Have QuasinuclearNN¯Bound States Been Discovered?

It is suggested that a broad structure $X^0\mathrm{}\left(1480\right)\mathrm{}$ recently observed in the reaction $\overline{p}n\to {\pi }^{-}{X}^0\to 3{\pi }^{-}2{\pi }^{+}$ may be interpretable in terms of an unstable quasinuclear bound state of the (complex) nucleon-antinucleon ($N\overline{N}$) potential. The observed mass, production branching ratio, and preference for the $X^0\to {\rho }^0{\rho }^0$ rather than ${\pi }^{+}{\pi }^{-}$ decay mode are consistent with a quantum-number assignment $J^{\mathrm{PC}}\left(I^G\right)=2^{++}\left(0^{+}\right)$. Prospects for finding the lower-lying $0^{++}$($0^{+}$) and $1^{--}$($0^{-}$) members of the expected natural-parity quasinuclear band are discussed.