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

Abstract

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$\to {}_{\Lambda }^{10}$Be + ${}_{\Lambda }^5$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 $\Xi N$-$\Lambda \Lambda$ coupling.

References in corpus (1)

• Mean field approaches for ${\Xi }^{-}$ hypernuclei and current experimental data

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