Geant4 Simulations for the Radon Electric Dipole Moment Search at

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200 2 χ red = 1.001 f = 2.0010(2) Hz Counts 3400 3200 3000 2800 2600 0 5 10 15 20 25 30 Seconds (500ms Time Bins) Counts 150 100 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Seconds (20ms Time Bins) Figure 4.14: The fit of the 565 keV to 614 keV energy gate time projection for two anti-parallel BrilLanCe 380 LaBr 3 (Ce) detectors. Figure 4.4(a). The figure shows that not all individual photopeaks are resolved with the LaBr 3 (Ce) detectors. Figure 4.14 illustrates the time projection and fit of a gate set between 565 and 614 keV. Although the gate encompasses many photopeaks the frequency signal is still clearly visible and further exploration of the use of the highrate capabilities of LaBr 3 (Ce) scintillators in the RnEDM experiment is warranted. 78
Chapter 5 Conclusions and Future Directions 5.1 Conclusions The Geant4 simulations presented in this work accurately describe the physics involved in the RnEDM experiment at TRIUMF. The radioactive decay simulation package developed as part of this thesis is capable of simulating any β-decaying nucleus given the half-life, the β-decay branching ratio to the ground state, Q-value, daughter level spins and parities, γ-ray energies, intensities, mixing ratios, internal conversion coefficients, and the resulting X-ray energies and intensities. Along with reproducing the entire decay scheme and realistic β, γ, electron and X-ray energies and probabilities, the package also simulates the angular distribution of the emitted β particles and γ rays. This is a highly versatile radioactive decay simulation package that will find many applications, not only in further studies of the RnEDM experiment, but also the entire decay spectroscopy research program with GRIF- FIN at ISAC. The RnEDM apparatus (cell, oven, magnet and µMetal shielding) was included in Geant4 to realistically simulate the γ-ray scattering and backgrounds present in the experimental apparatus. The GRIFFIN γ-ray spectrometer (based on 79
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GEANT4 SIMULATIONS FOR THE RADON EL
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Dictated but not read. i
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Contents Acknowledgements ii 1 Intr
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4 Results 60 4.1 γ-Ray Spectroscop
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List of Figures 1.1 An illustration
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Chapter 1 Introduction Thesearchfor
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ˆP ր ˆT ց Figure 1.1: An illust
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1.1.1 CP Violation Following the ob
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Figure 1.2: Experimental upper limi
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Figure 1.3: Illustration of the dou
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Chapter 2 RnEDM Experiment at TRIUM
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Figure 2.1: A schematic of the ISAC
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a measurement cell. The RnEDM exper
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NMR techniques, and supplementing s
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Occupied Orbitals Fine Structure Hy
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energy levels are separated accordi
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(σ + ) along the axis of the B fie
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atom and absorbed by another. Radia
Page 37 and 38: anaverageof120kHzphotopeakcountrate
Page 39 and 40: Figure 2.7: One GRIFFIN/TIGRESS HPG
Page 41 and 42: (a) One GRIFFIN detector in the HPG
Page 43 and 44: 3.1 Introduction 3.1.1 Previous Wor
Page 45 and 46: energies, branching ratios, emissio
Page 47 and 48: used around the measurement cell in
Page 49 and 50: 3.2.5 Simulated Data Thecodewaswrit
Page 51 and 52: lower its total energy. Internal co
Page 53 and 54: 10000 1000 2 χ red = 1.21 t 1/2 =
Page 55 and 56: as [47] I(E) = G 2π 3 7 c 6 | M i
Page 57 and 58: was to use an average X-ray energy
Page 59 and 60: 1.5 1.4 1.3 1.2 P = 100% P = 75% P
Page 61 and 62: where (a b c d | e f) are Clebsch-G
Page 63 and 64: 2 2 1.5 J i = 5/2, J f = 5/2 J i =
Page 65 and 66: of radius 10 cm, allowing the GRIFF
Page 67 and 68: (a) Screenshot showing the detector
Page 69 and 70: 3.6.2 Output Data and Sort Codes Th
Page 71 and 72: (user-defined option), secondly toa
Page 73 and 74: 30 Absolute Efficiency (%) 25 20 15
Page 75 and 76: 11 10 9 8 7 6 5 4 3 2 1 0 1e+06 Cou
Page 77 and 78: 4.2.1 Multipolarity Effects The sha
Page 79 and 80: Figure 4.7: The time projections an
Page 81 and 82: distribution, this average intensit
Page 83 and 84: Table 4.1: The fit results for the
Page 85 and 86: 12 10 linear regression: y = 0.2243
Page 87: 15 Linear Counts (e+04) 10 5 0 1e+0
Page 91 and 92: simulated given sufficient parent a
Page 93 and 94: Appendix A Figure A.1: Simulated de
Page 95 and 96: Figure A.3: Simulated decay scheme
Page 97 and 98: Figure A.5: Simulated decay scheme
Page 99 and 100: 6 out = (1/(1+∆ˆ2))*(f(k,jf,L1,L
Page 101 and 102: 44 return; 45 end 46 if abs(m) > j
Page 103 and 104: 1 % LegendreP.m 2 function P = Lege
Page 105 and 106: 39 xx(i+1,j+1) = r(i+1,1)*sin((i*re
Page 107 and 108: 11 %warning('m1 + m2 + m3 must equa
Page 109 and 110: 23 end 24 % ////////// 25 j1 = J1;
Page 111 and 112: 33 if L1 == L2 && ∆ == 0 34 title
Page 113 and 114: Bibliography [1] J. M. Pendlebury a
Page 115 and 116: [25] P. G. Bricault, M. Dombsky, Je
Page 117: [47] RichardA.Dunlap. An introducti
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