Article révisé par les pairs
Résumé : A study is presented of single πo production in neutrino and antineutrino interactions in Gargamelle filled with freon CF3Br. Limits on the neutral to charged current cross-section ratios Rv=σ(vN→vN′πo)/2 σ(vN→ μ -N′πo) and Rν = σ(νN → νN′πo)/2 σ(νN → ω+N′πo) are found to be 0.10 < Rν < 0.20 and 0.26 < Rν < 0.44 at 68% confidence level. © 1975.