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Observation of Coulomb-assisted nuclear bound state of $$Xi^-$$-$$^{14}$$N system

Hayakawa, Shuhei; Fujita, Manami; Hasegawa, Shoichi  ; Hashimoto, Tadashi  ; Hosomi, Kenji ; Ichikawa, Yudai ; Imai, Kenichi*; Nanamura, Takuya; Naruki, Megumi; Sako, Hiroyuki  ; Sato, Susumu ; Tamura, Hirokazu; Tanida, Kiyoshi  ; Yamamoto, Takeshi ; 84 of others*

In an emulsion-counter hybrid experiment performed at J-PARC, a $$Xi^-$$ absorption event was observed which decayed into twin single-$$Lambda$$ hypernuclei. Kinematic calculations enabled a unique identification of the reaction process as $$Xi^{-} + ^{14}$$N$$ rightarrow ^{10}_Lambda$$Be + $$^5_Lambda$$He. For the binding energy of the $$Xi^{-}$$ hyperon in the $$Xi^-$$-$$^{14}$$N system a value of $$1.27 pm 0.21$$ MeV was deduced. The energy level of $$Xi^-$$ is likely a nuclear $$1p$$ state which indicates a weak $${Xi}N$$-$$LambdaLambda$$ coupling.

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Category:Physics, Multidisciplinary

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