1.
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A source of antihydrogen for in-flight hyperfine spectroscopy
/ Kuroda, N (U. Tokyo Komaba, Inst. Phys.) ; Ulmer, S (RIKEN) ; Murtagh, D J (Atomic Phys. Lab., RIKEN) ; Van Gorp, S (Atomic Phys. Lab., RIKEN) ; Nagata, Y (Atomic Phys. Lab., RIKEN) ; Diermaier, M (Stefan Meyer Inst. Subatomare Phys.) ; Federmann, S (CERN) ; Leali, M (U. Brescia ; INFN, Brescia) ; Malbrunot, C (Stefan Meyer Inst. Subatomare Phys.) ; Mascagna, V (U. Brescia ; INFN, Brescia) et al.
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. [...]
2014
- Published in : Nature Commun. 5 (2014) 3089
NPG Open Access article: PDF;
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2.
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The development of the antihydrogen beam detector and the detection of the antihydrogen atoms for in-flight hyperfine spectroscopy
/ Nagata, Y (Wako, RIKEN) ; Sauerzopf, C (Stefan Meyer Inst. Subatomare Phys.) ; Capon, A (Stefan Meyer Inst. Subatomare Phys.) ; Kuroda, N (Tokyo, U. Earth Sci. Astron.) ; Abo, Y ; Diermaier, M (Stefan Meyer Inst. Subatomare Phys.) ; Dupre, P (Wako, RIKEN) ; Higashi, Y (Tokyo, U. Earth Sci. Astron.) ; Ishikawa, S (Tokyo, U. Earth Sci. Astron.) ; Kaga, C (ADSM, Hiroshima) et al.
We have been developing ground-state antihydrogen atomic beams to test CPT symmetry via in-flight hyperfine spectroscopy. A new antihydrogen beam detector has been developed. [...]
2015 - 1 p.
- Published in : J. Phys.: Conf. Ser. 635 (2015) 022061
IOP Open Access article: PDF;
In : 29th International Conference on Photonic, Electronic, and Atomic Collisions, Toledo, Spain, 22 - 28 July 2015, pp.022061
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3.
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Towards a spin polarized antihydrogen beam
/ Kuroda, N (Tokyo U., Komaba) ; Ulmer, S (Nishina Ctr., RIKEN) ; Murtagh, D J (Nishina Ctr., RIKEN) ; Gorp, S (Nishina Ctr., RIKEN) ; Nagata, Y (Nishina Ctr., RIKEN) ; Diermaier, M (Stefan Meyer Inst. Subatomare Phys.) ; Federmann, S (CERN) ; Leali, M (INFN, Brescia ; Brescia U.) ; Malbrunot, C (Stefan Meyer Inst. Subatomare Phys.) ; Mascagna, V (INFN, Brescia ; Brescia U.) et al.
The ASACUSA collaboration has developed a cusp trap scheme to realize an in-flight high precision microwave spectroscopy of ground-state hyperfine splitting of antihydrogen ( H̄) for a stringent test of CPT symmetry. Cold H̄ atoms were successfullysynthesized by employing a cusp trap which consisted of a superconducting anti-Helmholtz coil and a stack of ring electrodes. [...]
2014 - 10 p.
- Published in : Hyperfine Interact. 228 (2014) 67-76
In : 11th International Conference on Low Energy Antiproton Physics, Uppsala, Sweden, 10 - 15 Jun 2013, pp.67-76
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4.
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Progress of antihydrogen beam production using a double cusp trap
/ Nagata, Y (Tokyo U. of Agric. Tech. ; Wako, RIKEN) ; Kuroda, N (U. Tokyo (main)) ; Dupre, P (Wako, RIKEN) ; Radics, B (Wako, RIKEN) ; Tajima, M (U. Tokyo (main) ; Wako, RIKEN) ; Capon, A A (Stefan Meyer Inst. Subatomare Phys.) ; Diermaier, M (Stefan Meyer Inst. Subatomare Phys.) ; Kaga, C (ADSM, Hiroshima) ; Kolbinger, B (Stefan Meyer Inst. Subatomare Phys.) ; Leali, M (INFN, Brescia ; Brescia U.) et al.
