Observation of the 1S–2S transition in trapped antihydrogen

Ahmadi, M.; Alves, B. X. R.; Baker, C. J.; Bertsche, W.; Butler, E.; Capra, A.; Carruth, C.; Cesar, C. L.; Charlton, M.; Cohen, S.; Collister, R.; Eriksson, S.; Evans, A.; Evetts, N.; Fajans, J.; Friesen, T.; Fujiwara, M. C.; Gill, D. R.; Gutierrez, A.; Hangst, J. S.; Hardy, W. N.; Hayden, M. E.; Isaac, C. A.; Ishida, A.; Johnson, M. A.; Jones, S. A.; Jonsell, S.; Kurchaninov, L.; Madsen, N.; Mathers, M.; Maxwell, D.; McKenna, J. T. K.; Menary, S.; Michan, J. M.; Momose, T.; Munich, J. J.; Nolan, P.; Olchanski, K.; Olin, A.; Pusa, P.; Rasmussen, C. Ø.; Robicheaux, F.; Sacramento, R. L.; Sameed, M.; Sarid, E.; Silveira, D. M.; Stracka, S.; Stutter, G.; So, C.; Tharp, T. D.; Thompson, J. E.; Thompson, R. I.; van der Werf, D. P.; Wurtele, J. S.

Observation of the 1S–2S transition in trapped antihydrogen

M. Ahmadi, B. X. R. Alves, C. J. Baker, W. Bertsche, E. Butler, A. Capra, C. Carruth, C. L. Cesar, M. Charlton, S. Cohen, R. Collister, S. Eriksson, A. Evans, N. Evetts, J. Fajans, T. Friesen, M. C. Fujiwara, D. R. Gill, A. Gutierrez, J. S. Hangst (), W. N. Hardy, M. E. Hayden, C. A. Isaac, A. Ishida, M. A. Johnson, S. A. Jones, S. Jonsell, L. Kurchaninov, N. Madsen, M. Mathers, D. Maxwell, J. T. K. McKenna, S. Menary, J. M. Michan, T. Momose, J. J. Munich, P. Nolan, K. Olchanski, A. Olin, P. Pusa, C. Ø. Rasmussen, F. Robicheaux, R. L. Sacramento, M. Sameed, E. Sarid, D. M. Silveira, S. Stracka, G. Stutter, C. So, T. D. Tharp, J. E. Thompson, R. I. Thompson, D. P. van der Werf and J. S. Wurtele
Additional contact information
M. Ahmadi: University of Liverpool
B. X. R. Alves: Aarhus University
C. J. Baker: College of Science, Swansea University
W. Bertsche: School of Physics and Astronomy, University of Manchester
E. Butler: CERN
A. Capra: TRIUMF, 4004 Wesbrook Mall
C. Carruth: University of California at Berkeley
C. L. Cesar: Instituto de Fisica, Universidade Federal do Rio de Janeiro
M. Charlton: College of Science, Swansea University
S. Cohen: Ben-Gurion University of the Negev
R. Collister: TRIUMF, 4004 Wesbrook Mall
S. Eriksson: College of Science, Swansea University
A. Evans: University of Calgary
N. Evetts: University of British Columbia
J. Fajans: University of California at Berkeley
T. Friesen: Aarhus University
M. C. Fujiwara: TRIUMF, 4004 Wesbrook Mall
D. R. Gill: TRIUMF, 4004 Wesbrook Mall
A. Gutierrez: University College London
J. S. Hangst: Aarhus University
W. N. Hardy: University of British Columbia
M. E. Hayden: Simon Fraser University
C. A. Isaac: College of Science, Swansea University
A. Ishida: The University of Tokyo
M. A. Johnson: School of Physics and Astronomy, University of Manchester
S. A. Jones: College of Science, Swansea University
S. Jonsell: Stockholm University
L. Kurchaninov: TRIUMF, 4004 Wesbrook Mall
N. Madsen: College of Science, Swansea University
M. Mathers: York University
D. Maxwell: College of Science, Swansea University
J. T. K. McKenna: TRIUMF, 4004 Wesbrook Mall
S. Menary: York University
J. M. Michan: TRIUMF, 4004 Wesbrook Mall
T. Momose: University of British Columbia
J. J. Munich: Simon Fraser University
P. Nolan: University of Liverpool
K. Olchanski: TRIUMF, 4004 Wesbrook Mall
A. Olin: TRIUMF, 4004 Wesbrook Mall
P. Pusa: University of Liverpool
C. Ø. Rasmussen: Aarhus University
F. Robicheaux: Purdue University
R. L. Sacramento: Instituto de Fisica, Universidade Federal do Rio de Janeiro
M. Sameed: College of Science, Swansea University
E. Sarid: Soreq NRC
D. M. Silveira: Instituto de Fisica, Universidade Federal do Rio de Janeiro
S. Stracka: Universitá di Pisa and Sezione INFN di Pisa
G. Stutter: Aarhus University
C. So: University of Calgary
T. D. Tharp: Marquette University
J. E. Thompson: York University
R. I. Thompson: University of Calgary
D. P. van der Werf: College of Science, Swansea University
J. S. Wurtele: University of California at Berkeley

Nature, 2017, vol. 541, issue 7638, 506-510

Abstract: 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.

Date: 2017
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DOI: 10.1038/nature21040

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