NeuLAND - FAIR

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Figure 4.4.: Display of simulated neutron events at 470 MeV hitting the existing LAND detector. Tracks of neutrons (blue), gamma-rays (green), and protons (red) are visible. The upper left figure details the modularity of LAND. The upper right display shows an inelastic scattering event leading to one fast proton. The lower left plot displays an inelastic scattering event as well, but here low energy protons are produced. The lower right figure shows a typical case of emission of slow neutrons after excitation of an iron nucleus. 40
Counts 1000 900 800 700 600 500 400 300 200 100 0 -40 -20 0 20 40 x position (cm) Counts 1000 900 800 700 600 500 400 300 200 100 0 -100 -80 -60 -40 -20 z position (cm) 0 20 Figure 4.5.: Simulation of the error in determination of the first interaction point in x (left) and z position (right) for 470 MeV neutrons in LAND. neutron energy simulated eff. GEANT3 simulated eff.GEANT4 measured (MeV) (%) (%) (%) 270 80 88 85(7) 470 92 93 93(2) 600 96 95 94(1) 800 97 96 96(1) 1050 98 98 96(1) Table 4.2.: Efficiencies for the neutron detection with LAND simulated with GEANT3 and GEANT4 are compared to the measured values from a calibration experiment [Bor-03]. one set of parameters the variation of spectra with the neutron beam energy are well described by the GEANT3 simulations. The largest deviations can be seen for the lowest neutron energy of 170 MeV. For the detailed response and resolution studies laid out in section 4.5, we decided to use primarily the R 3 BRoot framework, since it can be used in a later stage for an identical treatment of simulated and real data. The GEANT3 interface was selected for practical reasons. 41
Page 1 and 2: FAIR/NUSTAR/R 3 B/TDR NeuLAND Techn
Page 3 and 4: Germany EMMI and FIAS: Enrico Fiori
Page 5 and 6: INR Moscow: Alexander Botvina Russi
Page 7 and 8: Contents Executive Summary 11 1. In
Page 9: B.7. MRPC Solution using Glass as C
Page 12 and 13: Apart from the excellent energy res
Page 14 and 15: processes in the universe, such as
Page 16 and 17: decaying into 24 O plus 4 neutrons
Page 19 and 20: 2. Physics Scenarios: Requirements
Page 21 and 22: e studied at R 3 B at FAIR include
Page 23 and 24: all theoretical calculations predic
Page 25 and 26: at the surface of the nucleus. The
Page 27 and 28: the evolution of fission channels (
Page 29 and 30: 3. Summary of NeuLAND Prototype Res
Page 31 and 32: counts 70 60 50 40 30 20 10 0 15 15
Page 33 and 34: Figure 3.4.: Shown is the time reso
Page 35 and 36: 4. Monte Carlo Simulations Within t
Page 37 and 38: normalized counts normalized counts
Page 39: GEANT3 interface. Here, we compare
Page 43 and 44: counts 5 10 4 10 3 10 2 10 10 LAND
Page 45 and 46: incident neutron fully active detec
Page 47 and 48: investigated. Three values for the
Page 49 and 50: spectrum, absorption length, refrac
Page 51 and 52: Counts 600 500 400 300 200 100 with
Page 53 and 54: Since, as discussed above, several
Page 55 and 56: events 800 600 400 200 0 0 200 400
Page 57 and 58: clusters N 100 50 0 0 500 1000 1500
Page 59 and 60: In the following section we discuss
Page 61 and 62: events 15000 10000 5000 input outpu
Page 63 and 64: events 2000 1500 1000 500 σ = 15 k
Page 65 and 66: 5. Technical Specifications and Des
Page 67 and 68: construction, or for subsequent rep
Page 69 and 70: positioning of 50 submodules mounti
Page 71 and 72: Figure 5.6.: Detector frame with fi
Page 73 and 74: 5.4. Peripheral Systems 5.4.1. Read
Page 75 and 76: Figure 5.12.: The photo shows the T
Page 77: 6. Radiation Environment and Safety
Page 81 and 82: 8. Calibration 8.1. Calibration wit
Page 83 and 84: Figure 8.3.: ToF distribution in 10
Page 85: Figure 8.4.: Event display for seve
Page 89 and 90: 10. Installation procedure, its Tim
Page 91:
11. Cost and Funding 11.1. Cost Est
Page 94 and 95:
The timeline for milestone 1 includ
Page 96 and 97:
96 2. Sample Tests Random samples o
Page 98 and 99:
PNPI St. Petersburg: G.D. Alkhazov,
Page 100 and 101:
HV 1.$ mm 2$ mm 0+$1-2)-2'.%/ 5%4'.
Page 102 and 103:
Beamline Be exit window P 6 P 3 P 4
Page 104 and 105:
B.3. Design Issues Addressed with 4
Page 106 and 107:
Time [ns] Counts 41 40 39 2200 2000
Page 108 and 109:
Efficiency 100 80 60 40 20 0 7.5 8
Page 110 and 111:
200 AMeV, Erel = 100 keV emitted %
Page 112 and 113:
B.7. MRPC Solution using Glass as C
Page 114 and 115:
114
Page 116 and 117:
[Bot-04] S. Botvina andI.N. Mishust
Page 118 and 119:
[Lip-03] C. Lippmann, PhD Thesis, U
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NeuLAND - FAIR

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