67 citations · 241 across the 10 of their papers we have counts for
11 papers
The helion charge radius from laser spectroscopy of muonic helium-3 ions
The CREMA Collaboration, Karsten Schuhmann, Luis M. P. Fernandes +37
Hydrogen-like light muonic ions, in which one negative muon replaces all the electrons, are extremely sensitive probes of nuclear structure, because the large muon mass increases t…
Absolute energies and emission line shapes of the L x-ray transitions of lanthanide metals
Joseph W. Fowler, Galen C. O'Neil, Bradley K. Alpert +11
We use an array of transition-edge sensors, cryogenic microcalorimeters with 4 eV energy resolution, to measure L x-ray emission-line profiles of four elements of the lanthanide se…
High-precision measurements of transition energies and level widths in He- and Be-like Argon Ions
J. Machado, C. I. Szabo, J. P. Santos +7
We performed a reference-free measurement of the transition energies of the line in He-like argon, and of the $1s 2s^2 2p\,^1P\_1\to 1s^2 2s^2\,^1S…
Wavelength-dispersive spectroscopy in the hard x-ray regime of a heavy highly-charged ion: The 1s Lamb shift in hydrogen-like gold
T. Gassner, M. Trassinelli, R. Heß +40
Accurate spectroscopy of highly charged high-Z ions in a storage ring is demonstrated to be feasible by the use of specially adapted crystal optics. The method has been applied for…
The proton radius puzzle
J. J. Krauth, K. Schuhmann, M. Abdou Ahmed +49
High-precision measurements of the proton radius from laser spectroscopy of muonic hydrogen demonstrated up to six standard deviations smaller values than obtained from electron-pr…
A Reassessment of Absolute Energies of the X-ray L Lines of Lanthanide Metals
J. W. Fowler, B. K. Alpert, D. A. Bennett +12
We introduce a new technique for determining x-ray fluorescence line energies and widths, and we present measurements made with this technique of 22 x-ray L lines from lanthanide-s…
Laser Spectroscopy of Muonic Atoms and Ions
Randolf Pohl, François Nez, Luis M. P. Fernandes +44
Laser spectroscopy of the Lamb shift (2S-2P energy difference) in light muonic atoms or ions, in which one negative muon is bound to a nucleus, has been performed. The measur…
Experiments towards resolving the proton charge radius puzzle
A. Antognini, K. Schuhmann, F. D. Amaro +34
We review the status of the proton charge radius puzzle. Emphasis is given to the various experiments initiated to resolve the conflict between the muonic hydrogen results and the…
Improved X-ray detection and particle identification with avalanche photodiodes
Marc Diepold, Luis M. P. Fernandes, Jorge Machado +36
Avalanche photodiodes are commonly used as detectors for low energy x-rays. In this work we report on a fitting technique used to account for different detector responses resulting…
A vacuum double-crystal spectrometer for reference-free highly charged ions X-ray spectroscopy
P. Amaro, C. I. Szabo, S. Schlesser +10
We have built a vacuum double crystal spectrometer, which coupled to an electron-cyclotron resonance ion source, allows to measure low-energy x-ray transitions in highly-charged io…
Electronic temperatures, densities and plasma X-ray emission of a 14.5 GHz Electron-Cyclotron Resonance Ion Source
Alexander Gumberidze, Martino Trassinelli, Nacer Adrouche +10
We have performed a systematic study of the Bremsstrahlung emission from the electrons in the plasma of a commercial 14.5 GHz Electron-Cyclotron Resonance Ion Source. The electroni…