2020-02-22
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Investigation of the fine structure of antihydrogen
/ Ahmadi, M (Liverpool U.) ; Alves, B X R (Aarhus U.) ; Baker, C J (Swansea U.) ; Bertsche, W (Manchester U. ; Cockcroft Inst. Accel. Sci. Tech.) ; Capra, A (TRIUMF) ; Carruth, C (UC, Berkeley) ; Cesar, C L (Rio de Janeiro Federal U.) ; Charlton, M (Swansea U.) ; Cohen, S (Ben Gurion U. of Negev) ; Collister, R (TRIUMF) et al.
/ALPHA
At the historic Shelter Island Conference on the Foundations of Quantum Mechanics in 1947, Willis Lamb reported an unexpected feature in the fne structure of atomic hydrogen: a separation of the 2S$_{1/2}$ and 2P$_{1/2}$ states1. The observation of this separation, now known as the Lamb shift, marked an important event in the evolution of modern physics, inspiring others to develop the theory of quantum electrodynamics2–5. [...]
2020 - 10 p.
- Published in : Nature 578 (2020) 375-380
Fulltext: PDF; External links: INTERACTIONS; Nature News and Views article
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2020-02-22
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Between atomic and nuclear physics: radioactive decays of highly-charged ions
/ Atanasov, Dinko (Darmstadt, GSI ; Heidelberg, Max Planck Inst.) ; Blaum, Klaus (Heidelberg, Max Planck Inst. ; Heidelberg U.) ; Bosch, Fritz (Darmstadt, GSI) ; Brandau, Carsten (Darmstadt, GSI ; U. Giessen (main)) ; Bühler, Paul (Stefan Meyer Inst. Subatomare Phys.) ; Chen, Xiangcheng (Darmstadt, GSI ; Lanzhou, Inst. Modern Phys.) ; Dillmann, Iris (Darmstadt, GSI ; U. Giessen (main) ; TRIUMF) ; Faestermann, Thomas (Munich, Tech. U.) ; Gao, Bingshui (Darmstadt, GSI ; Heidelberg, Max Planck Inst. ; Lanzhou, Inst. Modern Phys. ; Beijing, GUCAS) ; Geissel, Hans (Darmstadt, GSI ; U. Giessen (main)) et al.
/FRS-ESR ; ILIMA ; SPARC ; TBWD,
Highly charged radioactive ions can be stored for extended periods of time in storage rings which allows for precision measurements of their decay modes. The straightforward motivation for performing such studies is that fully ionised nuclei or few-electron ions can be viewed as clean quantum-mechanical systems, in which the interactions of the many electrons can be either excluded or treated precisely. [...]
IOP, 2015 - 17 p.
- Published in : J. Phys. B 48 (2015) 144024
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2020-02-22
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2020-02-22
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2020-02-22
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Analysis of 440 GeV proton beam–matter interaction experiments at the High Radiation Materials test facility at CERN
/ Burkart, F (Frankfurt U. ; CERN) ; Schmidt, R (CERN) ; Raginel, V (CERN) ; Wollmann, D (CERN) ; Tahir, N A (Darmstadt, GSI) ; Shutov, A (IPCP, Chernogolovka) ; Piriz, A R (Castilla-La Mancha U.)
In a previous paper [Schmidt et al., Phys. Plasmas 21, 080701 (2014)], we presented the first results on beam–matter interaction experiments that were carried out at the High Radiation Materials test facility at CERN. [...]
AIP, 2015 - 9 p.
- Published in : J. Appl. Phys. 118 (2015) 055902
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2020-02-22
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Transformer ratio saturation in a beam-driven wakefield accelerator
/ Farmer, J P (Heinrich Heine U., Dusseldorf) ; Martorelli, R (Heinrich Heine U., Dusseldorf) ; Pukhov, A (Heinrich Heine U., Dusseldorf)
We show that for beam-driven wakefield acceleration, the linearly ramped, equally spaced train of bunches typically considered to optimise the transformer ratio only works for flat-top bunches. Through theory and simulation, we explain that this behaviour is due to the unique properties of the plasma response to a flat-top density profile. [...]
AIP, 2015 - 6 p.
- Published in : Phys. Plasmas 22 (2015) 123113
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2020-02-22
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2020-02-22
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Physics with antihydrogen
/ Bertsche, W A (Cockcroft Inst. Accel. Sci. Tech. ; Manchester U.) ; Butler, E (Imperial Coll., London) ; Charlton, M (Swansea U.) ; Madsen, N (Swansea U.)
Performing measurements of the properties of antihydrogen, the bound state of an antiproton and a positron, and comparing the results with those for ordinary hydrogen, has long been seen as a route to test some of the fundamental principles of physics. There has been much experimental progress in this direction in recent years, and antihydrogen is now routinely created and trapped and a range of exciting measurements probing the foundations of modern physics are planned or underway. [...]
IOP, 2015 - 26 p.
- Published in : J. Phys. B 48 (2015) 232001
Fulltext: fulltext - PDF; fulltext1616685 - PDF; Fulltext from Publisher: PDF; External link: Fulltext
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2020-02-22
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2020-02-22
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Towards a precise measurement of the antihydrogen ground state hyperfine splitting in a beam: the case of in-flight radiative decays
/ Lundmark, R (Chalmers U. Tech.) ; Malbrunot, C (CERN ; INFN, Trento ; Stefan Meyer Inst. Subatomare Phys. ; Trento U.) ; Nagata, Y (KEK, Tsukuba) ; Radics, B (Zurich, ETH) ; Sauerzopf, C (Stefan Meyer Inst. Subatomare Phys.) ; Widmann, E (Stefan Meyer Inst. Subatomare Phys.)
The ASACUSA antihydrogen setup at the CERN Antiproton Decelerator (AD) consists of an antihydrogen source (cusp magnet coupled to a positron source and an antiproton catching magnet) followed by a spectrometer beamline. After production in the cusp, the antihydrogen atoms decay while they escape the trap leading to changes in their effective magnetic moment which in turn affect their trajectories in the beamline. [...]
IOP, 2015 - 8 p.
- Published in : J. Phys. B 48 (2015) 184001
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