Résumé : The 19 Ne(p,γ); 20 Na reaction may be of considerable influence for the reaction flow between the CNO and NeNa mass region in high temperature hydrogen burning conditions. The proposed low energy resonance at 0.447 MeV has been measured in inverse kinematics with the Louvain‐la‐Neuve ; 19 Ne beam, using novel activation techniques. An upper limit to the resonance strength has been determined and the implications for the spin assignment of the 2.646 MeV state in 20 Na as well as for the stellar reaction rate are discussed. © ; 1995 American Institute of Physics.