May 26 – 30, 2008
Biblioteca Universitaria, Pavia, Italy
Europe/Rome timezone

Estimate of neutrons event-by-event in the DREAM module

Not scheduled
Salone Teresiano (Biblioteca Universitaria, Pavia, Italy)

Salone Teresiano

Biblioteca Universitaria, Pavia, Italy

Strada Nuova, 65
oral presentation New Techniques


Prof. John Hauptman (Iowa State University)


Dual readout calorimetry has so far focussed on the large fluctuations in the
electromagnetic content of hadronic showers (\fem) which degrade the performance in
several respects: poor energy resolution, a non-Gaussian response function, and a
non-linear response with increasing hadron energy. The next largest fluctuation is
the binding energy loss that is proportional to the MeV neutrons liberated in nuclear

These liberated neutrons have velocities about $v \sim 0.05c$ and fill the volume of
the module like a gas. We expect to find the neutron signal in the long-time tails
of the plastic scintillating fibers which record the recoil protons in $np \rightarrow np$ elastic scatters, through which the neutrons rapidly lose kinetic
energy as $\Delta E_n/E_n \approx 1/2$ per elastic scatter. The \dream collaboration
is seeking a means to attain the `ultimate' calorimeter energy resolution, and a
measurement of the neutron content shower-by-shower is one component of that goal.

Primary author

Prof. John Hauptman (Iowa State University)

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