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Measurements of Penning-Malmberg trap patch potentials and associated performance degradation / ALPHA Collaboration
Antiprotons created by laser ionization of antihydrogen are observed to rapidly escape the ALPHA trap. Further, positron plasmas heat more quickly after the trap is illuminated by laser light for several hours. [...]
2024 - 8 p. - Published in : Phys. Rev. Res. 6 (2024) L012008 Fulltext: PDF;

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Observation of the effect of gravity on the motion of antimatter / ALPHA Collaboration
Einstein’s general theory of relativity from 19151 remains the most successful description of gravitation. From the 1919 solar eclipse2 to the observation of gravitational waves3, the theory has passed many crucial experimental tests. [...]
2023 - 23 p. - Published in : Nature 621 (2023) 716-722 Fulltext: PDF; External links: Space.com article; CERN News article; ScienceNews article; Interactions.org article; Physics article; ScienceAlert article; Phys.org article; SciTechDaily article; Physics World article; New York Times article; symmetry magazine article

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Design and performance of a novel low energy multispecies beamline for an antihydrogen experiment / ALPHA Collaboration
The ALPHA Collaboration, based at the CERN Antiproton Decelerator, has recently implemented a novel beamline for low-energy ($\lesssim$ 100 eV) positron and antiproton transport between cylindrical Penning traps that have strong axial magnetic fields. Here, we describe how a combination of semianalytical and numerical calculations were used to optimise the layout and design of this beamline. [...]
arXiv:2211.09838.- 2023-04-03 - 15 p. - Published in : Phys. Rev. Accel. Beams 26 (2023) 040101 Fulltext: 2211.09838 - PDF; Publication - PDF;

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Laser cooling of antihydrogen atoms / ALPHA Collaboration
The photon—the quantum excitation of the electromagnetic field—is massless but carries momentum. A photon can therefore exert a force on an object upon collision1. [...]
2021 - 18 p. - Published in : Nature 592 (2021) 35-52 Fulltext from Publisher: PDF; External link: Interactions.org article

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Investigation of the fine structure of antihydrogen / ALPHA Collaboration
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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Characterization of the 1S–2S transition in 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.
In 1928, Dirac published an equation that combined quantum mechanics and special relativity. Negative-energy solutions to this equation, rather than being unphysical as initially thought, represented a class of hitherto unobserved and unimagined particles—antimatter. [...]
2018 - 5 p. - Published in : Nature 557 (2018) 71-75 Fulltext: s41586-018-0017-2 - PDF; 10.1038_s41586-018-0017-2 - PDF; External link: INTERACTIONS

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Observation of the 1S–2P Lyman-$\alpha$ transition in 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
In 1906, Theodore Lyman discovered his eponymous series of transitions in the extreme-ultraviolet region of the atomic hydrogen spectrum1,2. The patterns in the hydrogen spectrum helped to establish the emerging theory of quantum mechanics, which we now know governs the world at the atomic scale. [...]
2018 - 5 p. - Published in : Nature 561 (2018) 211-215 Fulltext: PDF; External link: Interactions.org article

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Antihydrogen accumulation for fundamental symmetry tests / Ahmadi, M (Liverpool U.) ; Alves, B X R (Aarhus U.) ; Baker, C J (Swansea U.) ; Bertsche, W (Manchester U. ; Cockcroft Inst. Accel. Sci. Tech.) ; Butler, E (CERN) ; 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) et al.
Antihydrogen, a positron bound to an antiproton, is the simplest anti-atom. Its structure and properties are expected to mirror those of the hydrogen atom. [...]
2017 - 6 p. - Published in : Nature Commun. 8 (2017) 681 Fulltext: PDF;

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Observation of the hyperfine spectrum of antihydrogen / Ahmadi, M (Liverpool U.) ; Alves, B X R (Aarhus U.) ; Baker, C J (Swansea U.) ; Bertsche, W (Manchester U.) ; Butler, E (CERN) ; Capra, A (TRIUMF) ; Carruth, C (LBL, Berkeley) ; Cesar, C L (Rio de Janeiro Federal U.) ; Charlton, M (Swansea U.) ; Cohen, S (Ben Gurion U. of Negev) et al. /ALPHA
The observation of hyperfine structure in atomic hydrogen by Rabi and co-workers and the measurement of the zero-field ground-state splitting at the level of seven parts in 1013 are important achievements of mid-twentieth-century physics. The work that led to these achievements also provided the first evidence for the anomalous magnetic moment of the electron, inspired Schwinger’s relativistic theory of quantum electrodynamics, and gave rise to the hydrogen maser, which is a critical component of modern navigation, geo-positioning and very-long-baseline interferometry systems. [...]
2017 - 4 p. - Published in : Nature 548 (2017) 66-69 Fulltext: PDF;

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Limit on the electric charge of antihydrogen / Capra, A. (York U., Canada ; TRIUMF) ; Amole, C. (York U., Canada) ; Ashkezari, M.D. (Simon Fraser U.) ; Baquero-Ruiz, M. (UC, Berkeley) ; Bertsche, W. (Manchester U. ; Cockcroft Inst. Accel. Sci. Tech.) ; Butler, E. (Imperial Coll., London ; CERN) ; Cesar, C.L. (Rio de Janeiro Federal U.) ; Charlton, M. (Swansea U.) ; Eriksson, S. (Swansea U.) ; Fajans, J. (UC, Berkeley ; LBL, Berkeley) et al.
The ALPHA collaboration has successfully demonstrated the production and the confinement of cold antihydrogen, $\overline{\mathrm{H}}$. An analysis of trapping data allowed a stringent limit to be placed on the electric charge of the simplest antiatom. [...]
arXiv:2107.08152.- 2016-12-20 - 7 p. - Published in : Hyperfine Interact. 238 (2017) 9 Fulltext: PDF;
In : 6th International Symposium on Symmetries in Subatomic Physics, Victoria, Canada, 08 - 12 Jun 2015, pp.9

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See also: similar author names
32	Gill, R D
1	Gill, R I
17	Gill, R L
1	Gill, R R Rockingham
1	Gill, R S
5	Gill, R.
12	Gill, Ramandeep
11	Gill, Richard D
1	Gill, Richard M
1	Gill, Ronald

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