Antihydrogen accumulation for fundamental symmetry tests

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.; Werf, D. P.; Wurtele, J. S.

Antihydrogen accumulation for fundamental symmetry tests

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. 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: University of Manchester
E. Butler: CERN
A. Capra: TRIUMF
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
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
D. R. Gill: TRIUMF
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: University of Manchester
S. A. Jones: College of Science, Swansea University
S. Jonsell: Stockholm University
L. Kurchaninov: TRIUMF
N. Madsen: College of Science, Swansea University
M. Mathers: York University
D. Maxwell: College of Science, Swansea University
J. T. K. McKenna: TRIUMF
S. Menary: York University
J. M. Michan: TRIUMF
T. Momose: University of British Columbia
J. J. Munich: Simon Fraser University
P. Nolan: University of Liverpool
K. Olchanski: TRIUMF
A. Olin: TRIUMF
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: Universita 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. Werf: College of Science, Swansea University
J. S. Wurtele: University of California at Berkeley

Nature Communications, 2017, vol. 8, issue 1, 1-6

Abstract: Abstract 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. Prospects for precision comparisons of the two, as tests of fundamental symmetries, are driving a vibrant programme of research. In this regard, a limiting factor in most experiments is the availability of large numbers of cold ground state antihydrogen atoms. Here, we describe how an improved synthesis process results in a maximum rate of 10.5 ± 0.6 atoms trapped and detected per cycle, corresponding to more than an order of magnitude improvement over previous work. Additionally, we demonstrate how detailed control of electron, positron and antiproton plasmas enables repeated formation and trapping of antihydrogen atoms, with the simultaneous retention of atoms produced in previous cycles. We report a record of 54 detected annihilation events from a single release of the trapped anti-atoms accumulated from five consecutive cycles.

Date: 2017
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DOI: 10.1038/s41467-017-00760-9

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