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Coherent spectroscopy with a single antiproton spin
/ BASE Collaboration
Coherent quantum transition spectroscopy is a powerful tool in metrology, quantum information processing, magnetometry and precision tests of the standard model. It was applied with great success in proton and deuteron magnetic moment measurements, which culminated in maser spectroscopy with sub-parts-per-trillion resolution and many other experiments at the forefront of physics. [...]
2025 - 11 p.
Fulltext from Publisher: PDF; External link: Interactions.org
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Proton transport from the antimatter factory of CERN
/ Leonhardt, M (Heinrich Heine U., Dusseldorf ; Wako, RIKEN) ; Schweitzer, D (Heinrich Heine U., Dusseldorf ; Mainz U., Inst. Phys.) ; Abbass, F (Heinrich Heine U., Dusseldorf ; Mainz U., Inst. Phys.) ; Anjum, K K (Darmstadt, GSI) ; Arndt, B (Darmstadt, GSI ; Heidelberg, Max Planck Inst.) ; Erlewein, S (Heinrich Heine U., Dusseldorf ; CERN) ; Endoh, S (Wako, RIKEN ; U. Tokyo (main)) ; Geissler, P (Wako, RIKEN) ; Imamura, T (Leibniz U., Hannover ; Braunschweig, Phys. Tech. Bund.) ; Jäger, J I (Heidelberg, Max Planck Inst. ; CERN) et al.
Precision measurements using low-energy antiprotons, exclusively available at the antimatter factory (AMF) of CERN$^{1}$, offer stringent tests of charge–parity–time (CPT) invariance, which is a fundamental symmetry in the Standard Model of particle physics$^{2}$. These tests have been realized, for example, in antiprotonic helium$^{3}$ and antihydrogen$^{4}$. [...]
2025 - 10 p.
- Published in : Nature 641 (2025) 871-875
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A 16 Parts per Trillion Comparison of the Antiproton-to-Proton q/m Ratios
/ Borchert, M.J. (RIKEN (main) ; Leibniz U., Hannover ; Braunschweig, Phys. Tech. Bund.) ; Devlin, J.A. (RIKEN (main) ; CERN) ; Erlewein, S.E. (RIKEN (main) ; CERN ; Heidelberg, Max Planck Inst.) ; Fleck, M. (RIKEN (main) ; Tokyo U., Komaba) ; Harrington, J.A. (RIKEN (main) ; Heidelberg, Max Planck Inst.) ; Higuchi, T. (RIKEN (main) ; Tokyo U., Komaba) ; Latacz, B. (RIKEN (main)) ; Voelksen, F. (RIKEN (main) ; Darmstadt, GSI) ; Wursten, E. (RIKEN (main) ; CERN ; Heidelberg, Max Planck Inst.) ; Abbass, F. (Mainz U., Inst. Phys.) et al.
The Standard Model (SM) of particle physics is both incredibly successful and glaringly incomplete. [...]
arXiv:2311.16006.
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5.
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Ultra-thin polymer foil cryogenic window for antiproton deceleration and storage
/ Latacz, B.M. (CERN ; RIKEN (main)) ; Arndt, B.P. (Heidelberg, Max Planck Inst. ; Darmstadt, GSI) ; Devlin, J.A. (CERN ; RIKEN (main)) ; Erlewein, S.R. (RIKEN (main) ; Heidelberg, Max Planck Inst.) ; Fleck, M. (RIKEN (main) ; Tokyo U., Komaba) ; Jäger, J.I. (CERN ; RIKEN (main) ; Heidelberg, Max Planck Inst.) ; Micke, P. (CERN ; RIKEN (main) ; Heidelberg, Max Planck Inst.) ; Umbrazunas, G. (RIKEN (main) ; Zurich, ETH) ; Wursten, E. (RIKEN (main)) ; Abbass, F. (Mainz U., Inst. Phys.) et al.
We present the design and characterisation of a cryogenic window based on an ultra-thin aluminised PET foil at T < 10K, which can withstand a pressure difference larger than 1bar at a leak rate < $1\times 10^{-9}$ mbar$\cdot$ l/s. Its thickness of approximately 1.7 $\mu$m makes it transparent to various types of particles over a broad energy range. [...]
arXiv:2308.12873.-
2023-10-01 - 11 p.
