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Article Dans Une Revue Physica Scripta Année : 2011

Differential energy measurement between He- and Li-like uranium intra-shell transitions

Paul Indelicato

Résumé

We present the first clear identification and highly accurate measurement of the intra-shell transition $1s2p\, ^3\!P_2 \to 1s2s\, ^3\!S_1$ of He-like uranium performed via X-ray spectroscopy. The present experiment has been conducted at the gas-jet target of the ESR storage ring in GSI (Darmstadt, Germany) where a Bragg spectrometer, with a bent germanium crystal, and a Ge(i) detector were mounted. Using the ESR deceleration capabilities, we performed a differential measurement between the $1s2p\, ^3\!P_2 \to 1s2s\, ^3\!S_1$ He-like U transition energy, at 4510 eV, and the $1s^22p\ ^2\!P_{3/2 } \to 1s^22s\, ^2\!S_{1/2}$ Li-like U transition energy, at 4460 eV. By a proper choice of the ion velocities, the X-ray energies from the He- and Li-like ions could be measured, in the laboratory frame, at the same photon energy. This allowed for a drastic reduction of the experimental systematic uncertainties, principally due to the Doppler effect, and for a comparison with the theory without the uncertainties arising from one-photon QED predictions and nuclear size corrections.
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Dates et versions

hal-00601993 , version 1 (21-06-2011)

Identifiants

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Martino Trassinelli, A. Kumar, Heinrich Beyer, Paul Indelicato, R. Märtin, et al.. Differential energy measurement between He- and Li-like uranium intra-shell transitions. Physica Scripta, 2011, T144, pp.014003. ⟨10.1088/0031-8949/2011/T144/014003⟩. ⟨hal-00601993⟩
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