Method for Determining theK0Spin

A method is presented for determining the $K^0$ spin, using only angular momentum conservation and the rules of quantum mechanics. The method is based on a proof that, in the reaction ${\pi }^{-}+p\to \Lambda +K^0$, the ${K_1}^0$ decay intensity associated with a given direction of the $\Lambda$ spin cannot be isotropic at any production angle, if the $K^0$ spin is equal to or greater than two.