because many-body decay such as ${}_{\mathrm{\Lambda }}^4\mathrm{H}+\mathrm{\Lambda }+2n$ is disfavored due to its small $Q$-value. The existence of the ${}_{\mathrm{\Xi }}^7\mathrm{H}$ bound state is predicted in a more recent calculation [2]. In this contribution, we will discuss a possible experiment for ${}_{\mathrm{\Lambda }\mathrm{\Lambda }}^5\mathrm{H}$ production using the ${}^7\mathrm{Li}(K^{-},K^{+}){}_{\mathrm{\Xi }}^7\mathrm{H}$ reaction, followed by the ${}_{\mathrm{\Xi }}^7\mathrm{H}\to {}_{\mathrm{\Lambda }\mathrm{\Lambda }}^5\mathrm{H}+2n$ decay. A simultaneous study of $\mathrm{\Xi }$ hypernuclei and Double-$\mathrm{\Lambda }$ hypernuclei will give an insight into $\mathrm{\Xi }N$-$\mathrm{\Lambda }\mathrm{\Lambda }$ mixing and conversion, which is one of the most important features in the $S=-2$ sector. References 1. Kumagai-Fuse and Y. Akaishi, Phys. Rev. C 54, R24 (1996). 2. E. Hiyama, Y. Yamamoto, T. Motoba, T. A. Rijken, and M. Kamimura, Phys. Rev. C 78, 054316 (2008).