Evaporation effects in the one-body dissipation mechanism

Although the one-body dissipation mechanism has been successfully applied t o the description of nuclear reactions, recent calculations suggest that qu antum localization should completely suppress this dissipation mechanism. T he particle evaporation process was not taken into account in those calcula tions. We show, through Fermi accelerator simulations, that this mechanism is a source of decoherence in the quantum dynamics of the system. This lead s to a strong hindrance of quantum localization, and, as a consequence, to dissipation of collective energy. (C) 2001 Elsevier Science B.V. All rights reserved.