First observation of a nuclear $s$-state of $\Xi$ hypernucleus, ${}_{\Xi }^{15}\mathrm{C}$

M. Yoshimoto, J. K. Ahn, B. Bassalleck +46

Bound-systems of ${\Xi }^{-}$--${}_{}^{14}\mathrm{N}$ are studied via ${\Xi }^{-}$ capture at rest followed by emission of a twin single-$\Lambda$ hypernucleus in the emulsion detectors. Two events forming…