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Showing 1–21 of 21 results

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The effect of density on critical current and oxygen stoichiometry of YBa₂Cu₃O_x superconductors

N. McN. Alford
W. J. Clegg
D. H. Jones
Research03 Mar 1988
Nature

Volume: 332, P: 58-59
Effects of 6-Hydroxydopamine on CNS Catecholamines, Spontaneous Motor Activity and Amphetamine Induced Hyperactivity in Rats

K. D. EVETTS
N. J. URETSKY
S. D. IVERSEN
Research07 Mar 1970
Nature

Volume: 225, P: 961-962
Identification of the phase responsible for high-temperature superconductivity in Y–Ba–Cu oxides

C. N. R. Rao
P. Ganguly
K. Sreedhar
Research01 Apr 1988
Nature

Volume: 326, P: 856-857
Antihydrogen accumulation for fundamental symmetry tests

Antihydrogen studies are important in testing the fundamental principles of physics but producing antihydrogen in large amounts is challenging. Here the authors demonstrate an efficient and high-precision method for trapping and stacking antihydrogen by using controlled plasma.

M. Ahmadi
B. X. R. Alves
J. S. Wurtele
ResearchOpen Access25 Sept 2017
Nature Communications

Volume: 8, P: 1-6
Large low-field magnetoresistance in La_0.7Ca_0.3MnO₃ induced by artificial grain boundaries

N. D. Mathur
G. Burnell
M. G. Blamire
Research15 May 1997
Nature

Volume: 387, P: 266-268
High-magnetic-field critical currents in thin films of YBa₂Cu₃O₇

J. S. Satchell
R. G. Humphreys
M. J. Kane
Research06 Jul 1988
Nature

Volume: 334, P: 331-333
Aberrant mRNA in Parkinsonism: Support for Hypothesis from Studies with Chloramphenicol

C. N. STEFANIS
M. ISSIDORIDES
Research07 Mar 1970
Nature

Volume: 225, P: 962-963
Erratum: Observation of the hyperfine spectrum of antihydrogen

M. Ahmadi
B. X. R. Alves
J. S. Wurtele
Amendments and Corrections20 Dec 2017
Nature

Volume: 553, P: 530
Precision spectroscopy of the hyperfine components of the 1S–2S transition in antihydrogen

The ALPHA Collaboration reports measurements of the hyperfine components of the 1S–2S transition in trapped antihydrogen. They interpret the results as a test of the invariance of charge–parity–time-reversal symmetry.

C. J. Baker
W. Bertsche
G. M. Shore
ResearchOpen Access17 Jan 2025
Nature Physics

Volume: 21, P: 201-207
Observation of the effect of gravity on the motion of antimatter

Magnetically confined neutral antihydrogen atoms released in a gravity field were found to fall towards Earth like ordinary matter, in accordance with Einstein’s general theory of relativity.

E. K. Anderson
C. J. Baker
J. S. Wurtele
ResearchOpen Access27 Sept 2023
Nature

Volume: 621, P: 716-722
Observation of the hyperfine spectrum of antihydrogen

The hyperfine splitting of antihydrogen has been measured and is consistent with expectations for atomic hydrogen.

M. Ahmadi
B. X. R. Alves
J. S. Wurtele
ResearchOpen Access03 Aug 2017
Nature

Volume: 548, P: 66-69
Sympathetic cooling of positrons to cryogenic temperatures for antihydrogen production

Positrons are key to the production of cold antihydrogen. Here the authors report the sympathetic cooling of positrons by interacting them with laser-cooled Be⁺ ions resulting in a three-fold reduction of the temperature of positrons for antihydrogen synthesis.

C. J. Baker
W. Bertsche
J. S. Wurtele
ResearchOpen Access22 Oct 2021
Nature Communications

Volume: 12, P: 1-8
Laser cooling of antihydrogen atoms

The successful laser cooling of trapped antihydrogen, the antimatter atom formed by an antiproton and a positron (anti-electron), is reported.

C. J. Baker
W. Bertsche
J. S. Wurtele
ResearchOpen Access31 Mar 2021
Nature

Volume: 592, P: 35-42
Characterization of the 1S–2S transition in antihydrogen

The shape of the spectral line and the resonance frequency of the 1S–2S transition in antihydrogen agree very well with those of hydrogen.

M. Ahmadi
B. X. R. Alves
J. S. Wurtele
ResearchOpen Access04 Apr 2018
Nature

Volume: 557, P: 71-75
Investigation of the fine structure of antihydrogen

Precision measurements of the 1S–2P transition in antihydrogen that take into account the standard Zeeman and hyperfine effects confirm the predictions of quantum electrodynamics.

M. Ahmadi
B. X. R. Alves
J. S. Wurtele
Research19 Feb 2020
Nature

Volume: 578, P: 375-380
An improved limit on the charge of antihydrogen from stochastic acceleration

Stochastic acceleration applied to 1,000 trapped antihydrogen atoms yields a 20-fold reduction of the experimental upper bound on the magnitude of the charge of antihydrogen, which is expected to be charge neutral.

M. Ahmadi
M. Baquero-Ruiz
A. I. Zhmoginov
ResearchOpen Access20 Jan 2016
Nature

Volume: 529, P: 373-376
Observation of the 1S–2P Lyman-α transition in antihydrogen

The observation of the 1S–2P Lyman-α transition in the antihydrogen atom, the antimatter counterpart of hydrogen, is reported.

M. Ahmadi
B. X. R. Alves
J. S. Wurtele
ResearchOpen Access22 Aug 2018
Nature

Volume: 561, P: 211-215
Observation of the 1S–2S transition in trapped antihydrogen

The 1S–2S transition in magnetically trapped atoms of antihydrogen is observed, and its frequency is shown to be consistent with that expected for hydrogen.

M. Ahmadi
B. X. R. Alves
J. S. Wurtele
ResearchOpen Access19 Dec 2016
Nature

Volume: 541, P: 506-510
Author Correction: Investigation of the fine structure of antihydrogen

M. Ahmadi
B. X. R. Alves
J. S. Wurtele
Amendments and CorrectionsOpen Access18 May 2021
Nature

Volume: 594, P: E5
Resonant quantum transitions in trapped antihydrogen atoms

These authors demonstrate resonant quantum transitions in a pure antimatter atom—antihydrogen—by using microwave radiation to flip the spin of the positron of an anti-atom in a magnetic trap, thus ejecting the anti-atom.

C. Amole
M. D. Ashkezari
J. S. Wurtele
Research07 Mar 2012
Nature

Volume: 483, P: 439-443
A comparison of exercise interventions from bed rest studies for the prevention of musculoskeletal loss

Nagarjun N. Konda
Rama S. Karri
Rochelle M. Velho
ResearchOpen Access08 May 2019
npj Microgravity

Volume: 5, P: 1-11