A source of antihydrogen for in-flight hyperfine spectroscopy

N. Kuroda (), S. Ulmer, D. J. Murtagh, S. Van Gorp, Y. Nagata, M. Diermaier, S. Federmann, M. Leali, C. Malbrunot, V. Mascagna, O. Massiczek, K. Michishio, T. Mizutani, A. Mohri, H. Nagahama, M. Ohtsuka, B. Radics, S. Sakurai, C. Sauerzopf, K. Suzuki, M. Tajima, H. A. Torii, L. Venturelli, B. Wu¨nschek, J. Zmeskal, N. Zurlo, H. Higaki, Y. Kanai, E. Lodi Rizzini, Y. Nagashima, Y. Matsuda, E. Widmann and Y. Yamazaki
Additional contact information
N. Kuroda: Institute of Physics, Graduate School of Arts and Sciences, University of Tokyo
S. Ulmer: Ulmer Initiative Research Unit, RIKEN
D. J. Murtagh: Atomic Physics Laboratory, RIKEN
S. Van Gorp: Atomic Physics Laboratory, RIKEN
Y. Nagata: Atomic Physics Laboratory, RIKEN
M. Diermaier: Stefan-Meyer-Institut fu¨r Subatomare Physik, O¨sterreichische Akademie der Wissenschaften
S. Federmann: CERN
M. Leali: Universita` di Brescia
C. Malbrunot: Stefan-Meyer-Institut fu¨r Subatomare Physik, O¨sterreichische Akademie der Wissenschaften
V. Mascagna: Universita` di Brescia
O. Massiczek: Stefan-Meyer-Institut fu¨r Subatomare Physik, O¨sterreichische Akademie der Wissenschaften
K. Michishio: Tokyo University of Science
T. Mizutani: Institute of Physics, Graduate School of Arts and Sciences, University of Tokyo
A. Mohri: Atomic Physics Laboratory, RIKEN
H. Nagahama: Institute of Physics, Graduate School of Arts and Sciences, University of Tokyo
M. Ohtsuka: Institute of Physics, Graduate School of Arts and Sciences, University of Tokyo
B. Radics: Atomic Physics Laboratory, RIKEN
S. Sakurai: Graduate School of Advanced Sciences of Matter, Hiroshima University
C. Sauerzopf: Stefan-Meyer-Institut fu¨r Subatomare Physik, O¨sterreichische Akademie der Wissenschaften
K. Suzuki: Stefan-Meyer-Institut fu¨r Subatomare Physik, O¨sterreichische Akademie der Wissenschaften
M. Tajima: Institute of Physics, Graduate School of Arts and Sciences, University of Tokyo
H. A. Torii: Institute of Physics, Graduate School of Arts and Sciences, University of Tokyo
L. Venturelli: Universita` di Brescia
B. Wu¨nschek: Stefan-Meyer-Institut fu¨r Subatomare Physik, O¨sterreichische Akademie der Wissenschaften
J. Zmeskal: Stefan-Meyer-Institut fu¨r Subatomare Physik, O¨sterreichische Akademie der Wissenschaften
N. Zurlo: Universita` di Brescia
H. Higaki: Graduate School of Advanced Sciences of Matter, Hiroshima University
Y. Kanai: Atomic Physics Laboratory, RIKEN
E. Lodi Rizzini: Universita` di Brescia
Y. Nagashima: Tokyo University of Science
Y. Matsuda: Institute of Physics, Graduate School of Arts and Sciences, University of Tokyo
E. Widmann: Stefan-Meyer-Institut fu¨r Subatomare Physik, O¨sterreichische Akademie der Wissenschaften
Y. Yamazaki: Institute of Physics, Graduate School of Arts and Sciences, University of Tokyo

Nature Communications, 2014, vol. 5, issue 1, 1-6

Abstract: Abstract 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.

Date: 2014
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DOI: 10.1038/ncomms4089

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