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1.
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Antiproton annihilation at rest in thin solid targets and comparison with Monte Carlo simulations
/ Amsler, Claude (Stefan Meyer Inst. Subatomare Phys.) ; Breuker, Horst (Wako, RIKEN) ; Bumbar, Marcus (CERN ; Vienna U.) ; Cerwenka, Matti (Stefan Meyer Inst. Subatomare Phys. ; Vienna U.) ; Costantini, Giovanni (Brescia U. ; INFN, Brescia ; INFN, Pavia) ; Ferragut, Rafael (Milan Polytechnic ; INFN, Milan ; Milan U.) ; Fleck, Markus (Stefan Meyer Inst. Subatomare Phys.) ; Giammarchi, Marco (INFN, Milan ; Milan U.) ; Gligorova, Angela (Stefan Meyer Inst. Subatomare Phys.) ; Gosta, Giulia (Brescia U. ; INFN, Brescia ; INFN, Pavia) et al.
/Asacusa AD-3
The mechanism of antiproton-nucleus annihilation at rest is not fully understood, despite substantial previous experimental and theoretical work. In this study we used slow extracted, sub-keV antiprotons from the ASACUSA apparatus at CERN to measure the charged particle multiplicities and their energy deposits from antiproton annihilations at rest on three different nuclei: carbon, molybdenum and gold. [...]
arXiv:2407.06721.-
Geneva : CERN, 2024-11-17 - 18 p.
- Published in : Eur. Phys. J. A 60 (2024) 225
Draft (restricted): PDF; Fulltext: CERN-EP-2024-182 - PDF; document - PDF; 2407.06721 - PDF;
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2.
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Constraints on the Coupling between Axionlike Dark Matter and Photons Using an Antiproton Superconducting Tuned Detection Circuit in a Cryogenic Penning Trap
/ Devlin, Jack A. (Wako, RIKEN ; CERN) ; Borchert, Matthias J. (Wako, RIKEN ; Braunschweig, Phys. Tech. Bund. ; Leibniz U., Hannover) ; Erlewein, Stefan (Wako, RIKEN ; CERN) ; Fleck, Markus (Wako, RIKEN ; Tokyo U., Komaba) ; Harrington, James A. (Wako, RIKEN ; Heidelberg, Max Planck Inst.) ; Latacz, Barbara (Wako, RIKEN) ; Warncke, Jan (Wako, RIKEN) ; Wursten, Elise (Wako, RIKEN ; CERN) ; Bohman, Matthew A. (Wako, RIKEN ; Heidelberg, Max Planck Inst.) ; Mooser, Andreas H. (Wako, RIKEN ; Heidelberg, Max Planck Inst.) et al.
We constrain the coupling between axionlike particles (ALPs) and photons, measured with the superconducting resonant detection circuit of a cryogenic Penning trap. By searching the noise spectrum of our fixed-frequency resonant circuit for peaks caused by dark matter ALPs converting into photons in the strong magnetic field of the Penning-trap magnet, we are able to constrain the coupling of ALPs with masses around $2.7906-2.7914\,\textrm{neV/c}^2$ to $g_{a\gamma}< 1 \times 10^{-11}\,\textrm{GeV}^{-1}$. [...]
arXiv:2101.11290.-
2021-01-26 - 7 p.
- Published in : Phys. Rev. Lett. 126 (2021) 041301
Fulltext: 2101.11290 - PDF; PhysRevLett.126 - PDF;
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3.
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Superconducting solenoid system with adjustable shielding factor for precision measurements of the properties of the antiproton
/ Devlin, Jack A (RIKEN (main) ; CERN) ; Wursten, Elise (RIKEN (main) ; CERN) ; Harrington, James A (RIKEN (main) ; Heidelberg, Max Planck Inst.) ; Higuchi, Takashi (RIKEN (main) ; U. Tokyo (main)) ; Blessing, Pascal E (RIKEN (main) ; Darmstadt, GSI) ; Borchert, Matthias J (RIKEN (main) ; Leibniz U., Hannover) ; Erlewein, Stefan (RIKEN (main) ; CERN ; Heidelberg, Max Planck Inst.) ; Hansen, Jannek J (RIKEN (main)) ; Morgner, Jonathan (RIKEN (main) ; Leibniz U., Hannover) ; Bohman, Matthew A (RIKEN (main) ; Heidelberg, Max Planck Inst.) et al.
A superconducting self-shielding three-solenoid system with an adjustable shielding factor is developed, implemented, and characterized using a single antiproton in a Penning trap. With the tuned system, we suppress external magnetic field disturbances by up to a factor of 225 ± 15, allowing antiproton-to-proton charge-to-mass ratio comparisons with fourfold reduced frequency fluctuations and antiproton magnetic moment determinations with tenfold reduced uncertainty..
2019 - 9 p.
- Published in : Phys. Rev. Applied 12 (2019) 044012
Fulltext from publisher: PDF;
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4.
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Antihydrogen beams
/ Yamazaki, Yasunori
Why does our universe consist purely of matter, even though the same amount of antimatter and matter should have been produced at the moment of the Big Bang 13.8 billion years ago? One of the most potentially fruitful approaches to address the mystery is to study the properties of antihydrogen and a [...]
Bristol : IOP, 2018. - 28 p.
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ebook (Open Access)
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5.
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Manipulation and transport of antiprotons for an efficient production of antihydrogen atoms
/ Tajima, Minori (U. Tokyo (main) ; Wako, RIKEN) ; Kuroda, Naofumi (U. Tokyo (main)) ; Dupre, Pierre (Wako, RIKEN) ; Nagata, Yugo (Wako, RIKEN ; Tokyo U. of Agric. Tech.) ; Radics, Balint (Wako, RIKEN) ; Matsudate, Takuya (U. Tokyo (main)) ; Leali, Marco (U. Brescia) ; Mascagna, Valerio (U. Brescia) ; Venturelli, Luca (U. Brescia) ; Breuker, Horst (CERN) et al.
