Development of a Liquid Scintillator and of Data ... - Borexino - Infn

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3 The Counting Test Facility (CTF) of Borexino Muon Veto A muon veto was installed consisting of 16 PMTs mounted on the floor of the water tank looking upwards to detect Cerenkov light from muons crossing the water. For the muon veto PMTs a new encapsulation design has been developed by our group which will be used for the Outer Detector in BOREXINO and has been implemented in the CTF as a long-term test [Sei00, Len01]. Fig. 3.6 shows the design of the PMT encapsulation. The PMT distribution has been optimized to detect muons that would produce signals with an energy in the neutrino window. The probability that the muon veto does not trigger on a muon event giving rise to a signal in the energy range of the neutrino window, is 0.8 % [Gri00]. The muon veto PMTs are located on the floor of the water tank on two rings with radius 2.4 m and 4.9 m, respectively. As their distance to the Inner Vessel is much bigger than that of the PMTs mounted on the open structure, as they are not directly looking towards the Inner Vessel and as they don’t have light concentrators, their efficiency to detect scintillation light is substantially reduced compared to the PMTs mounted on the open structure. The trigger threshold of the muon veto is set to 4 photoelectrons. The probability that the muon veto triggers on normal scintillation events in the energy range of the neutrino window has been evaluated in a Monte Carlo simulation to be below 0.5 % for energies in the neutrino window (see fig. 3.7). 44 Figure 3.6: Design of PMT encapsulation for the CTF. The left picture shows the design of the muon veto PMTs for the CTF and BOREXINO. The right picture shows the design of the PMTs used in CTF2.
3.4 The upgraded Counting Test Facility: CTF2 Figure 3.7: Monte Carlo simulation of the muon veto response on scintillation events. In the upper plot the pulse height in the muon veto PMTs is plotted versus the pulse height in the 100 PMTs on the open structure for scintillation events in the energy range 0 - 3 MeV. The pulse height signal in the muon veto PMTs for normal scintillation events in the energy range from 250 - 800 keV is plotted in the lower picture. 45
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Fakultät für Physik der Technisch
Page 4 and 5: Abstract The first chapter contains
Page 6 and 7: Übersicht an Radionukliden in BORE
Page 8 and 9: Contents 3 The Counting Test Facili
Page 10 and 11: Contents viii
Page 12 and 13: 1 Solar Neutrinos Figure 1.1: The p
Page 14 and 15: 1 Solar Neutrinos 1.2 Detection of
Page 16 and 17: 1 Solar Neutrinos With this detecti
Page 18 and 19: 1 Solar Neutrinos 1.2.3 Future Expe
Page 20 and 21: 1 Solar Neutrinos 1.3.2 Astrophysic
Page 22 and 23: 1 Solar Neutrinos Using the unitari
Page 24 and 25: 1 Solar Neutrinos km in the earth.
Page 26 and 27: 1 Solar Neutrinos 16 Solution ¡Ñ
Page 28 and 29: 2 The Borexino Experiment The relat
Page 30 and 31: 2 The Borexino Experiment Figure 2.
Page 32 and 33: 2 The Borexino Experiment 2.2 The D
Page 34 and 35: 2 The Borexino Experiment 2.3 Detec
Page 36 and 37: 2 The Borexino Experiment 2.3.2 Anc
Page 38 and 39: 2 The Borexino Experiment which per
Page 40 and 41: 2 The Borexino Experiment 2.4 Backg
Page 42 and 43: 2 The Borexino Experiment ns; Rn-
Page 44 and 45: 2 The Borexino Experiment volume wo
Page 46 and 47: 3 The Counting Test Facility (CTF)
Page 56 and 57: 4 Position Reconstruction of Scinti
Page 72 and 73: 5 Particle Identification with a Ne
Page 86 and 87: 6 Test of a PXE based scintillator
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6 Test of a PXE based scintillator
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6 Test of a PXE based scintillator
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7 The Source Runs in CTF2 transpare
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7 The Source Runs in CTF2 7.3 The S
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7 The Source Runs in CTF2 102 of th
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7 The Source Runs in CTF2 7.4 Analy
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7 The Source Runs in CTF2 7.4.2 Rec
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7 The Source Runs in CTF2 7.4.3 Ene
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7 The Source Runs in CTF2 45 40 35
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7 The Source Runs in CTF2 112 reemi
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Summary and Outlook possible to dis
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Bibliography [Ade98] E. G. Adelberg
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Bibliography [Bra00] L. De Braeckel
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Bibliography [Lom97] P. Lombardi, D
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Bibliography [Vog96] R. B. Vogelaar
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Development of a Liquid Scintillator and of Data ... - Borexino - Infn

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