Using a microcalorimeter to measure the Lamb shift in hydrogenic gold and uranium on cooled, decelerated ion beams

Schnopper, H. W.; Austin, G.; Ingram, Russell H.; Guth, Giora; Murray, S. S.; Madden, N.; Landis, D.A.; Beeman, J. W.; Haller, E. E.; Stöhlker, Th.

doi:10.1016/j.nima.2003.11.220

Cited by 10 publications

(4 citation statements)

References 2 publications

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“…This detection principle provides considerable advantage with respect to the energy resolution, because the excitation energy of a phonon is about 1000 times smaller than the excitation energy of an electron-hole pair in a conventional germanium x-ray detector. Accordingly, microcalorimeters for hard x-rays with x-ray energies in the range of 20-120keV have been developed for application at the ESR [20][21][22][23] as well as for application at the EBIT and SuperEBIT at the Lawrence Livermore National Laboratory [24][25][26] and for γ-spectroscopy [27,28]. In all cases, an excellent energy resolution of D » -E E 10 3 has been obtained.…”

Section: Introductionmentioning

confidence: 99%

“…The application of microcalorimeters at the ESR at the GSI Helmholtz Center was first suggested by Egelhof et al [29]. A first attempt using germanium microcalorimeters was made in 2003 [22], but the direct detection of the Lyman-α lines failed due to low detection efficiency at high x-ray energies as well as due to the small solid angle. Only an indirect determination of the transition energy with a very large error bar was obtained.…”

Section: Introductionmentioning

confidence: 99%

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Precise determination of the 1s Lamb shift in hydrogen-like lead and gold using microcalorimeters

Kraft‐Bermuth

Andrianov

Bleile

et al. 2017

J. Phys. B: At. Mol. Opt. Phys.

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Quantum electrodynamics in very strong Coulomb fields is one scope which has not yet been tested experimentally with sufficient accuracy to really determine whether the perturbative approach is valid. One sensitive test is the determination of the 1s Lamb shift in highly-charged very heavy ions. The 1s Lamb shift of hydrogen-like lead (Pb 81+ ) and gold (Au 78+ ) has been determined using the novel detector concept of silicon microcalorimeters for the detection of hard x-rays. The results of  260 53 ( ) eV for lead and  211 42 () eV for gold are within the error bars in good agreement with theoretical predictions. To our knowledge, for hydrogen-like lead, this represents the most accurate determination of the 1s Lamb shift.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Precise determination of the 1s Lamb shift in hydrogen-like lead and gold using microcalorimeters

Kraft‐Bermuth

Andrianov

Bleile

et al. 2017

J. Phys. B: At. Mol. Opt. Phys.

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“…2). These neighboring lines are several tens of eV away from the 3 P 2 → 3 S 1 line and can be easily distinguished using crystal spectrometers or bolometer techniques [16].…”

Section: Description Of the Experimentsmentioning

confidence: 99%

High-accuracy crystal spectroscopy of the n = 2 energy level of helium-like uranium

Trassinelli¹,

Banaś²,

Beyer³

et al. 2007

Can. J. Phys.

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We present a new experiment for the accurate study of the intrashell transition 1s2p 3 P 2 → 1s2s 3 S 1 in helium-like uranium near 4.5 keV using a Johann-type Bragg spectrometer with a spherically bent crystal. The focusing property of the bent crystal enhances the spectrometer's efficiency compared to flat crystal spectrometers and it will enable us, for the first time, to evaluate, accurately, the Lamb shift for n = 2 states in highly charged helium-like ions. The data will be acquired at the storage ring ESR of GSI using a fast H-like uranium beam colliding with a gas target. This measurement will provide the most sensitive test for the relativistic electron-electron interaction in a strong Coulomb field. PACS Nos.: 07.85. Nc, 12.20.Fv, 29.30.Kv and 32.30.Rj Résumé : Nous présentons une nouvelle expérience pour étudier de façon précise la transition intra-couches 1s2p 3 P 2 → 1s2p 3 S 1 dans l'uranium héliumoïde autour de 4.5 keV, en utilisant un spectromètre de Bragg de type Johann avec un cristal courbé sphériquement. Les propriétés de focalisation du cristal courbé amplifient l'efficacité du spectromètre par comparaison avec un spectromètre à cristal plan et ils permettront pour la première fois d'évaluer de façon précise le déplacement de Lamb des états n = 2 dans les ions hautement chargés héliumoïdes. Les données seront recueillies à l'anneau de stockage ESR du GSI en utilisant un faisceau rapide d'uranium hydrogéoïde incident sur une cible gazeuse. Cette mesure sera le test le plus précis des effets relativistes entre électrons dans un fort champ coulombien.[Traduit par la Rédaction]

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“…Therefore, applying microcalorimeters may eventually improve the accuracy of the 1s Lamb Shift in hydrogen-like heavy ions below the 1% which is the current state-of-the-art [19]. A first attempt with germanium microcalorimeters was made in 2003 [35]. It showed that it was necessary to develop a microcalorimeter setup which is adapted to the specific experimental conditions at the ESR.…”

Section: Introductionmentioning

confidence: 99%

Microcalorimeters for X-Ray Spectroscopy of Highly Charged Ions at Storage Rings

Kraft‐Bermuth

Hengstler

Egelhof

et al. 2018

Atoms

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X-ray spectroscopy of highly charged heavy ions is an important tool for the investigation of many topics in atomic physics. Such highly charged ions, in particular hydrogen-like uranium, are investigated at heavy ion storage rings, where high charge states can be produced in large quantities, stored for long times and cooled to low momentum spread of the ion beam. One prominent example is the determination of the 1s Lamb Shift in hydrogen-like heavy ions, which has been investigated at the Experimental Storage Ring (ESR) at the GSI Helmholtz Centre for Heavy Ion Research. Due to the large electron binding energies, the energies of the corresponding photon transitions are located in the X-ray regime. To determine the transition energies with high accuracy, highly resolving X-ray spectrometers are needed. One concept of such spectrometers is the concept of microcalorimeters, which, in contrast to semiconductor detectors, uses the detection of heat rather than charge to detect energy. Such detectors have been developed and successfully applied in experiments at the ESR. For experiments at the Facility for Antiproton and Ion Research (FAIR), the Stored Particles and Atoms Collaboration (SPARC) pursues the development of new microcalorimeter concepts and larger detector arrays. Next to fundamental investigations on quantum electrodynamics such as the 1s Lamb Shift or electron–electron interactions in two- and three-electron systems, X-ray spectroscopy may be extended towards nuclear physics investigations like the determination of nuclear charge radii.

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Using a microcalorimeter to measure the Lamb shift in hydrogenic gold and uranium on cooled, decelerated ion beams

Cited by 10 publications

References 2 publications

Precise determination of the 1s Lamb shift in hydrogen-like lead and gold using microcalorimeters

Precise determination of the 1s Lamb shift in hydrogen-like lead and gold using microcalorimeters

High-accuracy crystal spectroscopy of the n = 2 energy level of helium-like uranium

Microcalorimeters for X-Ray Spectroscopy of Highly Charged Ions at Storage Rings

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