Extended Data Fig. 1: Prompt response function.
From: Direct measurement of the intrinsic electric dipole moment in pear-shaped thorium-228
The prompt response differences (PRD) of the fast-timing apparatus. The top panel shows the \(\gamma-\gamma\) time-walk dependence with \(\gamma\) -ray energy of the fast-timing apparatus. Data points correspond to transitions depopulating prompt states in \({}^{152}\) Sm and \({}^{152}\) Gd following the \(\beta\) -decay of \(^{152}\) Eu. Error bars, representing two standard deviations, are smaller than the symbols for the data points. The function fitted to the data has the form \(\text{PRD}(E_\gamma) = \frac{a}{\sqrt{E_\gamma+b}}+c{E_\gamma}^2+dE_\gamma+e\) where \(E_\gamma\) is the \(\gamma\) -ray energy and a,b,c,d and e are parameters to be determined. The bottom panel shows the differences between the data and the fitted prompt response function with the dashed lines showing the mean uncertainty of the fit corresponding to two standard deviations.
