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Humboldt-Universität zu Berlin - Mathematisch-Naturwissen­schaft­liche Fakultät - Experimentelle Elementarteilchenphysik

Andreas Korn (1998)

Cosmic Muons in the L3 Detector

Diplom Thesis, Humboldt Universität zu Berlin.

The L3+Cosmics experiment is an extension of the L3 detector. This detec-
tor is situated at the LEP accelerator ring at CERN in Geneva. It is located
underground at 52 m depth.
    The large magnetic spectrometer is used to measure cosmic muons.
    This spectrometer has a volume of 1000m3 and achieves a resolution of 2.5
% for 45 GeV muons. This properties allow a precision which is a factor of ten
better than previous experiments of the muon spectrum. An additional detector
is needed to obtain the arrival time of the particles. This detector consist of
scintillation counters placed on top of the magnet.
    The installation will take place in two steps. In the rst phase a scintillator
area of 48m2 and later 72m2 is installed on top of the magnets. The experiment
starts in phase I with a quarter of the spectrometer.
    Phase II extends the scintillator coverage to three times the nal area of phase
I. The full spectrometer is used for phase II.
    Cosmic muons originate in air showers. The showers are induced by cosmic
primary particles in interactions with the atmosphere. Analysing these muons
allows to study the underlying interaction processes.
    In this work the simulation of the L3+Cosmics experiment is described. Pro-
grams for muon generation, air shower simulation, tracking through the earth
layer above the detector and simulating events in the apparatus are introduced.
    A result obtained with these programs is the acceptance. Phase I of the
experiment corresponds to an e ective area of 2:67 0:08 m2. This increases to
42:4 0:7 m2 for phase II. Studies of multi muons indicate a possibility to measure
the primary composition of cosmic rays.