- Published in : Rev. Sci. Instrum. 94 (2023) 103310
Fulltext: Publication - PDF; 2308.12873 - PDF;
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Trap-integrated fluorescence detection with silicon photomultipliers for sympathetic laser cooling in a cryogenic Penning trap
/ Wiesinger, M. (Heidelberg, Max Planck Inst.) ; Stuhlmann, F. (Mainz U., Inst. Phys.) ; Bohman, M. (Heidelberg, Max Planck Inst.) ; Micke, P. (Heidelberg, Max Planck Inst. ; CERN) ; Will, C. (Heidelberg, Max Planck Inst.) ; Yildiz, H. (Mainz U., Inst. Phys.) ; Abbass, F. (Mainz U., Inst. Phys.) ; Arndt, B.P. (Heidelberg, Max Planck Inst. ; Darmstadt, GSI ; Wako, RIKEN) ; Devlin, J.A. (CERN ; Wako, RIKEN) ; Erlewein, S. (Heidelberg, Max Planck Inst. ; Wako, RIKEN) et al.
We present a fluorescence-detection system for laser-cooled 9Be+ ions based on silicon photomultipliers (SiPM) operated at 4 K and integrated into our cryogenic 1.9 T multi-Penning-trap system. Our approach enables fluorescence detection in a hermetically-sealed cryogenic Penning-trap chamber with limited optical access, where state-of-the-art detection using a telescope and photomultipliers at room temperature would be extremely difficult. [...]
arXiv:2308.02365.-
2023-12-01 - 12 p.
- Published in : Rev. Sci. Instrum. 94 (2023) 123202
Fulltext: 2308.02365 - PDF; document - PDF;
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BASE—high-precision comparisons of the fundamental properties of protons and antiprotons
/ Latacz, B M (RIKEN (main) ; CERN) ; Arndt, B P (RIKEN (main) ; Heidelberg, Max Planck Inst. ; Darmstadt, GSI) ; Bauer, B B (RIKEN (main) ; Mainz U., Inst. Phys.) ; Devlin, J A (RIKEN (main) ; CERN) ; Erlewein, S R (RIKEN (main) ; Heidelberg, Max Planck Inst.) ; Fleck, M (RIKEN (main) ; Tokyo U., Math. Sci.) ; Jäger, J I (RIKEN (main) ; CERN ; Heidelberg, Max Planck Inst.) ; Schiffelholz, M (RIKEN (main) ; Leibniz U., Hannover) ; Umbrazunas, G (RIKEN (main) ; ETH, Zurich (main)) ; Wursten, E J (RIKEN (main)) et al.
The BASE collaboration at the antiproton decelerator/ELENA facility of CERN compares the fundamental properties of protons and antiprotons with ultra-high precision. Using advanced Penning trap systems, we have measured the proton and antiproton magnetic moments with fractional uncertainties of 300 parts in a trillion (p.p.t.) and 1.5 parts in a billion (p.p.b.), respectively [...]
2023 - 8 p.
- Published in : Eur. Phys. J. D 77 (2023) 94
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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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BASE-STEP: A transportable antiproton reservoir for fundamental interaction studies
/ Smorra, C. (Mainz U., Inst. Phys. ; Wako, RIKEN) ; Abbass, F. (Mainz U., Inst. Phys.) ; Schweitzer, D. (Mainz U., Inst. Phys.) ; Bohman, M. (Wako, RIKEN ; Heidelberg, Max Planck Inst.) ; Dutheil, Y. (CERN) ; Hobl, A. (Babcock Noell, Wuerzburg) ; Popper, D. (Mainz U., Inst. Phys.) ; Arndt, B. (Wako, RIKEN ; Heidelberg, Max Planck Inst. ; Darmstadt, GSI) ; Bauer, B.B. (Mainz U., Inst. Phys. ; Wako, RIKEN) ; Devlin, J.A. (Wako, RIKEN ; CERN) et al.
Currently, the only worldwide source of low-energy antiprotons is the AD/ELENA facility located at CERN. To date, all precision measurements on single antiprotons have been conducted at this facility and provide stringent tests of the fundamental interactions and their symmetries. [...]
arXiv:2304.09555.-
2023-11-01 - 14 p.
- Published in : Rev. Sci. Instrum. 94 (2023) 113201
Fulltext: PDF;
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