The ASACUSA collaboration is developing methods to extract and transport antiprotons at 20 eV adiabatically for an efficient production of cold antihydrogen atoms using a direct injection scheme. We successfully observed a high production rate of antihydrogen atoms immediately after the mixing of antiprotons..
2017 - 6 p.
- Published in : JPS Conf. Proc. 18 (2017) 011008
Fulltext: PDF;
In : 12th International Conference on Low Energy Antiproton Physics, Kanazawa, Japan, 6 - 11 Mar 2016, pp.011008
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6.
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A test of charge-parity-time invariance at the atto-electronvolt scale
/ Mooser, Andreas (Wako, RIKEN) ; Higuchi, Takashi (Wako, RIKEN ; Tokyo, U. Earth Sci. Astron.) ; Smorra, Christian (Wako, RIKEN ; CERN) ; Nagahama, Hiroki (Wako, RIKEN ; Tokyo, U. Earth Sci. Astron.) ; Leefer, Nathan (Helmholtz Inst., Mainz) ; Schneider, Georg (Wako, RIKEN ; Mainz U., Inst. Phys.) ; Sellner, Stefan (Wako, RIKEN) ; Blaum, Klaus (Heidelberg, Max Planck Inst.) ; Matsuda, Yasuyuki (Tokyo, U. Earth Sci. Astron.) ; Quint, Wolfgang (Darmstadt, GSI) et al.
We developed a novel fast measurement procedure for cyclotron frequency comparisons of two individual particles in a Penning trap, which enabled us to compare the charge-to-mass ratio of the proton and the antiproton with a fractional precision of 69 parts per trillion. To date this is the most precise test of charge-parity-time invariance using baryons. [...]
2017 - 9 p.
- Published in : JPS Conf. Proc. 18 (2017) 011019
Fulltext: PDF;
In : 12th International Conference on Low Energy Antiproton Physics, Kanazawa, Japan, 6 - 11 Mar 2016, pp.011019
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7.
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Antihydrogen synthesis in a double-cusp trap
/ Kuroda, Naofumi (Tokyo U., Komaba) ; Tajima, Minori (Tokyo U., Komaba ; RIKEN (main)) ; Radics, Balint (RIKEN (main)) ; Dupré, Pierre (RIKEN (main)) ; Nagata, Yugo (Tokyo U. of Agric. Tech.) ; Kaga, Chikato (ADSM, Hiroshima) ; Kanai, Yasuyuki (RIKEN (main)) ; Leali, Marco (Brescia U. ; INFN, Brescia) ; Rizzini, Evandro Lodi (Brescia U. ; INFN, Brescia) ; Mascagna, Valerio (Brescia U. ; INFN, Brescia) et al.
The ASACUSA CUSP experiment plans a high precision spectroscopy of the ground-state hyperfine splitting of antihydrogen to test CPT symmetry. To perform this, a Rabi-like antiatomic beam method has been developed with a novel double-cusp trap. [...]
2017 - 6 p.
- Published in : JPS Conf. Proc. 18 (2017) 011009
Fulltext: PDF;
In : 12th International Conference on Low Energy Antiproton Physics, Kanazawa, Japan, 6 - 11 Mar 2016, pp.011009
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8.
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A reservoir trap for antiprotons
/ BASE Collaboration
We have developed techniques to extract arbitrary fractions of antiprotons from an accumulated reservoir, and to inject them into a Penning-trap system for high-precision measurements. In our trap-system antiproton storage times > 1.08 years are estimated. [...]
arXiv:1507.04147.-
2015-08-17 - 4 p.
- Published in : Int. J. Mass Spectrometry 389 (2015) 10–13
Fulltext: PDF; External link: Preprint
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9.
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Autoresonant Excitation of Antiproton Plasmas
/ ALPHA Collaboration
We demonstrate controllable excitation of the center-of-mass longitudinal motion of a thermal antiproton plasma using a swept-frequency autoresonant drive. When the plasma is cold, dense, and highly collective in nature, we observe that the entire system behaves as a single-particle nonlinear oscillator, as predicted by a recent theory. [...]
2011
- Published in : Phys. Rev. Lett. 106 (2011) 025002
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10.
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Towards Antihydrogen Trapping and Spectroscopy at ALPHA
/ Butler, Eoin (Swansea U.) ; Andresen, Gorm B. (Aarhus U.) ; Ashkezari, Mohammad D. (Simon Fraser U.) ; Baquero-Ruiz, Marcelo (UCLA) ; Bertsche, William (Swansea U.) ; Bowe, Paul D. (Aarhus U.) ; Bray, Crystal C. (UCLA) ; Cesar, Claudio L. (Rio de Janeiro Federal U.) ; Chapman, Steven (UCLA) ; Charlton, Michael (Swansea U.) et al.
Spectroscopy of antihydrogen has the potential to yield high-precision tests of the CPT theorem and shed light on the matter-antimatter imbalance in the Universe. The ALPHA antihydrogen trap at CERN's Antiproton Decelerator aims to prepare a sample of antihydrogen atoms confined in an octupole-based Ioffe trap and to measure the frequency of several atomic transitions. [...]
arXiv:1105.0037.-
2011 - 10 p.
- Published in : Hyperfine Interact. 199 (2011) 39-48
Fulltext: PDF; External link: Preprint
In : 5th International Conference on Trapped Charged Particles and Fundamental Physics, Tunturihotelli in Saariselkä, Finland, 12 - 16 Apr 2010, pp.39-48
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