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$^{5}_{\Lambda\Lambda}\mathrm{H}$ production experiment by use of $^7_{\Xi}\mathrm{H}$ production and decay at J-PARC

Not scheduled
15m
2nd Floor

2nd Floor

Renaissance Portsmouth-Norfolk Waterfront Hotel 425 Water Street Portsmouth, VA 23704
Abstract Submission

Speaker

Prof. Hiroyuki Fujioka (Tokyo Institute of Technology)

Description

Double-$\Lambda$ hypernuclei have been investigated for more than half a century, and several double-$\Lambda$ hypernuclei have been found in nuclear emulsion. While they were produced by $\Xi^-$ capture in light nuclei, Kumagai-Fuse and Akaishi proposed a possibility to produce a double-$\Lambda$ hypernucleus as a decay product of a $\Xi$ hypernucleus [1]. According to their calculation, the branching ratio of ${}^7_{\Xi}\mathrm{H}\to {}^5_{\Lambda\Lambda}\mathrm{H}+2n$ is as large as 90%, because many-body decay such as $^4_{\Lambda}\mathrm{H}+\Lambda+2n$ is disfavored due to its small $Q$-value. The existence of the $^{7}_{\Xi}\mathrm{H}$ bound state is predicted in a more recent calculation [2]. In this contribution, we will discuss a possible experiment for $^5_{\Lambda\Lambda}\mathrm{H}$ production using the $^7\mathrm{Li}(K^-,K^+){}^7_{\Xi}\mathrm{H}$ reaction, followed by the $^7_{\Xi}\mathrm{H}\to {}^5_{\Lambda\Lambda}\mathrm{H}+2n$ decay. A simultaneous study of $\Xi$ hypernuclei and Double-$\Lambda$ hypernuclei will give an insight into $\Xi N$-$\Lambda\Lambda$ 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).

Primary author

Prof. Hiroyuki Fujioka (Tokyo Institute of Technology)

Co-authors

Prof. Emiko Hiyama (Kyushu University and RIKEN Nishina Center) Prof. Tomokazu Fukuda (RIKEN Nishina Center)

Presentation materials

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