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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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5 11 2004 cbm russia meeting itep moscow

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


Weizsacker williams method of equivalent quanta
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


Forward emission of neutrons reldis predictions
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 !


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




Energy spectra of the neutron calorimeter in proton and Pb runs

1n

ADC spectrum for 30 GeV protons

2n

3n



Calculated and measured 1n and 2n emission in dissociation of 30gev pb ion al cu sn and pb targets
Calculated and measured 1n and 2n emission in dissociation of 30GeV Pb ion Al,Cu,Sn,and Pb targets


Latest ALICE-lumi data: of 30GeV Pb ion Al,Cu,Sn,and Pb targetsforward neutron emission measurements for 158 A GeV In ions @ CERN SPS

1n

2n

3n

4n


Neutron calorimeter of 30GeV Pb ion Al,Cu,Sn,and Pb targets


Castor prototype
CASTOR PROTOTYPE of 30GeV Pb ion Al,Cu,Sn,and Pb targets


Castor prototype1
CASTOR PROTOTYPE of 30GeV Pb ion Al,Cu,Sn,and Pb targets


Estimations of particle density in the hole of cbm ecal for central urqmd au au 25agev
Estimations of particle density in the hole of CBM ECAL of 30GeV Pb ion Al,Cu,Sn,and Pb targetsfor central UrQMD Au+Au 25AGeV

neutrons

protons

electrons

gammas

pions


Charmonium Feasibility studies: of 30GeV Pb ion Al,Cu,Sn,and Pb targetsInvariant 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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