NAL neutrino proposal

Stringent limits on the decays K$0\atop{L}$ → μ⁺μ^-, e⁺e^-, μ^±e^∓

“…12) 'l'he counter was operated in a threshold mode and detected electrons ( the n threshold was higher than the highest n momentum produc~d by K decay). The counter dimensions were 48" .x 48 11 x 100". The gas used was Freon 12 at atmospheric pressure.…”