Precise Determination of the Lyman-1 Transition Energy in Hydrogen-like Gold Ions with Microcalorimetersстатья
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Аннотация:The precise determination of the transition energy of the Lyman-alfa-1 line
in hydrogen-like heavy ions provides a sensitive test of quantum electrodynamics in
very strong Coulomb fields. We report the determination of the Lyman-alfa-1 transition
energy of gold ions (Au78+) with microcalorimeters at the experimental storage ring
at GSI. X-rays produced by the interaction of 125 MeV/u Au79+ ions with an internal
argon gas-jet target were detected. The detector array consisted of 14 pixels with
silicon thermistors and Sn absorbers, for which an energy resolution of 50 eV for an
X-ray energy of 59.5 keV was obtained in the laboratory. The Lyman-alfa-1 transition
energy was determined for each pixel in the laboratory frame, then transformed into
the emitter frame and averaged. A Dy-159 source was used for energy calibration. The
absolute positions of the detector pixels, which are needed for an accurate correction
of the Doppler shift, were determined by topographic measurements and by scanning