Speaker
Description
Spectroscopy of hypernuclei with strangeness $-2$ is important to extract information on hyperon-nucleon and hyperon-hyperon interactions. In J-PARC, followed by a hybrid-emulsion experiment, a series of counter experiments with a newly constructed high-resolution spectrometer S-2S will be performed in near future. In particular, We propose an experiment (J-PARC E75 experiment) to investigate both $\Xi$ and double-$\Lambda$ hypernuclei using a $^7\mathrm{Li}$ target; in decay of $^{\,7}_{\Xi}\mathrm{H}$, which can be populated in the $^7\mathrm{Li}(K^-,K^+)$ reaction, ${}^{\ \ \ 5}_{\Lambda\Lambda}{\mathrm{H}}$ may be formed. The lightest double-$\Lambda$ hypernucleus is considered to be ${}^{\ \ \ 5}_{\Lambda\Lambda}{\mathrm{H}}$, according to many theoretical calculations, but it is yet to be discovered experimentally.
In this contribution, the overview of the $S=-2$ experiments at J-PARC is shown, with an emphasis on the E75 experiment.
| speaker affiliation | Tokyo Institute of Technology |
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