The unambiguous discovery in both production and decay was by BARNES 1964 . The quantum numbers follow from the assignment of the particle to the baryon decuplet. DEUTSCHMANN 1978 and BAUBILLIER 1978 rule out $\mathit J = 1/2$ and find consistency with $\mathit J = 3/2$. AUBERT,BE 2006 finds from the decay angular distributions of ${{\mathit \Xi}_{{{c}}}^{0}}$ $\rightarrow$ ${{\mathit \Omega}^{-}}{{\mathit K}^{+}}$ and ${{\mathit \Omega}_{{{c}}}^{0}}$ $\rightarrow$ ${{\mathit \Omega}^{-}}{{\mathit K}^{+}}$ that $\mathit J = 3/2$; this depends on the spins of the ${{\mathit \Xi}_{{{c}}}^{0}}$ and ${{\mathit \Omega}_{{{c}}}^{0}}$ being $\mathit J = 1/2$, their supposed values. ABLIKIM 2021E determines the ${{\mathit \Omega}^{-}}$ spin to be $\mathit J = 3/2$ from the decay angular distributions of the complete decay chain ${{\mathit \psi}{(3686)}}$ $\rightarrow$ ${{\mathit \Omega}^{-}}{{\overline{\mathit \Omega}}^{+}}$ , with subsequent decays ${{\mathit \Omega}^{-}}$ $\rightarrow$ ${{\mathit K}^{-}}{{\mathit \Lambda}}$ and ${{\overline{\mathit \Omega}}^{+}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\overline{\mathit \Lambda}}}$ . We have omitted some results that have been superseded by later experiments. See our earlier editions.