L. Pierre-auger-5, . Propagation, . Des, and . Chargées, PHÉNOMÉNOLOGIE FIG. 5.28 : Moyennes sur les réalisations de sources du spectre de l'ensemble des éléments (ligne noire) et des spectres par groupes d'éléments dans le cas d'une injection mixte. Pour les particules plus lourdes que les nucléons, les groupes suivants sont définis : "éléments légers

A. Si, (noir) : 25 ? A ? 40, "groupe du fer" (jaune) : 41 ? A ? 56 Gauche : injection ? E ?2.2 en l'absence de déflections, Droite : injection ? E ?2.6 avec déflections substantielles. Les fluctuations statistiques importantes sont dues à des limitations de CPU

L. Fig, 28 présente les spectres par groupes d'éléments dans ces deux situations Les deux hypothèses, bien que physiquement très différentes, mènent à des observables similaires. La fraction de protons à 10 19 eV dans le premier cas est de 58%, et de 63% dans le second cas. Nous pouvons comparer ces résultats avec le cas de l'injection de protons seuls. Dans ce cas, l'indice spectral d'injection doit être environ 2

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