Author/Authors :
Akchurin، نويسنده , , N. and Berntzon، نويسنده , , L. and Cardini، نويسنده , , A. and Ferrari، نويسنده , , R. M. Gaudio، نويسنده , , G. and Hauptman، نويسنده , , J. and Kim، نويسنده , , H. and La Rotonda، نويسنده , , L. and Livan، نويسنده , , M. and Meoni، نويسنده , , E. and Paar، نويسنده , , H. and Penzo، نويسنده , , A. and Pinci، نويسنده , , D. and Policicchio، نويسنده , , A. and Popescu، نويسنده , , S. and Susinno، نويسنده , , G. and Roh، نويسنده , , Y. and Vandelli، نويسنده , , W. and Wigmans، نويسنده , , R.، نويسنده ,
Abstract :
The contributions of neutrons to hadronic signals from the DREAM calorimeter are measured by analyzing the time structure of these signals. The neutrons, which mainly originate from the evaporation stage of nuclear breakup in the hadronic shower development process, contribute through elastic scattering off protons in the plastic scintillating fibers which provide the d E / d x information in this calorimeter. This contribution is characterized by an exponential tail in the pulse shape, with a time constant of ∼ 25 ns . The relative contribution of neutrons to the signals increases with the distance from the shower axis. As expected, the neutrons do not contribute to the DREAM Cherenkov signals.
Keywords :
optical fibers , Neutron signals , Calorimetry , Cherenkov light
