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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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3.
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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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4.
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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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5.
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Enhanced Control and Reproducibility of Non-Neutral Plasmas
/ 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
The simultaneous control of the density and particle number of non-neutral plasmas confined in Penning-Malmberg traps is demonstrated. Control is achieved by setting the plasma’s density by applying a rotating electric field while simultaneously fixing its axial potential via evaporative cooling. [...]
2018 - 6 p.
- Published in : Phys. Rev. Lett. 120 (2018) 025001
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6.
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Fundamental Tests of Physics with Antihydrogen at ALPHA
/ Miranda, Daniel (UFRJ, Rio de Janeiro) ; Cesar, Claudio L (UFRJ, Rio de Janeiro) ; Sacramento, Rodrigo L (UFRJ, Rio de Janeiro) ; Ahmadi, Mostafa (U. Liverpool (main)) ; Nolan, Paul (U. Liverpool (main)) ; Pusa, Petteri (U. Liverpool (main)) ; Baquero-Ruiz, Marcelo (UC, Berkeley (main)) ; Carruth, Celeste (UC, Berkeley (main)) ; Charman, Andrew (UC, Berkeley (main)) ; Evans, Lenny (UC, Berkeley (main)) et al.
Magnetically trapped antihydrogen atoms at low temperatures were used to test the charge neutrality of this antiatomic system, by precisely placing a limit to its electrical charge. A new method for measuring the gravitational interaction of antimatter was also developed, and prospects for making a precise measurement of this interaction are discussed. [...]
2016
- Published in : 10.1364/LAOP.2016.LTu3B.1
In : OSA Latin America Optics and Photonics Conference, Medellin, Colombia, 22 - 26 Aug 2016, pp.LTu3B.1
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7.
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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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8.
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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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9.
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An improved limit on the charge of antihydrogen from stochastic acceleration
/ Ahmadi, M ; Baquero-Ruiz, M ; Bertsche, W ; Butler, E (CERN) ; Capra, A ; Carruth, C ; Cesar, C L ; Charlton, M ; Charman, A E ; Eriksson, S et al.
/ALPHA
Antimatter continues to intrigue physicists because of its apparent absence in the observable Universe. Current theory requires that matter and antimatter appeared in equal quantities after the Big Bang, but the Standard Model of particle physics offers no quantitative explanation for the apparent disappearance of half the Universe [...]
2016
- Published in : Nature 529 (2016) 373-376
Fulltext: PDF;
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10.
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Observation of the 1S–2S transition in trapped 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.) ; 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.
The spectrum of the hydrogen atom has played a central part in fundamental physics in the past 200 years. Historical examples of its significance include the wavelength measurements of absorption lines in the solar spectrum by Fraunhofer, the identification of transition lines by Balmer, Lyman et al., the empirical description of allowed wavelengths by Rydberg, the quantum model of Bohr, the capability of quantum electrodynamics to precisely predict transition frequencies, and modern measurements of the 1S–2S transition by Hänsch1 to a precision of a few parts in 1015. [...]
2017
- Published in : Nature 541 (2017) 506–510
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