We report the progress of the $\bar{\text{H}}$ beam production experiment and recent developments of the double cusp trap to improve of the beam intensity of the $\bar{\text{H}}$ atomic beams, the ASACUSA Micromegas tracker to monitoring the antihydrogen synthesis and the antihydrogen beam detector..
2017 - 10 p.
- Published in : JPS Conf. Proc. 18 (2017) 011007
Fulltext: PDF;
In : 12th International Conference on Low Energy Antiproton Physics, Kanazawa, Japan, 6 - 11 Mar 2016, pp.011007
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5.
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Synthesis of Cold Antihydrogen in a Cusp Trap
/ Enomoto, Y (Wako, RIKEN) ; Kuroda, N (Tokyo, U.) ; Michishio, K (Tokyo U. of Sci.) ; Kim, C H (Tokyo, U.) ; Higaki,H (ADSM, Hiroshima) ; Nagata, Y (Wako, RIKEN) ; Kanai, Y (Wako, RIKEN) ; Torii, H A (Tokyo, U.) ; Corradini, M (Brescia U. ; INFN, Brescia) ; Leali, M (Brescia U. ; INFN, Brescia) et al.
We report here the first successful synthesis of cold antihydrogen atoms employing a cusp trap, which consists of a superconducting anti-Helmholtz coil and a stack of multiple ring electrodes. This success opens a new path to make a stringent test of the CPT symmetry via high precision microwave spectroscopy of ground-state hyperfine transitions of antihydrogen atoms..
2010
- Published in : Phys. Rev. Lett. 105 (2010) 243401
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6.
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The ASACUSA CUSP: an antihydrogen experiment
/ Kuroda, N (Tokyo U., Komaba) ; Ulmer, S (Wako, RIKEN) ; Murtagh, D J (Wako, RIKEN) ; Gorp, S (Wako, RIKEN) ; Nagata, Y (Wako, RIKEN ; Tokyo U. of Agric. Tech.) ; Diermaier, M (Stefan Meyer Inst. Subatomare Phys.) ; Federmann, S (CERN) ; Leali, M (INFN, Brescia ; Brescia U.) ; Malbrunot, C (CERN) ; Mascagna, V (INFN, Brescia ; Brescia U.) et al.
In order to test CPT symmetry between antihydrogen and its counterpart hydrogen, the ASACUSA collaboration plans to perform high precision microwave spectroscopy of ground-state hyperfine splitting of antihydrogen atom in-flight. We have developed an apparatus (“cusp trap”) which consists of a superconducting anti-Helmholtz coil and multiple ring electrodes. [...]
2015 - 8 p.
- Published in : Hyperfine Interact. 235 (2015) 13-20
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7.
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The development of the antihydrogen beam detector: Toward the three dimensional tracking with a BGO crystal and a hodoscope
/ Nagata, Y (Tokyo U. of Agric. Tech. ; Wako, RIKEN) ; Kuroda, N (Tokyo, U. Earth Sci. Astron.) ; Sauerzopf, C (Stefan Meyer Inst. Subatomare Phys.) ; Kolbinger, B (Stefan Meyer Inst. Subatomare Phys.) ; Malbrunot, C (CERN ; Stefan Meyer Inst. Subatomare Phys.) ; Capon, A A (Stefan Meyer Inst. Subatomare Phys.) ; Dupre, P (Wako, RIKEN) ; Radics, B (Wako, RIKEN) ; Tajima, M (Tokyo, U. Earth Sci. Astron. ; Wako, RIKEN) ; Kaga, C (ADSM, Hiroshima) et al.
We developed an antihydrogen beam detector for the microwave spectroscopy of the antihydrogen hyperfine splitting. The detector consists of a position sensitive BGO calorimeter and a hodoscope. [...]
2017 - 6 p.
- Published in : JPS Conf. Proc. 18 (2017) 011038
Fulltext: PDF;
In : 12th International Conference on Low Energy Antiproton Physics, Kanazawa, Japan, 6 - 11 Mar 2016, pp.011038
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8.
