a design study for a cobra upgrade to - Institut für Kern- und ...

x Contents
4.1.2 Scintillation process . . . . . . . . . . . . . . . . . 27
4.1.3 Scintillating materials . . . . . . . . . . . . . . . . 37
4.2 Detector assembly . . . . . . . . . . . . . . . . . . . . . . . 41
4.2.1 Electronic readout devices . . . . . . . . . . . . . . 41
4.2.2 Detector mounting . . . . . . . . . . . . . . . . . . 44
4.2.3 Energy resolution . . . . . . . . . . . . . . . . . . . 48
5 Scintillator upgrade 51
5.1 Monte Carlo studies for the upgrade design . . . . . . . . 52
5.1.1 Scintillator size . . . . . . . . . . . . . . . . . . . . 52
5.1.2 Price research . . . . . . . . . . . . . . . . . . . . . 55
5.1.3 Electronic readout . . . . . . . . . . . . . . . . . . 57
5.2 The design . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
5.3 Monte Carlo studies of the designed upgrade . . . . . . . 65
5.3.1 Implementation of CsI detectors in Venom . . . . 67
5.3.2 2νββ signal . . . . . . . . . . . . . . . . . . . . . . 69
5.3.3 Background contamination in CsI crystal . . . . . 73
5.3.4 Background contamination in PMT, paint and
Nest gas . . . . . . . . . . . . . . . . . . . . . . . . 82
6 Summary and future work 85
A FIRST APPENDIX 87
A.1 Scintillator matrials . . . . . . . . . . . . . . . . . . . . . . 87