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Zero Degree and Very Forward Calorimeters for the CBM experiment

5.11.2004 CBM-Russia meeting, ITEP, Moscow. Z. Zero Degree and Very Forward Calorimeters for the CBM experiment. Alexey Kurepin Institute for Nuclear Research, Russian Academy of Science 117312 Moscow, Russia. Weizsacker-Williams method of equivalent quanta.

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Zero Degree and Very Forward Calorimeters for the CBM experiment

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  1. 5.11.2004 CBM-Russia meeting, ITEP, Moscow Z Zero Degree and Very Forward Calorimeters for the CBMexperiment Alexey Kurepin Institute for Nuclear Research, Russian Academy of Science 117312 Moscow, Russia

  2. Weizsacker-Williams method of equivalent quanta Enrico Fermi 1924: “äquivalente strahlung” C.F. Weizsacker and E.J. Williams 1930s: relativistic case Projectile Z P2 Equivalent pulses of radiation = Target Target P1

  3. Forward emission of neutrons – RELDIS predictions Most of the neutrons are emitted with Pt < 0.15 GeV/c - much lower compared to hadronic interactions ! Our detectors at H8 beam line are well suited to detect EMD neutrons !

  4. Schematic view of experimental setup for forward neutron emission measurements for 30 A GeV Pb ions @ CERN SPS S0, S1, SS – plastic scintillator detectors. MBPL and MBPL - Magnets

  5. Energy resolution and response as function of the beam coordinate

  6. Calorimeter response and relative energy resolution as a function of the pion beam energy

  7. Energy spectra of the neutron calorimeter in proton and Pb runs 1n ADC spectrum for 30 GeV protons 2n 3n

  8. Sum of 1n and 2n cross sections is well described by RELDIS

  9. Calculated and measured 1n and 2n emission in dissociation of 30GeV Pb ion Al,Cu,Sn,and Pb targets

  10. Latest ALICE-lumi data:forward neutron emission measurements for 158 A GeV In ions @ CERN SPS 1n 2n 3n 4n

  11. Neutron calorimeter

  12. CASTOR PROTOTYPE

  13. CASTOR PROTOTYPE

  14. Estimations of particle density in the hole of CBM ECAL for central UrQMD Au+Au 25AGeV neutrons protons electrons gammas pions

  15. Charmonium Feasibility studies:Invariant mass spectra for signal (J/Ψ) + di-electron combinatorial background normalized to 1 event. J/Ψ J/Ψ 35 AGeV 25 AGeV Background source • UrQMD central Au+Au events with beam energy 25, 35 AGeV • electrons efficiency 90% • momentum resolution 1% • all electrons with vertex closer than 1 cm to target (very pessimistic estimation) • and Pt>1GeV/c was included into background • pion suppression factor was 10-4 • electrons selected on the TRD3 (Z=815cm) • Simulation conditions • CBMROOT Geant3 transport • Homogeneous magnetic field used in simulation • Dielectron decay of J/ψ was calculated by PLUTO

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