Evidence for Double Production ofV0Particles

An example of the double production of $V^0$ particles is described and interpreted as evidence for the process: ${\pi }^{-}+p\to {\Lambda }^0+{\theta }^0$. The ${\Lambda }^0$ and ${\theta }^0$ are well identified from analysis of their decays in the chamber, from which $Q\left({\Lambda }^0\right)=37\mathrm{}\pm 4$ Mev and $Q\left({\theta }^0\right)=223\mathrm{}\pm 10$ Mev. The nature of the incident particle is suggested by calculation of its mass from the observed $V^0$-particle momenta.