Calorimetric Low Temperature Detectors for High Resolution X-ray Spectroscopy on Stored Highly Stripped Heavy Ions

Conference · Sun Dec 31 00:00:00 EST 2000

OSTI ID:784303

Bleile, A; Egelhof, P; Kluge, H J; Liebisch, U; McCammon, D; Meier, H J; Sebastian, O; Stahle, C K; Stoehlker, T; Weber, M

The precise determination of the Lamb shift in heavy hydrogen-like ions provides a sensitive test of QED in very strong Coulomb fields, not accessible otherwise, and has also the potential to deduce nuclear charge radii. A brief overview on the present status of such experiments, performed at the storage ring ESR at GSI Darmstadt, is given. For the investigation of the Lyman-{alpha} transitions in Au{sup 78+} or U{sup 91+} ions with improved accuracy, a high-resolution calorimetric low-temperature detector for hard x-rays (E {le} 100 keV) has been recently developed. The detector modules consist of arrays of silicon thermistors and of x-ray absorbers made of high-Z material to optimize the absorption efficiency. The detectors are housed in a specially designed {sup 3}He/{sup 4}He dilution refrigerator which fits to the geometry of the ESR target. The detector performance presently achieved is already close to fulfilling the demands of the Lamb shift experiment. For a prototype detector an energy resolution of {Delta}E{sub FWHM} = 75 eV is obtained for 60-keV x-rays.

• Research Organization: Inst. fuer Physik, Univ. Mainz (DE); GSI, Darmstadt (DE); Dep. of Physics, Univ. of Wisconsin, Madison, Wisconsin (US); NASA/Goddard Space Flight Center, Greenbelt, Maryland (US)
• Sponsoring Organization: None (US)
• OSTI ID: 784303
• Report Number(s): ISBN 1-56396-928-9; ISSN 0094-243X; CODEN APCPCS; ISBN 1-56396-928-9; ISSN 0094-243X; CODEN APCPCS; TRN: US0106081
• Resource Relation: Conference: Nuclear Physics at Storage Rings: Fourth International Conference: STORI99, Bloomington, IN (US), 09/12/1999--09/16/1999; Other Information: PBD: 31 Dec 2000
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ATOMIC NUMBER
COULOMB FIELD
ENERGY RESOLUTION
HEAVY IONS
LAMB SHIFT
ESR STORAGE RING
X-RAY SPECTROSCOPY
GOLD IONS
URANIUM IONS
HARD X RADIATION
X-RAY DETECTION
RADIATION DETECTORS
CALORIMETERS
KEV RANGE
TEMPERATURE RANGE 0000-0013 K