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- The dependence of the anomalous J/psi suppression on the number of participant nucleonsPublication . M. C. Abreu; Alessandro, B.; Alexa, C.; Arnaldi, R.; Atayan, M.; Baglin, C.; Baldit, A.; Bedjidian, M.; Beole, S.; Boldea, V.; Bordalo, P.; Borges, G.; Bussiere, A.; Capelli, L.; Castor, J.; Castanier, C.; Chaurand, B.; Chevrot, I; Cheynis, B; Chiavassa, E; Cicalo, C; Claudino, T; Comets, M. P.; Constans, N.; Constantinescu, S.; Cortese, P.; De Marco, N.; De Falco, A.; Dellacasa, G.; Devaux, A.; Dita, S.; Drapier, O.; Ducroux, L.; Espagnon, B.; Fargeix, J.; Force, P.; Grigorian, A. A.; Grigorian, S.; Grossiord, J. Y.; Guber, F. F.; Guichard, A.; Gulkanyan, H.; Hakobyan, R.; Haroutunian, R.; Idzik, M.; Jouan, D.; Karavitcheva, T. L.; Kluberg, L.; Kurepin, A. B.; Le Bornec, Y.; Lourenco, C.; Macciotta, P.; Mac Cormick, M.; Marzari-Chiesa, A.; Masera, M.; Masoni, A.; Monteno, M.; Musso, A.; Petiau, P.; Piccotti, A.; Pizzi, J. R.; Prino, F.; Puddu, G.; Quintans, C.; Ramos, S.; Ramello, L.; Mendes, P. R.; Riccati, L.; Romana, A.; Santos, H.; Saturnini, P.; Scalas, E.; Scomparin, E.; Serci, S.; Shahoyan, R.; Sigaudo, F.; Silva, S.; Sitta, M.; Sonderegger, P.; Tarrago, X.; Topilskaya, N. S.; Usai, G. L.; Vercellin, E.; Villatte, L.; Willis, N.The observation of an anomalous J/psi suppression in Pb-Pb collisions by the NA50 Collaboration can be considered as the most striking indication for the deconfinement of quarks and gluons at SPS energies. In this Letter, we determine the J/psi suppression pattern as a function of the forward hadronic energy E-ZDC measured in a Zero Degree Calorimeter (ZDC). The direct connection between EZDC and the geometry of the collision allows us to calculate, within a Glauber approach, the precise relation between the number of participant nucleons N-part and E-ZDC. Then, we check if the experimental data can be better explained by a sudden or a smooth onset of the anomalous J/psi suppression as a function of the number of participants. (C) 2001 Elsevier Science B.V. All rights reserved.