Geant4 Simulations for the Radon Electric Dipole Moment Search at

2.003
2.002
Weighted Average: 2.00000(8) Hz
2
χ red
= 1.869
2.001
Frequency (Hz)
2.000
1.999
1.998
1.997
1.996
0 100 200 300 400 500 600 700 800
γ-ray Energy (keV)
Figure 4.9: The resulting frequency from the weighted average of 20 precession frequency
fits for various photopeaks. The fits were generated from the data set present
in Figure 4.4 for two anti-parallel GRIFFIN detectors.
EDM measurement using Equation 2.17. The sensitivity is given by,
σ d = π
2E σ f . (4.3)
Givenanelectricfieldof5kV/cmandσ f = 0.0002Hzwefindasensitivity intheEDM
measurement of 4.14×10 −23 ecm for two anti-parallel GRIFFIN detectors, detecting
the 416 keV γ-ray from the decay of 1.2×10 9 223 Rn nuclei with a spin-depolarization
time of 15 seconds.
This fitting process was repeated for every significant photopeak which produced
a frequency signal in the 223 Rn decay. The weighted averaged of these measurements
is given in Figure 4.9. The weighting function used was
w i = 1 σ 2 i
, (4.4)
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