A source of antihydrogen for in-flight hyperfine spectroscopy.
Antihydrogen, a positron bound to an antiproton, is the simplest antiatom. Its counterpart-hydrogen--is one of the most precisely investigated and best understood systems in physics research. High-resolution comparisons of both systems provide sensitive tests of CPT symmetry, which is the most fundamental symmetry in the Standard Model of elementary particle physics. Any measured difference would point to CPT violation and thus to new physics. Here we report the development of an antihydrogen source using a cusp trap for in-flight spectroscopy. A total of 80 antihydrogen atoms are unambiguously detected 2.7 m downstream of the production region, where perturbing residual magnetic fields are small. This is a major step towards precision spectroscopy of the ground-state hyperfine splitting of antihydrogen using Rabi-like beam spectroscopy.
Institute of Physics, Graduate School of Arts and Sciences, University of Tokyo, Tokyo 153-8902, Japan.
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Kuroda
Ulmer Initiative Research Unit, RIKEN, Saitama 351-0198, Japan.
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Ulmer
Atomic Physics Laboratory, RIKEN, Saitama 351-0198, Japan.
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Murtagh
Atomic Physics Laboratory, RIKEN, Saitama 351-0198, Japan.
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Van Gorp
Atomic Physics Laboratory, RIKEN, Saitama 351-0198, Japan.
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Nagata
Stefan-Meyer-Institut fu¨r Subatomare Physik, O¨sterreichische Akademie der Wissenschaften, Wien 1090, Austria.
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Diermaier
CERN, Gene`ve 1211, Switzerland.
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Federmann
1] Dipartimento di Ingegneria dell'Informazione, Universita` di Brescia, Brescia 25133, Italy [2] Istituto Nazionale di Fisica Nucleare, Gruppo Collegato di Brescia, Brescia 25133, Italy.
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Leali
1] Stefan-Meyer-Institut fu¨r Subatomare Physik, O¨sterreichische Akademie der Wissenschaften, Wien 1090, Austria [2] Present address: CERN, Gene`ve 1211, Switzerland.
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Malbrunot
1] Dipartimento di Ingegneria dell'Informazione, Universita` di Brescia, Brescia 25133, Italy [2] Istituto Nazionale di Fisica Nucleare, Gruppo Collegato di Brescia, Brescia 25133, Italy.
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Mascagna
Stefan-Meyer-Institut fu¨r Subatomare Physik, O¨sterreichische Akademie der Wissenschaften, Wien 1090, Austria.
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Massiczek
Department of Physics, Tokyo University of Science, Tokyo 162-8601, Japan.
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Michishio
Institute of Physics, Graduate School of Arts and Sciences, University of Tokyo, Tokyo 153-8902, Japan.
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Mizutani
Atomic Physics Laboratory, RIKEN, Saitama 351-0198, Japan.
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Mohri
Institute of Physics, Graduate School of Arts and Sciences, University of Tokyo, Tokyo 153-8902, Japan.
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Nagahama
Institute of Physics, Graduate School of Arts and Sciences, University of Tokyo, Tokyo 153-8902, Japan.
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Ohtsuka
Atomic Physics Laboratory, RIKEN, Saitama 351-0198, Japan.
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Radics
Graduate School of Advanced Sciences of Matter, Hiroshima University, Hiroshima 739-8530, Japan.
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Sakurai
Stefan-Meyer-Institut fu¨r Subatomare Physik, O¨sterreichische Akademie der Wissenschaften, Wien 1090, Austria.
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Sauerzopf
Stefan-Meyer-Institut fu¨r Subatomare Physik, O¨sterreichische Akademie der Wissenschaften, Wien 1090, Austria.
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Suzuki
Institute of Physics, Graduate School of Arts and Sciences, University of Tokyo, Tokyo 153-8902, Japan.
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Tajima
Institute of Physics, Graduate School of Arts and Sciences, University of Tokyo, Tokyo 153-8902, Japan.
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Torii
1] Dipartimento di Ingegneria dell'Informazione, Universita` di Brescia, Brescia 25133, Italy [2] Istituto Nazionale di Fisica Nucleare, Gruppo Collegato di Brescia, Brescia 25133, Italy.
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Venturelli
Stefan-Meyer-Institut fu¨r Subatomare Physik, O¨sterreichische Akademie der Wissenschaften, Wien 1090, Austria.
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Wünschek
Stefan-Meyer-Institut fu¨r Subatomare Physik, O¨sterreichische Akademie der Wissenschaften, Wien 1090, Austria.
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Zmeskal
Dipartimento di Ingegneria dell'Informazione, Universita` di Brescia, Brescia 25133, Italy.
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Zurlo
Graduate School of Advanced Sciences of Matter, Hiroshima University, Hiroshima 739-8530, Japan.
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Higaki
Atomic Physics Laboratory, RIKEN, Saitama 351-0198, Japan.
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Kanai
1] Dipartimento di Ingegneria dell'Informazione, Universita` di Brescia, Brescia 25133, Italy [2] Istituto Nazionale di Fisica Nucleare, Gruppo Collegato di Brescia, Brescia 25133, Italy.
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Lodi Rizzini
Department of Physics, Tokyo University of Science, Tokyo 162-8601, Japan.
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Nagashima
Institute of Physics, Graduate School of Arts and Sciences, University of Tokyo, Tokyo 153-8902, Japan.
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Matsuda
Stefan-Meyer-Institut fu¨r Subatomare Physik, O¨sterreichische Akademie der Wissenschaften, Wien 1090, Austria.
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Widmann
1] Institute of Physics, Graduate School of Arts and Sciences, University of Tokyo, Tokyo 153-8902, Japan [2] Atomic Physics Laboratory, RIKEN, Saitama 351-0198, Japan.
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Yamazaki