NDLI: First Experiments Aiming for Precise Lamb Shift Measurements on Hydrogen-Like Heavy Ions with Low Temperature Calorimeters

Content Provider	Springer Nature Link
Author	Andriav, V. Beckert, K. Beller, P. Bleile, A. Egelhof, P. Gumberidze, A. Ilieva, S. Kiselev, O. Kilbourne, C. Kluge, H. J. Kraft Bermuth, S. McCammon, D. Meier, J. P. Reuschl, R. Stöhlker, T. Trassinelli, M.
Copyright Year	2008
Abstract	The precise determination of the Lamb shift in hydrogen-like heavy ions provides a sensitive test of quantum electrodynamics in very strong Coulomb fields, not accessible otherwise. To increase the accuracy of the Lamb shift measurement on stored heavy ions at the ESR storage ring at GSI, a calorimetric low temperature detector for hard X-rays was developed. A prototype array consisting of 8 pixels with silicon thermistors and Sn or Pb absorbers was applied in first experiments with stored $^{238}$U$^{91+}$ and $^{207}$Pb$^{81+}$ ions interacting with an internal gas-jet target. In both experiments the Lyman-α lines were, for the first time by using calorimetric low temperature detectors, clearly identified in clean, almost background-free spectra. A total detection efficiency of 1×10$^{−7}$ for the Lyman-α lines was reached and an energy resolution of 115 eV was obtained under the present experimental conditions, which corresponds to a considerable improvement of about half an order of magnitude if compared to conventional Ge semiconductor detectors. Finally preliminary results of the data analysis and future perspectives are discussed.
Starting Page	1049
Ending Page	1054
Page Count	6
File Format	PDF
ISSN	00222291
Journal	Journal of Low Temperature Physics
Volume Number	151
Issue Number	3-4
e-ISSN	15737357
Language	English
Publisher	Springer US
Publisher Date	2008-01-31
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Calorimetric low temperature detectors for X-rays Test of QED X-ray spectra Superconducting optical, X-ray, and ?-ray detectors X-ray and ?-ray spectrometers Magnetism, Magnetic Materials Characterization and Evaluation of Materials Condensed Matter
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Materials Science

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