Effect on a Hadron Shower Leakage on the Energy Response and Resolution of Hadron TILE Calorimeter

摘要

The hadronic shower longitudinal and lateral leakages and its effect on thepion response and energy resolution of iron-scintillator barrel hadronprototype calorimeter with longitudinal tile configuration with a thickness of9.4 nuclear interaction lengths have been investigated. The results are basedon 100 GeV pion beam data at incidence angle $\Theta = 10^o$ at impact point Zin the range from - 36 to 20 cm which were obtained during test beam period inMay 1995 with setup equipped scintillator detector planes placed behind andback of the calorimeter. The fraction of the energy of 100 GeV pions at $\Theta= 10^o$ leaking out at the back of this calorimeter amounts to 1.8 % and agreeswith the one for a conventional iron-scintillator calorimeter. Unexpectedbehaviour of the energy resolution as a function of leakage is observed: 6 %lateral leakage lead to 18 % improving of energy resolution in compare with theshowers without leakage. The measured values of longitudinal punchthroughprobability $(18 \pm 1) %$ and $(20 \pm 1) %$ for two different hit definitionsof leaking events agree with the earlier measurement for our calorimeter andwith the one for a conventional iron-scintillator calorimeter with the samenuclear interaction length thickness respectively. Due to more soft cut for hitdefinition in the leakage detectors the measured value of longitudinalpunchthrough probability more corresponds to the calculated iron equivalentlength $L_{Fe} = 158 cm$.