A method to calibrate the light response of a high resolution electromagnetic calorimeter with cosmic rays

Details A method to calibrate the light response of a high resolution electromagnetic calorimeter with cosmic rays A method to calibrate the light response of a high resolution electromagnetic calorimeter with cosmic rays

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988stin...8927631b&link_type=abstract

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Physics

Calibrating, Calorimeters, Cosmic Rays, Crystals, Ionization, Muons, Storage Rings (Particle Accelerators), Amplitude Distribution Analysis, Bismuth Oxides, Electrons, Germanium Oxides, Optical Properties

Scientific paper

In the framework of calibrating and monitoring the energy response of a high resolution electromagnetic calorimeter the different role played by electrons and muons is discussed. A set of relations between the signal amplitudes measured in cosmic ray events and the physical quantities entering in the energy determination is derived. The absolute light yield of the detector can be monitored by the ionization loss of muons of known momentum or by the average ionization of muons with the cosmic ray energy distribution. A method to determine this average ionization in a precise way, using noninteracting pions of known momentum is given. A system to correct the calibration constants for the effect of the variation of the optical properties of each detector element is outlined. It is stressed that precise knowledge of the ionization loss is crucial. This consideration led the L3 collaboration to measure the Bi4Ge3O12 (BGO) ionization loss and verify the agreement with theoretical formulas at the percent level.

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