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Zawartość zarchiwizowana w dniu 2022-12-23

Design of the "shashlik" calorimeter system for the CBM experiment.

Cel

The measurement of short lived vector mesons via their decay into an electron-positron pair provides the unique possibility to study the properties of hadrons in dense baryonic matter. The lepton pair is a "penetrating probe" because it delivers undistorted information on the conditions inside the dense fireball. The invariant masses of the measured lepton pairs permit the reconstruction of the in-medium spectral function of the rho, omega and phi mesons (if they decay inside the medium). Such data is expected to shed light on the fundamental question to what extent chiral symmetry is restored at high baryon densities and how this affects hadron masses. Moreover, the yield of charmonium in heavy-ion collisions is expected to be sensitive to the existence of a deconfined phase of strongly interacting matter. The experimental method to identify charmonium is to measure the invariant mass of its leptonic decay products. Therefore, the experimental task is to unambiguously identify electrons and/or muon in heavy-ion collisions with high particle multiplicities. The aim of the project is to improve the method of electron and muon identification by developing an advanced large-area EM calorimeter based on the "shashlik" technology. The challenge is to reach e-/pi suppression factors between 100 and 1000 in the momentum range between 0.5-20 GeV/c. The innovation as compared to state-of-the-art designs (LHCb) is based on a higher longitudinal granularity of the lead/scintillator stack and a longitudinal segmentation of the modules. The aim is to improve the energy resolution and to optimize the lepton identification capability. The technological challenge is to develop the stamping technology for the production of thin and rigid lead plates and to improve the casting technology for the construction of thin scintillator tiles with high light output and response uniformity. Further goals are the improvement of the time resolution and the muon identification capability. The first step towards the design of such a multifunctional electromagnetic calorimeter is a design study in order to optimize the detector geometry. The simulations will be performed using the event generator URQMD and the transport codes GEANT3/4. The next step is to build a prototype module. Finally, test measurements using electron and pion beams will be performed in order to study the performance of the detector. The results of the simulations will be documented in a progress report end of 2004. The detector design and the test results will be presented in the technical proposal end of 2005. The participating teams are well experienced in performing simulations and detector design and construction. The collaboration has access to the necessary technical infrastructure resources like PC clusters, workshops and beam facilities which is distributed in NIS and INTAS member states. This project is an important contribution for the experimental research program in future heavy-ion physics.

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Koordynator

GSI
Wkład UE
Brak danych
Adres
Planckstrasse 1
64291 Darmstadt
Niemcy

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