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1.
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The Gbar project, or how does antimatter fall?
/ Indelicato, Paul (Paris, Lab. Kastler Brossel) ; Chardin, G (CSNSM, Orsay) ; Grandemange, P (CSNSM, Orsay) ; Lunney, D (CSNSM, Orsay) ; Manea, V (CSNSM, Orsay) ; Badertscher, A (Zurich, ETH) ; Crivelli, P (Zurich, ETH) ; Curioni, A (Zurich, ETH) ; Marchionni, A (Zurich, ETH) ; Rossi, B (Zurich, ETH) et al.
The Einstein classical Weak Equivalence Principle states that the trajectory of a particle is independent of its composition and internal structure when it is only submitted to gravitational forces. This fundamental principle has never been directly tested with antimatter. [...]
2014 - 10 p.
- Published in : Hyperfine Interact. 228 (2014) 141-150
In : 11th International Conference on Low Energy Antiproton Physics, Uppsala, Sweden, 10 - 15 Jun 2013, pp.141-150
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2.
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Measurement of the Principal Quantum Number Distribution in a Beam of Antihydrogen Atoms
/ Kolbinger, B. (Stefan Meyer Inst. Subatomare Phys. ; CERN) ; Amsler, C. (Stefan Meyer Inst. Subatomare Phys.) ; Cuendis, S. Arguedas (Stefan Meyer Inst. Subatomare Phys. ; CERN) ; Breuker, H. (RIKEN (main)) ; Capon, A. (Stefan Meyer Inst. Subatomare Phys.) ; Costantini, G. (U. Brescia ; INFN, Pavia) ; Dupré, P. (RIKEN (main)) ; Fleck, M. (Tokyo U., Komaba) ; Gligorova, A. (Stefan Meyer Inst. Subatomare Phys.) ; Higaki, H. (Hiroshima U. (main)) et al.
The ASACUSA (Atomic Spectroscopy And Collisions Using Slow Antiprotons) collaboration plans to measure the ground-state hyperfine splitting of antihydrogen in a beam at the CERN Antiproton Decelerator with initial relative precision of 10-6 or better, to test the fundamental CPT (combination of charge conjugation, parity transformation and time reversal) symmetry between matter and antimatter. This challenging goal requires a polarised antihydrogen beam with a sufficient number of antihydrogen atoms in the ground state. [...]
arXiv:2008.04246.-
2021-03-08 - 14 p.
- Published in : Eur. Phys. J. D 75 (2021) 91
Fulltext: PDF; Fulltext from Publisher: PDF; Fulltext from publisher: PDF;
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3.
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Measurements and 3D reconstruction of antimatter annihilations with the ASACUSA Micromegas Tracker
/ Radics, B (RIKEN (main) ; Zurich, ETH) ; Breuker, H (CERN) ; Dupre, P (RIKEN (main)) ; Higashi, Y (U. Tokyo (main)) ; Kaga, C (ADSM, Hiroshima) ; Leali, M (INFN, Brescia ; Brescia U.) ; Lodi Rizzini, E (INFN, Brescia ; Brescia U.) ; Mascagna, V (INFN, Brescia ; Brescia U.) ; Matsudate, T (U. Tokyo (main)) ; Murtagh, D J (RIKEN (main)) et al.
The aim of the ASACUSA-CUSP experiment is to form a beam of antihydrogen atoms for in-flight precision spectroscopic measurements. This is performed by trapping and mixing antiprotons and positrons in a common nested-well potential, which is sitting in a double-cusp magnetic field with minimum-B field configuration. [...]
2017 - 6 p.
- Published in : JPS Conf. Proc. 18 (2017) 011010
Fulltext: PDF;
In : 12th International Conference on Low Energy Antiproton Physics, Kanazawa, Japan, 6 - 11 Mar 2016, pp.011010
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4.
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Direct detection of antihydrogen atoms using a BGO crystal
/ Nagata, Y (Tokyo U. of Agric. Tech. ; Wako, RIKEN) ; Kuroda, N (Tokyo U., Komaba ; Wako, RIKEN) ; Ohtsuka, M (Tokyo U., Komaba) ; Leali, M (Brescia U. ; INFN, Brescia) ; Lodi-Rizzini, E (Brescia U. ; INFN, Brescia) ; Mascagna, V (Brescia U. ; INFN, Brescia) ; Tajima, M (Tokyo U., Komaba ; Wako, RIKEN) ; Torii, H A (Tokyo U., Komaba ; Wako, RIKEN) ; Zurlo, N (Brescia U. ; INFN, Brescia) ; Matsuda, Y (Tokyo U., Komaba ; Wako, RIKEN) et al.
The ASACUSA collaboration has developed a detector consisting of a large size BGO crystal to detect an atomic antihydrogen beam, and performed the direct detection of antihydrogen atoms. Energy spectra from antihydrogen annihilation on the BGO crystal are discussed in comparison to simulation results from the GEANT4 toolkit. [...]
