1,263 research outputs found
Cosmic multi-muon bundles measured at DELPHI
The DELPHI detector at LEP, located 100 underground, has been used to
detect the multi-muon bundles by cathode readout of its hadron calorimeter and
its tracking detectors (TPC, muon chambers). The experimental apparatus allows
us to study muon bundles originating from primary cosmic particles with
energies in the interval - .
The cosmic events registered during the years 1999 and 2000 correspond
roughly to of effective run time.
The aim of the work is to compare the measured muon multiplicity
distributions and predictions of high energy interaction models for different
types of primary particles and also to determine the absolute flux of events in
certain muon multiplicity range. The presentation describes the current status
of the analysis.Comment: 2 pages, 1 figure, presented at XXXVIIth Rencontres de Moriond
Electroweak Interactions and Unified Theories 2002 (Young Scientists Forum
Detection of high-energy muons in cosmic ray showers
The DELPHI detector located at LEP accelerator has been used to measure multi-muon bundles originated from cosmic ray interactions. Two subdetectors - Hadron Calorimeter and Time Projection Chamber, are used for this purpose. The 1999 and 2000 data are analyzed over wide range of muon multiplicities. The muon multiplicity distribution is compared with prediction of Monte-Carlo simulation based on CORSIKA/QGSJET. The Monte-Carlo does not describe the large multiplicity part of data. Even the extreme assumption on the cosmic ray composition (pure iron nuclei) hardly predicts number of high multiplicity events comparable with the data. The impact of QGSJET internal parameters onto the result is also studied
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