CERN Accelerating science

Published Articles

Ultimi arrivi:
2020-02-22
07:03
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
07:03
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
07:03
Charm Mixing and CP violation at LHCb / Tuci, Giulia (INFN, Pisa ; Pisa U.) /LHCb
The LHCb experiment has collected the world’s largest sample of charmed hadrons. This sample is used to measure mixing and to search for direct and indirect CP violation, and its sensitivity is now approaching the Standard Model expectations. [...]
2019 - 6 p. - Published in : J. Phys. : Conf. Ser. 1137 (2019) 012023 Fulltext: PDF;
In : BEACH2018, Peniche, Portugal, 17 - 23 Jun 2018, pp.012023

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2020-02-22
07:03
The `quasi-mosaic' effect in crystals and its applications in modern physics / Camattari, Riccardo (Ferrara U. ; INFN, Ferrara) ; Guidi, Vincenzo (Ferrara U. ; INFN, Ferrara) ; Bellucci, Valerio (Ferrara U. ; INFN, Ferrara) ; Mazzolari, Andrea (Ferrara U. ; INFN, Ferrara)
`Quasi-mosaicity' is an effect of anisotropy in crystals that permits one to obtain a curvature of internal crystallographic planes that would be flat otherwise. The term `quasi-mosaicity' was introduced by O. [...]
JAC, 2015 - 13 p. - Published in : J. Appl. Crystallogr. 48 (2015) 977-989

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2020-02-22
07:03
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
07:03
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
07:03
Study on the Characteristics of a Silicon Pixel Chip for the ALICE-ITS Upgrade Project / Kim, Jiyoung (Pusan Natl. U.) ; Yoo, In-Kwon (Pusan Natl. U.) ; Choi, Kyungeon (Pusan Natl. U.)
The ALICE (A Large Ion Collider Experiment) is a general purpose experiment dedicated to the study of heavy-ion collisions at the Large Hadron Collider (LHC). The main goal of the ALICE-ITS (Inner Tracking System) upgrade project is to improve the vertexing and the tracking capabilities at low $p_T$ according to projected increase in the luminosity at the LHC. [...]
NPSM, 2015 - 10 p. - Published in : New Phys. Sae Mulli 65 (2015) 592-601

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2020-02-22
07:03
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
07:03
Calibration of Fourier domain short coherence interferometer for absolute distance measurements / Montonen, R (Helsinki Inst. of Phys. ; Helsinki U.) ; Kassamakov, I (Helsinki Inst. of Phys. ; Helsinki U.) ; Hæggström, E (Helsinki U.) ; Österberg, K (Helsinki Inst. of Phys. ; Helsinki U.)
We calibrated and determined the measurement uncertainty of a custom-made Fourier domain short coherence interferometer operated in laboratory conditions. We compared the optical thickness of two thickness standards and three coverslips determined with our interferometer to the geometric thickness determined by SEM. [...]
OSA, 2015 - 5 p. - Published in : Appl. Opt. 54 (2015) 4635

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2020-02-22
07:03
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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