Article révisé par les pairs
Résumé : A homogeneous sample of 419 π-decays found in nuclear emulsions exposed to the Berkeley Bevatron has been used in the present analysis. Special attention has been given to reducing the effects of the experimental biases both for the scanning and for the analysis. The results show that the π-decay is nearly isotropic, corresponding in the Dalitz treatment to zero spin and negative parity. © 1957 Società Italiana di Fisica.