Geant4 Simulations for the Radon Electric Dipole Moment Search at

Table 3.2: X-ray energies and intensities per 100 Fr K-shell vacancies [49]. The total
intensity is 130.42 per 100 K-shell vacancies.
Initial K Shell Vacancy Initial L Shell Vacancy
Final L Shell Vacancy Final M Shell Vacancy
Energy (keV) Intensity (%) Energy (keV) Intensity (%)
86.105 45.8 12.031 14.6
83.231 27.9 11.896 1.63
82.496 0.0675 14.770 9.9
97.474 10.70 14.443 3.74
100.214 4.01 14.978 0.106
96.815 5.58 14.319 0.102
100.548 0.10 14.967 0.683
98.069 0.358 13.877 0.251
100.972 0.84 17.302 2.25
101.118 0.114 17.635 0.038
17.800 0.041
17.839 0.47
13.255 0.247
10.381 0.89
of 223 Rn. An average β asymmetry correlation coefficient over all branches of 223 Rn
decay has been estimated as A β ≈ 0.45 [32]. As the β particle anisotropies are not
used as a signal in the current work, and only have a minor effect associated with the
anisotropyofthebremsstrahlung photonsproduced bythestopping oftheβ particles,
this average β asymmetry parameter was used for all 223 Rn β decay branches in the
simulations presented here.
The degree of polarization, assuming a spin-temperature distribution of the magnetic
substates, can be written as [27]
P = eβ −1
e β +1 . (3.9)
where β is the spin-temperature parameter. This parameter is related to the ratios
of the populations of neighbouring magnetic substates by [27]
e β = ρ m
ρ m−1
. (3.10)
48