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86 6 Summary and future work dimensions. Therefore, the event position reconstruction for the CsI crystals should be investigated and implemented into the Venom simulation. A background reduction for events with only one involved CZT and CsI detector, being the majority of all coincident events, but providing no angle information, should be investigated further. The resolutions of the CZT and CsI:Tl detectors should be adjusted for following more detailed studies. For this thesis, the CZT resolution used in the analysis of Heine [54] was used and is expected to be larger than the resolution of the new installed 64 CZT crystals with colourless passivation. The position dependent resolution of the CsI:Tl crystals should be determined for both crystals sizes with semiconductor readout. The achievable half-life limits with a CsI:Tl COBRA upgrade has to be studied in a more detailed analysis. Additionally, a future investigation of an upgrade should study CWO, comparing achievable half-life limits and prices with a CsI upgrade. CWO is with its relatively high light yield and easier handling more suitable than NaI:Tl and BGO. To study CWO, the written Geant4 applications can be used, but has to be expanded. The application CsI must be adjusted for CWO. To add new scintillator materials, their optical properties must be implemented. This application can provide information about the possibility of attaching diodes via wavelength shifter to the CWO crystal. Due to the lower maximal emission wavelength of CWO in comparison to CsI:Tl, this might be an option. The VENOM package Scint64 has to be adjusted also. Here, no optical properties must be implemented, but a change of the scintillator material and the geometry for smaller crystals is necessary. The already implemented Birks factor must also be adjusted for CWO. An analysis, using pulse shape discrimination is as well possible for CWO. Further studies with this package could use different resolutions for the two different scintillator sizes or even for individual crystals. A corrected energy, depending on the point of interaction in the scintillator could also be added by later package developers.
Appendix A FIRST APPENDIX In this appendix, an incomplete list about the properties of various scintillating materials is presented in A.1—“Scintillator matrials”. In A.2— “Reports about CsI:Tl detectors” reports about CsI:Tl detectors, concerning the achieved resolutions with different crystal sizes, readout devices and aspects of the detector mounting are listed. A.1 Scintillator matrials Table A.1 shows the properties of various scintillating materials. This list gives an incomplete overview about the obtainable scintillators. 87
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A DESIGN STUDY FOR A COBRA UPGRADE
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I hereby declare that I have create
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vi Abstract
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viii Überblick
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x Contents 4.1.2 Scintillation proc
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xii Contents
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2 1 Introduction The CdZnTe detecto
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4 2 Neutrino physics mass scales no
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6 2 Neutrino physics Ground states
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8 2 Neutrino physics mi: 〈mνe〉
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10 2 Neutrino physics
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12 3 The COBRA experiment CdZnTe (C
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14 3 The COBRA experiment 1420:480:
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16 3 The COBRA experiment Figure 3.
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18 3 The COBRA experiment They are
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20 3 The COBRA experiment Therefore
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22 4 Scintillation detectors search
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24 4 Scintillation detectors Figure
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26 4 Scintillation detectors spectr
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28 4 Scintillation detectors SCINTI
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30 4 Scintillation detectors emissi
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32 4 Scintillation detectors activa
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34 4 Scintillation detectors descri
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Page 64 and 65: 52 5 Scintillator upgrade ergy phys
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Page 100 and 101: 88 A FIRST APPENDIX Scintillator De
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Page 104 and 105: 92 A FIRST APPENDIX trons than a st
Page 106 and 107: 94 B SECOND APPENDIX Figure B.1: Am
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Page 110 and 111: 98 B SECOND APPENDIX B.2 Geant4 Gea
Page 112 and 113: 100 B SECOND APPENDIX Cube, scint64
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Page 116 and 117: 104 Bibliography [13] H. V. Klapdor
Page 118 and 119: 106 Bibliography [43] T. Y. Kim et
Page 120: Typeset September 29, 2010
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