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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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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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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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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
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A high-Q superconducting toroidal medium frequency detection system with a capacitively adjustable frequency range >180 kHz
/ Völksen, F (RIKEN (main) ; Darmstadt, GSI) ; Devlin, J A (RIKEN (main) ; CERN) ; Borchert, M J (RIKEN (main) ; Leibniz U., Hannover ; Bucharest U.) ; 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.) ; Latacz, B M (RIKEN (main) ; Heidelberg, Max Planck Inst.) ; Micke, P (RIKEN (main) ; CERN) ; Nuschke, P (RIKEN (main) ; Leibniz U., Hannover) ; Umbrazunas, G (RIKEN (main) ; ETH, Zurich (main)) et al.
We describe a newly developed polytetrafluoroethylene/copper capacitor driven by a cryogenic piezoelectric slip-stick stage and demonstrate with the chosen layout cryogenic capacitance tuning of ≈60 pF at ≈10 pF background capacitance. Connected to a highly sensitive superconducting toroidal LC circuit, we demonstrate tuning of the resonant frequency between 345 and 685 kHz, at quality factors Q > 100 000. [...]
2022 - 6 p.
- Published in : Rev. Sci. Instrum. 93 (2022) 093303
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Sympathetic cooling schemes for separately trapped ions coupled via image currents
/ Will, C. (Heidelberg, Max Planck Inst.) ; Bohman, M. (Heidelberg, Max Planck Inst. ; Wako, RIKEN) ; Driscoll, T. (Texas U.) ; Wiesinger, M. (Heidelberg, Max Planck Inst. ; Wako, RIKEN) ; Abbass, F. (Mainz U., Inst. Phys.) ; Borchert, M.J. (Wako, RIKEN ; Leibniz U., Hannover ; Braunschweig, Phys. Tech. Bund.) ; Devlin, J.A. (Wako, RIKEN ; CERN) ; Erlewein, S. (Wako, RIKEN ; CERN) ; Fleck, M. (Wako, RIKEN ; Tokyo U.) ; Latacz, B. (Wako, RIKEN) et al.
Cooling of particles to mK-temperatures is essential for a variety of experiments with trapped charged particles. However, many species of interest lack suitable electronic transitions for direct laser cooling. [...]
arXiv:2112.04818.-
2022-03-17 - 19 p.
- Published in : New J. Phys. 24 (2022) 033021
Fulltext: 2112.04818 - PDF; document - PDF;
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