NeuLAND - FAIR

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Figure 8.1.: Distribution of proton polar angles θ for both protons from the quasifreescattering reaction for deuteron on proton at 250 AMeV (left panel) and 1015 AMeV (right panel). Figure 8.2.: Spatial distribution of neutrons from quasifree scattering of deuterons at 250 AMeV on protons in 10 m distance to the target. 82
Figure 8.3.: ToF distribution in 10 m distance from the target for neutrons stemming from the quasifree breakup of deuterons on protons at 1500 AMeV. nontrivial task. We are missing a reference measurement telling us event-by-event the energy of the neutron. When using the quasifree-scattering reaction at high beam energies (approximately 1500 MeV) nevertheless the neutrons can be viewed as nearly monoenergetic. Figure 8.3 shows exemplarily the time-of-flight (ToF) distribution of the neutrons from the quasifree-scattering of deuterium on proton at 1500 AMeV in 10 m distance to the target. The observed width of about 200 ps results from the intrinsic momentum distribution of the knocked-out proton in the deuteron. For a distance of 5 m from the target, the width of the ToF distribution will thus be approximately 100 ps. First, from a measurement at two distances to the target using the existing LAND we can disentangle the contribution from the ToF resolution of the detector and the width related to the wave function of the deuteron. Measurements will be performed in addition with a Carbon target in order to quantitatively understand background stemming from reactions with C-nuclei in the CH2 target which survive the kinematics conditions of the quasifree breakup. From earlier measurements we know that this background is contributing on a 10% level only. Second, after the width of the neutron momentum distribution after breakup is determined as described above, we can derive the time resolution from measurements on the subset of NeuLAND submodules which aim to be of the order of ≤ 150 ps. 2. NeuLAND submodules efficiencies: The second important quantity to study for the NeuLAND submodules is their efficiency as a function of beam energy. We aim to measure at 5 energies, namely at 200, 300, 500, 800, and 1500 MeV, thus providing excellent benchmark data for further detailed simulations. 83
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FAIR/NUSTAR/R 3 B/TDR NeuLAND Techn
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Germany EMMI and FIAS: Enrico Fiori
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INR Moscow: Alexander Botvina Russi
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Contents Executive Summary 11 1. In
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B.7. MRPC Solution using Glass as C
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Apart from the excellent energy res
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processes in the universe, such as
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decaying into 24 O plus 4 neutrons
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2. Physics Scenarios: Requirements
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e studied at R 3 B at FAIR include
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all theoretical calculations predic
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at the surface of the nucleus. The
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the evolution of fission channels (
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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 and 40: GEANT3 interface. Here, we compare
Page 41 and 42: Counts 1000 900 800 700 600 500 400
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: 8. Calibration 8.1. Calibration wit
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
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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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