M. Leali

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.

Towards measuring the ground state hyperfine splitting of antihydrogen – a progress report

We report the successful commissioning and testing of a dedicated field-ioniser chamber for measuring principal quantum number distributions in antihydrogen as part of the ASACUSA hyperfine spectroscopy apparatus. The new chamber is combined with a beam normalisation detector that consists of plastic scintillators and a retractable passivated implanted planar silicon (PIPS) detector.

Antihydrogen Synthesis in a Double-Cusp Trap

Naofumi Kuroda1, Minori Tajima1,2, Balint Radics2, Pierre Dupré2, Yugo Nagata3, Chikato Kaga4, Yasuyuki Kanai2, Marco Leali5,6, Evandro Lodi Rizzini5,6, Valerio Mascagna5,6, Takuya Matsudate1, Horst Breuker7, Hiroyuki Higaki4, Yasuyuki Matsuda1, Stefan Ulmer8, Luca Venturelli5,6, and Yasunori Yamazaki2 1Institute of Physics, Graduate School of Arts and Sciences, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8901, Japan 2Atomic Physics Research Unit, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan 3Department of Applied Physics, Tokyo Univeristy of Agriculture and Technology, 2-24-16 Nakacho, Koganei-shi, Tokyo 184-8588, Japan 4Graduate School of Advanced Sciences of Matter, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8530, Japan 5Dipartmento di Ingegneria dell’Informazione, Università di Brescia, Brescia 25133, Italy 6INFN, Gruppo Collegato di Brescia, Brescia 25133, Italy 7CERN, Genève 1211, Switzerland 8Ulmer Initiative Research Unit, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan

Physical Society of Japan : Manipulation and transport of antiprotons for an efficient production of antihydrogen atoms

Minori Tajima1,2, Naofumi Kuroda1, Pierre Dupre2, Yugo Nagata2,3, Balint Radics2, Takuya Matsudate1, Marco Leali4, Valerio Mascagna4, Luca Venturelli4, Horst Breuker5, Hiroyuki Higaki6, Yasuyuki Kanai2, Evandro Lodi Rizzini4, Yasuyuki Matsuda1, Stefan Ulmer7 and Yasunori Yamazaki2 1The University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo 153-8902, Japan 2Atomic Physics Research Unit, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan 3Department of Applied Physics, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan 4University of Brescia, 15 Piazza del Mercato, Brescia BS 25121, Italy 5CERN, 23 Geneva, CH 1211, Switzerland 6Hiroshima University, 1-2-3 Kagamiyama, Higashihiroshima, Hiroshima 739-8530, Japan 7Ulmer Initiative Research Unit, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan

Measurements and 3D Reconstruction of Antimatter Annihilations with the ASACUSA Micromegas Tracker

B. Radics1,2, H. Breuker3, P. Dupre1, Y. Higashi4, C. Kaga5, M. Leali6, E. Lodi Rizzini6, V. Mascagna6, T. Matsudate4, D.J. Murtagh1, M. Tajima4, H.A. Torii4, S. Van Gorp1, H. Higaki5, T.Y. Kanai1, N. Kuroda4, Y. Matsuda4, S. Ulmer1, L. Venturelli6, Y. Yamazaki1,4 1Atomic Physics Laboratory, RIKEN, Saitama 351-0198, Japan 2ETH Zurich, Institute for Particle Physics, CH-8093 Zürich, Switzerland 3CERN, Genéve 1211, Switzerland 4Graduate School of Arts and Sciences, University of Tokyo, Tokyo 153-8902, Japan 5Graduate School of Advanced Sciences of Matter, Hiroshima University, Hiroshima 739-8530, Japan 6Dipartimento di Ingegneria dell’Informazione, Università di Brescia & INFN, Gruppo Collegato di Brescia, 25133, Brescia, Italy 7Department of Applied Physics, Tokyo University of Agriculture and Technology, Tokyo, 184-8588, Japan

Beam diagnostics for measurements of in-flight annihilation cross sections of antiprotons at 130 keV

Hossein Aghai-Khozani1,2, Daniel Barna3,4, Maurizio Corradini5,6, Ryugo Hayano4, Masaki Hori1,4, Takumi Kobayashi4, Marco Leali5,6, Evandro Lodi-Rizzini5,6, Valerio Mascagna5,6, Michela Prest7,8, Anna Soter1, Koichi Todoroki4, Erik Vallazza9, Luca Venturelli5,6, and Nicola Zurlo5,6 1Max-Planck-Institut fur Quantenoptik, Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany 2Physics Department, CERN, 1211 Geneva 23, Switzerland 3Wigner Institute for Particle and Nuclear Physics, H-1525 Budapest, Hungary 4Department of Physics, University of Tokyo, Hongo7-3-1, Bunkyo-ku, Tokyo 113-0033, Japan 5Dipartimento di Collegato di Brescia, 25133 Brescia, Italy 6INFN, Gruppo Collegato di Brescia, 25133 Brescia, Italy 7Dipartimento di Scienze Fisiche e Matematiche, Universita di Como, I-22100 Como, Italy 8INFN, Sezione di Milano Bicocca, I-20126 Milano, Italy 9INFN, Sezione di Trieste, I-34127 Trieste, Italy

Towards the production of anti-hydrogen beams

Recently, the production of low energy anti-hydrogen atoms in the cusp trap with the use of 150eV antiproton beams from the MUSASHI trap was reported. The purpose of producing low energy anti-hydrogen atoms in a cusped magnetic field is to extract a polarized anti-hydrogen beam to a field free region, so that the hyperfine structure of anti-hydrogen atoms can be measured.

Antiproton-nucleus annihilation at very low energies down to capture

Results and opportunities at the low energies antiproton facilities at CERN (AD) are presented.