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Trapped antihydrogen

Butler, E. ; Andresen, G. ; Ashkezari, M. ; Baquero-Ruiz, M. ; Bertsche, W. ; Bowe, P. ; Cesar, C. ; Chapman, S. ; Charlton, M. ; Deller, A. ; Eriksson, S. ; Fajans, J. ; Friesen, T. ; Fujiwara, M. ; Gill, D. ; Gutierrez, A. ; Hangst, J. ; Hardy, W. ; Hayden, M. ; Humphries, A. ; Hydomako, R. ; Jenkins, M. ; Jonsell, S. ; Jørgensen, L. ; Kemp, S. ; Kurchaninov, L. ; Madsen, N. ; Menary, S. ; Nolan, P. ; Olchanski, K. ; Olin, A. ; Povilus, A. ; Pusa, P. ; Rasmussen, C. ; Robicheaux, F. ; Sarid, E. ; Seif el Nasr, S. ; Silveira, D. ; So, C. ; Storey, J. ; Thompson, R. ; van der Werf, D. ; Wurtele, J. ; Yamazaki, Y.

In: Hyperfine Interactions, 2012, vol. 212, no. 1-3, p. 15-29

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    Titel
    • Trapped antihydrogen
    Autor
    • Butler, E.. Physics Department, CERN, 1211, Geneva 23, Switzerland
    • Andresen, G.. Department of Physics and Astronomy, Aarhus University, 8000, Aarhus C, Denmark
    • Ashkezari, M.. Department of Physics, Simon Fraser University, V5A 1S6, Burnaby, BC, Canada
    • Baquero-Ruiz, M.. Department of Physics, University of California, 94720-7300, Berkeley, CA, USA
    • Bertsche, W.. Department of Physics, Swansea University, SA2 8PP, Swansea, UK
    • Bowe, P.. Department of Physics and Astronomy, Aarhus University, 8000, Aarhus C, Denmark
    • Cesar, C.. Instituto de Física, Universidade Federal do Rio de Janeiro, 21941-972, Rio de Janeiro, Brazil
    • Chapman, S.. Department of Physics, University of California, 94720-7300, Berkeley, CA, USA
    • Charlton, M.. Department of Physics, Swansea University, SA2 8PP, Swansea, UK
    • Deller, A.. Department of Physics, Swansea University, SA2 8PP, Swansea, UK
    • Eriksson, S.. Department of Physics, Swansea University, SA2 8PP, Swansea, UK
    • Fajans, J.. Department of Physics, University of California, 94720-7300, Berkeley, CA, USA
    • Friesen, T.. Department of Physics and Astronomy, University of Calgary, T2N 1N4, Calgary, AB, Canada
    • Fujiwara, M.. Department of Physics and Astronomy, University of Calgary, T2N 1N4, Calgary, AB, Canada
    • Gill, D.. TRIUMF, 4004 Wesbrook Mall, V6T 2A3, Vancouver, BC, Canada
    • Gutierrez, A.. Department of Physics and Astronomy, University of British Columbia, V6T 1Z4, Vancouver, BC, Canada
    • Hangst, J.. Department of Physics and Astronomy, Aarhus University, 8000, Aarhus C, Denmark
    • Hardy, W.. Department of Physics and Astronomy, University of British Columbia, V6T 1Z4, Vancouver, BC, Canada
    • Hayden, M.. Department of Physics, Simon Fraser University, V5A 1S6, Burnaby, BC, Canada
    • Humphries, A.. Department of Physics, Swansea University, SA2 8PP, Swansea, UK
    • Hydomako, R.. Department of Physics and Astronomy, University of Calgary, T2N 1N4, Calgary, AB, Canada
    • Jenkins, M.. Department of Physics, Swansea University, SA2 8PP, Swansea, UK
    • Jonsell, S.. Department of Physics, Stockholm University, 10691, Stockholm, Sweden
    • Jørgensen, L.. Department of Physics, Swansea University, SA2 8PP, Swansea, UK
    • Kemp, S.. Physics Department, CERN, 1211, Geneva 23, Switzerland
    • Kurchaninov, L.. TRIUMF, 4004 Wesbrook Mall, V6T 2A3, Vancouver, BC, Canada
    • Madsen, N.. Department of Physics, Swansea University, SA2 8PP, Swansea, UK
    • Menary, S.. Department of Physics and Astronomy, York University, M3J 1P3, Toronto, ON, Canada
    • Nolan, P.. Department of Physics, University of Liverpool, L69 7ZE, Liverpool, UK
