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Antihydrogen atom formation in a CUSP trap towards spin polarized beams |
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| Authors: | N Kuroda Y Enomoto K Michishio C H Kim H Higaki Y Nagata Y Kanai H A Torii M Corradini M Leali E Lodi-Rizzini L Venturelli N Zurlo K Fujii M Ohtsuka K Tanaka H Imao Y Nagashima Y Matsuda B Juhász E Widmann A Mohri Y Yamazaki |
| Institution: | 1. Graduate School of Arts and Sciences, University of Tokyo, 3-8-1 Komaba Meguro-ku, 153-8902, Tokyo, Japan 2. RIKEN Advanced Science Institute, 2-1 Hirosawa Wako-shi, 351-0198, Saitama, Japan 4. Department of Physics, Tokyo University of Science, Kagurazaka Shinjuku-ku, 162-8601, Tokyo, Japan 5. Graduate School of Advanced Science of Matter, Hiroshima University, Kagamiyama, Higashi-Hiroshima, 739-8530, Hiroshima, Japan 6. Dipartimento di Chimica e Fisica per l’Ingegneria e per i Materiali, Università di Brescia & Instituto Nazionale di Fisica Nucleare, Gruppo Collegato di Brescia, 25133, Brescia, Italy 3. RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa Wako-shi, 351-0198, Saitama, Japan 7. Stefan Meyer Institut für Subatomare Physik, Boltzmangasse 3, 1090, Wien, Austria |
| Abstract: | The ASACUSA collaboration has been making a path to realize high precision microwave spectroscopy of ground-state hyperfine transitions of antihydrogen atom in flight for stringent test of the CPT symmetry. For this purpose, an efficient extraction of a spin polarized antihydrogen beam is essential. In 2010, we have succeeded in synthesizing our first cold antihydrogen atoms employing a CUSP trap. The CUSP trap confines antiprotons and positrons simultaneously with its axially symmetric magnetic field to form antihydrogen atoms. It is expected that antihydrogen atoms in the low-field-seeking states are preferentially focused along the cusp magnetic field axis whereas those in the high-field-seeking states are defocused, resulting in the formation of a spin-polarized antihydrogen beam. |
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