Geant4 Simulations for the Radon Electric Dipole Moment Search at

a fully verified Geant4 framework for the TIGRESS array [35]) was simulated to
the highest degree of reality. The GUGI program was written to allow for a simple
graphical manipulation of the input simulation parameters, allowing the user to
quickly and effectively study many different aspects of the RnEDM simulation. The
entire simulation package provides a powerful tool for further studies of the RnEDM
experiment at TRIUMF.
The RnEDMexperiment will achieve anextremely sensitive measurement that demands
expertise in atomic and nuclear physics alongside advances in technology. The
Geant4 simulations for the RnEDM experiment validate the feasibility of measuring
an atomic EDM using NMR techniques and γ-ray detection. The EDM measurement
of 223 Rn would need a sensitivity on the order 1×10 −26 ecm [27], to be competitive
with the current 199 Hg measurement of d( 199 Hg) ≤ 3.1×10 −29 ecm [19], while taking
advantage of the predicted EDM enhancement factor of ∼ 600 for 223 Rn relative to
199 Hg [2]. The results presented in Chapter 4 show that with 1 × 10 12 photopeak
counts (equivalent to 100 days of counting [32]) detected in the GRIFFIN detectors,
a sensitivity of 4.64×10 −26 ecm would be reached with an electric field of 5 kV/cm
and a spin-decoherence time of 15 seconds. Increases in both E and/or T 2 through
the EDM cell design will each improve the achievable sensitivity linearly.
5.2 Future Directions
The Geant4 framework for the RnEDM experiment can be applied to many
different applications beyond the ones studied in this work. Firstly, the β decay
package that handles particle emission is a very general code. Any β process can be
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