    • Olchanski, K.. TRIUMF, 4004 Wesbrook Mall, V6T 2A3, Vancouver, BC, Canada
    • Olin, A.. TRIUMF, 4004 Wesbrook Mall, V6T 2A3, Vancouver, BC, Canada
    • Povilus, A.. Department of Physics, University of California, 94720-7300, Berkeley, CA, USA
    • Pusa, P.. Department of Physics, University of Liverpool, L69 7ZE, Liverpool, UK
    • Rasmussen, C.. Department of Physics and Astronomy, Aarhus University, 8000, Aarhus C, Denmark
    • Robicheaux, F.. Department of Physics, Auburn University, 36849-5311, Auburn, AL, USA
    • Sarid, E.. Department of Physics, NRCN-Nuclear Research Center Negev, 84190, Beer Sheva, Israel
    • Seif el Nasr, S.. Department of Physics and Astronomy, University of British Columbia, V6T 1Z4, Vancouver, BC, Canada
    • Silveira, D.. Atomic Physics Laboratory, RIKEN Advanced Science Institute, Wako, 351-0198, Saitama, Japan
    • So, C.. Department of Physics, University of California, 94720-7300, Berkeley, CA, USA
    • Storey, J.. TRIUMF, 4004 Wesbrook Mall, V6T 2A3, Vancouver, BC, Canada
    • Thompson, R.. Department of Physics and Astronomy, University of Calgary, T2N 1N4, Calgary, AB, Canada
    • van der Werf, D.. Department of Physics, Swansea University, SA2 8PP, Swansea, UK
    • Wurtele, J.. Department of Physics, University of California, 94720-7300, Berkeley, CA, USA
    • Yamazaki, Y.. Atomic Physics Laboratory, RIKEN Advanced Science Institute, Wako, 351-0198, Saitama, Japan
    Dokumententyp
    • Postprint
    Sprache
    • Englisch
    Veröffentlicht in
    • Hyperfine Interactions, 2012, vol. 212, no. 1-3, p. 15-29. Springer Netherlands
    Andere elektronische Ausgabe
    OAI-PMH-ID
    • oai:doc.rero.ch:313617
    Summary
    Precision spectroscopic comparison of hydrogen and antihydrogen holds the promise of a sensitive test of the Charge-Parity-Time theorem and matter-antimatter equivalence. The clearest path towards realising this goal is to hold a sample of antihydrogen in an atomic trap for interrogation by electromagnetic radiation. Achieving this poses a huge experimental challenge, as state-of-the-art magnetic-minimum atom traps have well depths of only ∼1T (∼0.5K for ground state antihydrogen atoms). The atoms annihilate on contact with matter and must be ‘born' inside the magnetic trap with low kinetic energies. At the ALPHA experiment, antihydrogen atoms are produced from antiprotons and positrons stored in the form of non-neutral plasmas, where the typical electrostatic potential energy per particle is on the order of electronvolts, more than 104 times the maximum trappable kinetic energy. In November 2010, ALPHA published the observation of 38 antiproton annihilations due to antihydrogen atoms that had been trapped for at least 172ms and then released—the first instance of a purely antimatter atomic system confined for any length of time (Andresen etal., Nature 468:673, 2010). We present a description of the main components of the ALPHA traps and detectors that were key to realising this result. We discuss how the antihydrogen atoms were identified and how they were discriminated from the background processes. Since the results published in Andresen etal. (Nature 468:673, 2010), refinements in the antihydrogen production technique have allowed many more antihydrogen atoms to be trapped, and held for much longer times. We have identified antihydrogen atoms that have been trapped for at least 1,000s in the apparatus (Andresen etal., Nature Physics 7:558, 2011). This is more than sufficient time to interrogate the atoms spectroscopically, as well as to ensure that they have relaxed to their ground state