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The ASACUSA antihydrogen and hydrogen program : results and prospects
/ Malbrunot, C. (CERN ; Stefan Meyer Inst. Subatomare Phys.) ; Amsler, C. (Stefan Meyer Inst. Subatomare Phys.) ; Arguedas Cuendi, S. (Stefan Meyer Inst. Subatomare Phys.) ; Breuker, H. (Nishina Ctr., RIKEN) ; Dupre, P. (Nishina Ctr., RIKEN) ; Fleck, M. (Stefan Meyer Inst. Subatomare Phys.) ; Higaki, H. (ADSM, Hiroshima) ; Kanai, Y. (Nishina Ctr., RIKEN) ; Kolbinger, B. (Stefan Meyer Inst. Subatomare Phys.) ; Kuroda, N. (Tokyo U., Komaba) et al.
The goal of the ASACUSA-CUSP collaboration at the Antiproton Decelerator of CERN is to measure the ground-state hyperfine splitting of antihydrogen using an atomic spectroscopy beamline. A milestone was achieved in 2012 through the detection of 80 antihydrogen atoms 2.7 meters away from their production region. [...]
arXiv:1710.03288.-
2018-03-28 - 16 p.
- Published in : Philos. Trans. R. Soc. Lond. 376 (2018) 20170273
Fulltext: arXiv:1710.03288 - PDF; 20170273.full - PDF;
In : Antiproton Physics in the ELENA Era : Theo Murphy meeting, Newport Pagnell, Buckinghamshire, UK, 4 - 5 Sep 2017, pp.20170273
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9.
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Monte-Carlo based performance assessment of ASACUSA's antihydrogen detector
/ Nagata, Y. (Tokyo U. of Sci. ; RIKEN (main)) ; Kuroda, N. (Tokyo U., Komaba) ; Kolbinger, B. (Stefan Meyer Inst. Subatomare Phys.) ; Fleck, M. (Stefan Meyer Inst. Subatomare Phys.) ; Malbrunot, C. (Stefan Meyer Inst. Subatomare Phys. ; CERN) ; Mäckel, V. (Stefan Meyer Inst. Subatomare Phys.) ; Sauerzopf, C. (Stefan Meyer Inst. Subatomare Phys.) ; Simon, M.C. (Stefan Meyer Inst. Subatomare Phys.) ; Tajima, M. (Tokyo U., Komaba) ; Zmeskal, J. (Stefan Meyer Inst. Subatomare Phys.) et al.
An antihydrogen detector consisting of a thin BGO disk and a surrounding plastic scintillator hodoscope has been developed. We have characterized the two-dimensional positions sensitivity of the thin BGO disk and energy deposition into the BGO was calibrated using cosmic rays by comparing experimental data with Monte-Carlo simulations. [...]
arXiv:1806.00959.-
2018-12-01 - 6 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 910 (2018) 90-95
Fulltext: 1806.00959 - PDF; 10.1016_j.nima.2018.09.013 - PDF;
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10.
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Towards Measuring the Ground State Hyperfine Splitting of Antihydrogen -- A Progress Report
/ Sauerzopf, C. (Stefan Meyer Inst. Subatomare Phys.) ; Capon, A.A. (Stefan Meyer Inst. Subatomare Phys.) ; Diermaier, M. (Stefan Meyer Inst. Subatomare Phys.) ; Dupré, P. (Wako, RIKEN) ; Higashi, Y. (Tokyo U., Komaba) ; Kaga, C. (ADSM, Hiroshima) ; Kolbinger, B. (Stefan Meyer Inst. Subatomare Phys.) ; Leali, M. (Brescia U. ; INFN, Pavia) ; Lehner, S. (Stefan Meyer Inst. Subatomare Phys.) ; Lodi Rizzini, E. (Brescia U. ; INFN, Pavia) et al.
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..
arXiv:1606.01791.-
2016-06-20 - 5 p.
- Published in : Hyperfine Interact. 237 (2016) 103
Fulltext: PDF; External link: Preprint
In : 6th International Symposium on Symmetries in Subatomic Physics, Victoria, Canada, 08 - 12 Jun 2015, pp.103
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