Geant4 Simulations for the Radon Electric Dipole Moment Search at

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ABSTRACT GEANT4 SIMULATIONS FOR THE RADON ELECTRIC DIPOLE MOMENT SEARCH AT TRIUMF Evan Thomas Rand University of Guelph, 2011 Advisors: Professor C.E. Svensson The existence ofapermanent electric dipolemoment (EDM) requires theviolation of time-reversal symmetry (T) or, equivalently, the violation of charge conjugation C and parity P (CP). Although no particle EDM has yet been found, current theories beyond the Standard Model, e.g. multiple-Higgs theories, left-right symmetry, and supersymmetry (SUSY), generally predict EDMs within current experimental reach. In fact, present limits on the EDMs of the neutron, electron and 199 Hg atom have significantly reduced the parameter spaces of these models. The measurement of a non-zero EDM would be the first direct measurement of a violation of time-reversal symmetry, and it would represent a clear signal of CP violation from physics beyond the Standard Model. The search for an EDM with radon has an enticing feature. Recent theoretical calculations predict substantial enhancements in the atomic EDMs foratomswithoctupole-deformednuclei, making odd-ARnisotopesprimecandidates for the EDM search. Such measurements require extensive development work and simulation studies. The Geant4 simulations presented here are an essential aspect of these developments. They provide an accurate description of γ-ray scattering and backgrounds in the experimental apparatus and γ-ray detectors, and are being used to study the overall sensitivity of the RnEDM experiment at TRIUMF in Vancouver, B.C.
Dictated but not read. i
Page 1: GEANT4 SIMULATIONS FOR THE RADON EL
Page 5 and 6: Contents Acknowledgements ii 1 Intr
Page 7 and 8: 4 Results 60 4.1 γ-Ray Spectroscop
Page 9 and 10: List of Figures 1.1 An illustration
Page 11 and 12: Chapter 1 Introduction Thesearchfor
Page 13 and 14: ˆP ր ˆT ց Figure 1.1: An illust
Page 15 and 16: 1.1.1 CP Violation Following the ob
Page 17 and 18: Figure 1.2: Experimental upper limi
Page 19 and 20: Figure 1.3: Illustration of the dou
Page 21 and 22: Chapter 2 RnEDM Experiment at TRIUM
Page 23 and 24: Figure 2.1: A schematic of the ISAC
Page 25 and 26: a measurement cell. The RnEDM exper
Page 27 and 28: NMR techniques, and supplementing s
Page 29 and 30: Occupied Orbitals Fine Structure Hy
Page 31 and 32: energy levels are separated accordi
Page 33 and 34: (σ + ) along the axis of the B fie
Page 35 and 36: 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 =
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as [47] I(E) = G 2π 3 7 c 6 | M i
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was to use an average X-ray energy
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1.5 1.4 1.3 1.2 P = 100% P = 75% P
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where (a b c d | e f) are Clebsch-G
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2 2 1.5 J i = 5/2, J f = 5/2 J i =
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of radius 10 cm, allowing the GRIFF
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(a) Screenshot showing the detector
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3.6.2 Output Data and Sort Codes Th
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(user-defined option), secondly toa
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30 Absolute Efficiency (%) 25 20 15
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11 10 9 8 7 6 5 4 3 2 1 0 1e+06 Cou
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4.2.1 Multipolarity Effects The sha
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Figure 4.7: The time projections an
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distribution, this average intensit
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Table 4.1: The fit results for the
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12 10 linear regression: y = 0.2243
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15 Linear Counts (e+04) 10 5 0 1e+0
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Chapter 5 Conclusions and Future Di
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simulated given sufficient parent a
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Appendix A Figure A.1: Simulated de
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Figure A.3: Simulated decay scheme
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Figure A.5: Simulated decay scheme
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6 out = (1/(1+∆ˆ2))*(f(k,jf,L1,L
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44 return; 45 end 46 if abs(m) > j
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1 % LegendreP.m 2 function P = Lege
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39 xx(i+1,j+1) = r(i+1,1)*sin((i*re
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11 %warning('m1 + m2 + m3 must equa
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23 end 24 % ////////// 25 j1 = J1;
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33 if L1 == L2 && ∆ == 0 34 title
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Bibliography [1] J. M. Pendlebury a
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[25] P. G. Bricault, M. Dombsky, Je
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[47] RichardA.Dunlap. An introducti
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