Zobrazeno 1 - 10
of 25
pro vyhledávání: '"J A Kimpton"'
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:
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:
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
Publikováno v:
Radiation Physics and Chemistry. 75:1744-1748
The electron beam ion trap has opened the door for experimental physics to perform critical tests of bound state QED in the medium- Z regime. The relatively small uncertainties associated with the theoretical predictions necessitate highly accurate e
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4cf4ac0b8871c145db864606a76f0cee
https://doi.org/10.1016/j.radphyschem.2005.09.017
https://doi.org/10.1016/j.radphyschem.2005.09.017
Publikováno v:
Measurement Science and Technology. 16:2280-2286
Two-dimensional backgammon configuration and multiwire gas proportional counters have been in use for decades in the field of x-ray physics for high-precision or high-flux experiments. Systematics inherent to this type of detector lead to image disto
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9d194f8a2369d4cf9006ffb7be381778
https://doi.org/10.1088/0957-0233/16/11/021
https://doi.org/10.1088/0957-0233/16/11/021
Publikováno v:
Scottish Medical Journal. 57:1-3
Gastrointestinal angiodysplasia (GIAD) of the jejunum is a rare cause of acute upper and lower gastrointestinal bleeding in the paediatric population. This is the case of a previously well 10-year-old girl who presented with acute rectal haemorrhage,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8d95f4f7a1c7ebc64fcd6adb3848e65e
https://doi.org/10.1258/smj.2012.012082
https://doi.org/10.1258/smj.2012.012082
Autor:
Endre Takacs, John D. Gillaspy, Christopher T. Chantler, L. F. Smale, Lawrence T. Hudson, J A Kimpton, Albert Henins, A T Payne
A recent 15 parts-per-million (ppm) experiment on muonic hydrogen found a major discrepancy with QED and independent nuclear size determinations. Here we find a significant discrepancy in a different type of exotic atom, a medium-Z nucleus with two e
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4b4bbcb1e1d71c63a3086439419b6deb
Autor:
K. Makonyi, Albert Henins, A T Payne, John D. Gillaspy, Lawrence T. Hudson, J. A. Kimpton, Joshua M. Pomeroy, M. N. Kinnane, Endre Takacs, Christopher T. Chantler, L. F. Smale
Publikováno v:
Physical Review Letters. 110
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::894a96037b1947fc3fcaf4dabfb49179
https://doi.org/10.1103/physrevlett.110.159302
https://doi.org/10.1103/physrevlett.110.159302
Publikováno v:
Physical Review A. 87
Characteristic radiation is used extensively in most high-accuracy x-ray experiments as a standard for calibration, both in laboratory physics and in astrophysics. $K\ensuremath{\alpha}$ and $K\ensuremath{\beta}$ radiations have complex asymmetric st
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1099293055ed9da511e3e27225829666
https://doi.org/10.1103/physreva.87.022512
https://doi.org/10.1103/physreva.87.022512