New results from the DREAM project

The Dual REAdout Method (DREAM) allows to improve the performance of hadronic calorimeters by measuring on an event-by-event basis the electromagnetic fraction of the hadronic cascade, thus reducing the effect of its fluctuation and obtaining a better resolution and linearity. The method is based on the separation of the scintillation light due to ionization from Cherenkov light produced almost exclusively by relativistic particles, i.e. the electromagnetic component of the hadronic shower. The DREAM method has been applied to both a fiber calorimeter and homogeneous media (crystals). Moreover, with this same technique the neutron fraction can be measured, therefore reducing also the effect of the fluctuations in the invisible energy in sampling calorimeters.