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We present the uncertainty discussion of a recent experiment performed at theGSI storage ring ESR for the accurate energy measurement of the He-like uranium1s2p3P2- 1s2s3S1 intra-shell transition. For this propose we used a Johann-typeBragg spectrometer that enables to obtain a relative energy measurement betweenthe He-like uranium transition, about 4.51 keV, and a calibration x-ray source.As reference, we used the Ka fluorescence lines of zinc and the Li-like uranium1s22p2P3/2 - 1 s22s 2S1/2 intra-shell transition from fast ions stored in theESR. A comparison of the two different references, i.e., stationary and movingx-ray source, and a discussion of the experimental uncertainties is presented.

Doppler-tuned Bragg Spectroscopy of Excited Levels in He-Like Uranium: a discussion of the uncertainty contributions