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

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7 The Source Runs in CTF2 7.4.3 Energy Dependence of the Spatial Resolution The approximation of the resolution of the spatial reconstruction for a point-like event is given by ¡Ö Ø Ô ÒÔ where is the speed of light, Ø is the error of one time measurement and ÒÔ is the number of measurements (= number of detected photons). For beta events the Monte Carlo for CTF gives an energy dependence of the spatial resolution as: ¡Ü Ô ÒÔ For gamma events the situation is more complicated: gammas interact in the scintillator mainly due to Compton scattering. Thus they deposit energy at various points in the scintillator in a 108 Figure 7.7: The energy dependence of the spatial resolution. Shown is a Monte Carlo simulation for beta and gamma events, and the data from Bi events from the source run 797. The simulated resolution for beta events follows the expected dependence on Ô ÒÔ. Ñ
7.4 Analysis of the Source Runs short period of time. The event registered by the detector consists of an overlap of these single interactions. The effective position of such an event is the ‘center of light’ of the various energy deposits. A gamma event is hence called an ‘extended event’. The higher the energy of the gamma, the larger the extension of the event. The Monte Carlo for the CTF gives for the energy dependence of the spatial resolution a rather flat curve, after an initial decrease at low energies. The Bi-decay consists of a beta decay to an excited state of Po, followed by the emission of one or more -rays. The energy dependence of the position resolution for these events is shown in fig. 7.7 and compared to the Monte Carlo resolutions for beta and gamma events. The resolution as measured in the CTF2 is worse than predicted by the Monte Carlo, indicating that some effects on the timing are not fully accounted for in the Monte Carlo. 7.4.4 Energy Resolution Ideally, the relative energy resolution should be directly proportional to Ô ÒÔ, where ÒÔ is the number of photoelectrons. The Po alpha events correspond to 950 keV beta equivalent energy, if the scintillator is not quenched. The measured pulse height during the runs 758 - 789 is ( ¦ ) photoelectrons (see fig. 7.8). This gives a relative energy resolution of ¡ Ô ÒÔ For source no. 1 the measured pulse height is ( ¦ ) photoelectrons, leading to ¡ Ô ÒÔ For source no. 2 the measured pulse height is ( ¦ ) photoelectrons, giving ¡ Ô ÒÔ 109
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Fakultät für Physik der Technisch
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Abstract The first chapter contains
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Übersicht an Radionukliden in BORE
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Contents 3 The Counting Test Facili
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Contents viii
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1 Solar Neutrinos Figure 1.1: The p
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1 Solar Neutrinos 1.2 Detection of
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1 Solar Neutrinos With this detecti
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1 Solar Neutrinos 1.2.3 Future Expe
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1 Solar Neutrinos 1.3.2 Astrophysic
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1 Solar Neutrinos Using the unitari
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1 Solar Neutrinos km in the earth.
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1 Solar Neutrinos 16 Solution ¡Ñ
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2 The Borexino Experiment The relat
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2 The Borexino Experiment Figure 2.
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2 The Borexino Experiment 2.2 The D
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2 The Borexino Experiment 2.3 Detec
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2 The Borexino Experiment 2.3.2 Anc
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2 The Borexino Experiment which per
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2 The Borexino Experiment 2.4 Backg
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2 The Borexino Experiment ns; Rn-
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2 The Borexino Experiment volume wo
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3 The Counting Test Facility (CTF)
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4 Position Reconstruction of Scinti
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Page 86 and 87: 6 Test of a PXE based scintillator
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Page 124 and 125: Summary and Outlook possible to dis
Page 126 and 127: Bibliography [Ade98] E. G. Adelberg
Page 128 and 129: Bibliography [Bra00] L. De Braeckel
Page 130 and 131: Bibliography [Lom97] P. Lombardi, D
Page 132 and 133: Bibliography [Vog96] R. B. Vogelaar
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Development of a Liquid Scintillator and of Data ... - Borexino - Infn

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