Evidence of a slight nuclear transparency in the alpha-nucleus systems - Chamon, Luiz Carlos; Nobre, G. P. A.; Rossi, E. S., Jr.; deBoer, R. J.; Seymour, C.; Wiescher, M.; Kiss, G. G.; Gasques, Leandro Romero (JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS, 2015)