2016 - 7 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 840 (2016) 153-159
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5.
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Collisional and Spectroscopic Studies of Exotic Atoms Using Ultra-Slow Antiprotons
/ Torii, H A (Tokyo U., Komaba) ; Nagata, Y (Tokyo U., Komaba ; RIKEN (main)) ; Toyoda, H (Tokyo U., Komaba) ; Imao, H (RIKEN (main)) ; Kuroda, N ; Varentsov, V L (Moscow, ITEP) ; Yamazaki, Y (Tokyo U., Komaba ; RIKEN (main))
/ASACUSA
Antiproton, the antiparticle of proton, is a unique projectile in the study of atomic collision physics, which can be treated theoretically either as a `negative proton' or a `heavy electron'. Atomic capture of an antiproton will result in formation of a highly excited exotic atom. [...]
2009 - 6 p.
- Published in : AIP Conf. Proc. 1150 (2009) 84-89
External link: AIP Conference Proceedings
In : 3rd International meeting on frontiers of physics, Awana Genting, Malaysia, 12 - 16 Jan 2009, pp.84-89
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6.
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Atomic collision experiment using ultra-slow antiproton beams
/ Torii, Hiroyuki A (Tokyo U., Komaba) ; Kuroda, N (RIKEN (main)) ; Shibata, M (RIKEN (main)) ; Imao, H (RIKEN (main)) ; Nagata, Y (Tokyo U., Komaba ; RIKEN (main)) ; Barna, D (CERN) ; Hori, M (CERN) ; Kanai, Y (RIKEN (main)) ; Mohri, A (RIKEN (main)) ; Varentsov, V L (Khlopin Radium Inst.) et al.
/ASACUSA
The development of techniques to decelerate, cool and confine antiprotons in vacuo with an electromagnetic trap has opened a new research field of atomic physics of 'cold' antiprotons, including synthesis of antihydrogen atoms. At the Antiproton Decelerator (AD) facility at CERN, we the MUSASHI group of ASACUSA collaboration have so far achieved efficient confinement of millions of antiprotons in a Multi-Ring electrode Trap (MRT) installed in a superconducting magnet of 2.5 T, by a sequential combination of the AD (down to 5.3 MeV), an RFQD (Radio-Frequency Quadrupole Decelerator; down to 50–120 keV) and the MRT. [...]
2007 - 12 p.
- Published in : J. Phys.: Conf. Ser. 80 (2007) 012022
Fulltext: PDF;
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7.
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Towards a test of the weak equivalence principle of gravity using anti-hydrogen at CERN
/ Banerjee, D (ETH, Zurich (main)) ; Biraben, F (Paris, Lab. Kastler Brossel) ; Charlton, M (Swansea U.) ; Cladé, P (Paris, Lab. Kastler Brossel) ; Comini, P (CSNSM, Orsay) ; Crivelli, P (ETH, Zurich (main)) ; Dalkarov, O (Lebedev Inst.) ; Debu, P (IRFU, SPP, Saclay) ; Dodd, L (Swansea U.) ; Douillet, A (Paris, Lab. Kastler Brossel) et al.
The aim of the GBAR (Gravitational Behavior of Antimatter at Rest) experiment is to measure the free fall acceleration of an antihydrogen atom, in the terrestrial gravitational field at CERN and therefore test the Weak Equivalence Principle with antimatter. The aim is to measure the local gravity with a 1% uncertainty which can be reduced to few parts of 10-3..
2016 - 2 p.
- Published in : 10.1109/CPEM.2016.7540781
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8.
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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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9.
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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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10.
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The GBAR antimatter gravity experiment
/ Pérez, P (IRFU, SPhN, Saclay) ; Banerjee, D (Zurich, ETH) ; Biraben, F (Paris, Lab. Kastler Brossel) ; Brook-Roberge, D (IRFU, SPhN, Saclay) ; Charlton, M (Swansea U.) ; Cladé, P (Paris, Lab. Kastler Brossel) ; Comini, P (IRFU, SPhN, Saclay) ; Crivelli, P (Zurich, ETH) ; Dalkarov, O (Lebedev Inst.) ; Debu, P (IRFU, SPhN, Saclay) et al.
The GBAR project (Gravitational Behaviour of Anti hydrogen at Rest) at CERN, aims to measure the free fall acceleration of ultracold neutral anti hydrogen atoms in the terrestrial gravitational field. The experiment consists preparing anti hydrogen ions (one antiproton and two positrons) and sympathetically cooling them with Be$^{+}$ ions to less than 10 μK. [...]
2015 - 7 p.
- Published in : Hyperfine Interact. 233 (2015) 21-27
In : 5th International Conference on Exotic Atoms and Related Topics, Vienna, Austria, 15 - 19 Sep 2014, pp.21-27
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