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Study of $$Xi$$-$$^{14}$$N interaction by measurement of twin hypernuclei with hybrid emulsion method at J-PARC

Hayakawa, Shuhei; Yoshida, Junya

The studies of hyperon-nucleon and hyperon-hyperon interactions are necessary for the understanding of general baryon-baryon interaction. Even in the $$S$$ = -1 sector such as $${Lambda}N$$ and $${Sigma}N$$, the available data is limited. As for the $$S$$ = -2 sector such as $$LambdaLambda$$ and $${Xi}N$$, there are few experimental data. The J-PARC E07 experiment was performed to investigate $$S$$ = -2 hypernuclei at J-PARC K1.8 beam line. Using a K- meson beam with the momentum of 1.81 GeV/c, $$Xi$$- hyperons are produced in the quasi-free $$p(K^{-}$$, K$$^{+})$$$$Xi$$- reaction at a diamond target. A method using combined information between two spectrometers and nuclear emulsion, called hybrid emulsion method, was conducted by using silicon-strip detectors and one hundred eighteen emulsion modules. A twin $$Lambda$$ hypernuclear event, named IBUKI event, was observed with a newly developed scanning system. At the $$Xi$$- capture point, two $$Lambda$$ hypernuclei of $$^{10}$$$$_{Lambda}$$Be and $$^{5}$$$$_{Lambda}$$He were the most likely to be produced by the conservation laws of energy and momentum. The reaction process of the IBUKI event was identified as $$Xi$$- + $$^{14}$$N $$rightarrow$$ $$^{10}$$$$_{Lambda}$$Be + $$^{5}$$$$_{Lambda}$$He. The binding energy of $$Xi$$- + $$^{14}$$N system was determined to be 1.27 $$pm$$ 0.21 MeV. From the consideration of an excited state, the energy level for $$^{10}$$$$_{Lambda}$$Be was interpreted to be the ground state (2-) or the other state of the spin doublet (1-). The IBUKI event was the first event whose binding energy was determined with a little ambiguity. The binding energy indicates a bound state of the $$Xi$$-$$^{14}$$N system by an attractive $${Xi}N$$ interaction. In this talk, we would like to report the above result of the IBUKI event.

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