Zobrazeno 1 - 10
of 26
pro vyhledávání: '"L F Smale"'
X-ray measurements in helium-like atoms increased discrepancy between experiment and theoretical QED
Autor:
C T Chantler, A T Payne, J D Gillaspy, L T Hudson, L F Smale, A Henins, J A Kimpton, E Takacs
Publikováno v:
New Journal of Physics, Vol 16, Iss 12, p 123037 (2014)
A recent 15 parts per million (ppm) experiment on muonic hydrogen ( ${{{\rm p}}^{+}}{{\mu }^{-}}$ ) found a major discrepancy with quantum electrodynamics (QED) and independent nuclear size determinations. Here we find a significant discrepancy in a
Externí odkaz:
https://doaj.org/article/c309718c41a440b29bcab2aa610796f9
Publikováno v:
Acta Crystallographica Section A Foundations and Advances. 75:527-540
A characterization of the Cu Kα1,2 spectrum is presented, including the 2p satellite line, Kα3,4, the details of which are robust enough to be transferable to other experiments. This is a step in the renewed attempts to resolve inconsistencies in c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::af861a5816234adbac472a5209bd56e2
https://doi.org/10.1107/s205327331900130x
https://doi.org/10.1107/s205327331900130x
Publikováno v:
Journal of Physics B: Atomic, Molecular and Optical Physics. 53:205004
We present an absolute energy measurement of the Kβ1,3 (KM2,3) emission spectrum of scandium (Z = 21) accurate to 2.1 parts per million (ppm). The previous experimental uncertainty was estimated as 105 ppm, or 0.47 eV, therefore we improve the accur
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::18dc7dfe8bac3f5adc5d9b071b5d7217
https://doi.org/10.1088/1361-6455/abb1ff
https://doi.org/10.1088/1361-6455/abb1ff
Publikováno v:
Journal of Physics B: Atomic, Molecular and Optical Physics. 53:195002
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1b7013d36c257816d5bf9363f5fc2b35
https://doi.org/10.1088/1361-6455/aba3a6
https://doi.org/10.1088/1361-6455/aba3a6
Publikováno v:
X-Ray Spectrometry. 44:54-62
The investigation of tests of quantum electrodynamics in the X-ray regime down to 2–20 parts per million (ppm) amplifies the need for improved characterisation of asymmetric reference sources and energies in this regime. While several transition me
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6001ad69f58a0ec62a52c46e02ee9f26
https://doi.org/10.1002/xrs.2579
https://doi.org/10.1002/xrs.2579
Publikováno v:
Journal of Physics B: Atomic, Molecular and Optical Physics. 52:165002
This work reports the absolute characterisation of the Sc Kα profile. All component peaks are characterised for the first time. The satellite component centroids, line-widths, and relative intensities are determined. Energies are calibrated on an ab
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f36ea96dcf49ea9bbfe04c556d08f040
https://doi.org/10.1088/1361-6455/ab29b1
https://doi.org/10.1088/1361-6455/ab29b1
Autor:
Stephen P. Best, James R. Hester, Joey Yeo, Narges Mohammadi, M. Tauhidul Islam, Feng Wang, Christopher T. Chantler, L. F. Smale, Nicholas A. Rae
Publikováno v:
Journal of Synchrotron Radiation. 19:145-158
Methods for the quantification of statistically valid measures of the uncertainties associated with X-ray absorption fine structure (XAFS) data obtained from dilute solutions using fluorescence measurements are developed. Experimental data obtained f
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::66d857c4d552b64f7558cd33be509c8b
https://doi.org/10.1107/s0909049511056275
https://doi.org/10.1107/s0909049511056275
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 619:150-153
Various methods exist to filter cosmic rays from X-ray CCD images with weak X-ray spectra. Distortions of the characteristics of a spectral profile such as peak centroid and relative integrated peak intensities must be kept to a minimum. Optimum meth
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b6faa2ee972b9f3d2195f7f55712b546
https://doi.org/10.1016/j.nima.2010.01.007
https://doi.org/10.1016/j.nima.2010.01.007
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 619:190-197
The backgammon-type multi-wire gas proportional counter (MWPC) enables the detection of X-ray photons in two dimensions with a high degree of spatial linearity. An accurate simulation of the detector geometry is developed to further optimise the spat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::add36d1cc748e0e485494f05b0785c48
https://doi.org/10.1016/j.nima.2009.12.022
https://doi.org/10.1016/j.nima.2009.12.022
Autor:
Endre Takacs, Christopher T. Chantler, Joshua M. Pomeroy, L. F. Smale, Albert Henins, John D. Gillaspy, Joseph N. Tan, Lawrence T. Hudson, B. Radics, M. N. Kinnane, Csilla I. Szabo, J. A. Kimpton
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 580:246-249
A new data acquisition system coupled to a backgammon-type gas proportional counter capable of single-photon counting over a wide range of count rates has been developed and replaces a CAMAC-based system. The new apparatus possesses improved architec
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8a6ee6f9f0db15eb457d411bbcc097b5
https://doi.org/10.1016/j.nima.2007.05.093
https://doi.org/10.1016/j.nima.2007.05.093