Reçu le 9 mai 1968.)Résumé. 2014 Nous avons tracé par la méthode des coïncidences plusieurs spectres continus provenant de la réaction séquentielle p + 11B = 12C*= 03B1 + 8Be* ; 8Be* = 03B1 + 03B1 à 1,4 MeV. Nous pouvons expliquer quantitativement ces spectres avec une largeur constante pour le 8Be* si nous introduisons un terme d'interférence. Les événements pour lesquels une particule 03B1 a une énergie nulle sont interdits.Abstract. 2014 We have measured several coincidence spectra coming from the sequential reaction p + 11B = 12C* = 03B1 + 8Be* ; 8Be* = 03B1 + 03B1 at 1.4 MeV. We can explain these spectra quantitatively with a constant width of 8Be* if we introduce an interference term. The events in which an 03B1-particle has zero energy are forbidden.
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