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Publikationen

Selected important publications

2025

  1. Caravita, R., Mathad, A. C., Hangst, J. S., Hori, M., Latacz, B. M., Obertelli, A., Perez, P., Ulmer, S., & Widmann, E. (2025). 

    CERN AD/ELENA Antimatter Program [Preprint]. arXiv. https://arxiv.org/abs/2503.22471

     

  2. Alemany Fernandez, R., Mackowiak-Pawlowska, M., Brugger, M., Ponce, L., Gschwendtner, E., Schulthess, I., Kahlhoefer, Charitonidis, N. (2025). 

    Summary report of the Physics Beyond Colliders study at CERN (CERN-PBC-REPORT-2025-003). CERN.

     

  3. Ulmer, S., Latacz, B., Erlewein, S., Fleck, M., Jaeger, J., Arndt, B., Wursten, E., Abbass, F., Devlin, J., Geissler, P., Imamura, T., Leonhardt, M., Mooser, A., Schweitzer, D., Voelksen, F., Yildiz, H., Blaum, K., Matsuda, Y., Ospelkaus, C., Quint, W., Soter, A., Walz, J., Yamazaki, Y., & Smorra, C. (2025). 

    Coherent spectroscopy with a single antiproton spin [Preprint]. Research Square. https://www.researchsquare.com/article/rs-123456/v1

     

  4. von Boehn, M., Schaper, J., Coenders, J. A., Brombacher, J., Meiners, T., Niemann, M., Cornejo, J. M., Ulmer, S., & Ospelkaus, C. (2025). 

    Speeding up adiabatic ion transport in macroscopic multi-Penning-trap stacks for high-precision experiments. 

    Communications Physics, 8(1), 107. https://doi.org/10.1038/s42005-025-01431-7

     

  5. Kraxberger, V., Bumbar, M., Gligorova, A., Amsler, C., Bayo, M., Breuker, H., Cerwenka, M., Costantini, G., Ferragut, R., Giammarchi, M., Gosta, G., Higaki, H., Hunter, E. D., Killian, C., Kuroda, N., Leali, M., Maero, G., Malbrunot, C., Mascagna, V., Matsuda, Y., Migliorati, S., Murtagh, D., Nanda, A., Nowak, L., Romé, M., Simon, M. C., Tajima, M., Toso, V., Ulmer, S., Venturelli, L., Weiser, A., Widmann, E., & Yamazaki, Y. (2025). 

    Towards a study of low energy antiproton annihilations on nuclei [Preprint]. arXiv. https://arxiv.org/abs/2503.04868

 

2024

  1. Smorra, C., Leonhardt, M., Schweitzer, D., Abbass, F., Anjum, K., Arndt, B., Erlewein, S., Endo, S., Geissler, P., Imamura, T., Jäger, J., Latacz, B., Micke, P., Völksen, F., Yildiz, H., Blaum, K., Devlin, J., Matsuda, Y., Ospelkaus, C., Quint, W., Soter, A., Walz, J., Yamazaki, Y., & Ulmer, S. (2024, December 18), 

    Proton Transport from the Antimatter Factory of CERN.  Research Square. https://doi.org/10.21203/rs.3.rs-5627457/v1

     

  2. Amsler, C., Breuker, H., Bumbar, M., Cerwenka, M., Costantini, G., Ferragut, R., Fleck, M., Giammarchi, M., Gligorova, A., Gosta, G., Hunter, E. D., Killian, C., Kolbinger, B., Kraxberger, V., Kuroda, N., Lackner, M., Leali, M., Maero, G., Mascagna, V., Matsuda, Y., Migliorati, S., Murtagh, D. J., Nanda, A., Nowak, L., Rheinfrank, S., Romé, M., Simon, M. C., Tajima, M., Toso, V., Ulmer, S., van Beuzekom, M., Venturelli, L., Weiser, A., Widmann, E., & Yamazaki, Y. (2024). 

    Antiproton annihilation at rest in thin solid targets and comparison with Monte Carlo simulations. 

    The European Physical Journal A, 60(11), 225. https://doi.org/10.1140/epja/s10050-024-00001-2

     

  3. Cornejo, J. M., Brombacher, J., Coenders, J. A., von Boehn, M., Meiners, T., Niemann, M., Ulmer, S., & Ospelkaus, C. (2024).

    Resolved-sideband cooling of a single Be⁺⁹ ion in a cryogenic multi-Penning-trap for discrete symmetry tests with (anti-)protons. 

    Physical Review Research, 6(3), 033233. https://doi.org/10.1103/PhysRevResearch.6.033233

     

  4. Dickopf, S., Sikora, B., Kaiser, A., Müller, M., Ulmer, S., Yerokhin, V. A., Harman, Z., Keitel, C. H., Mooser, A., & Blaum, K. (2024).

    Precision spectroscopy on 9Be overcomes limitations from nuclear structure. 

    Nature, 632(8026), 757–761. https://doi.org/10.1038/s41586-024-00614-0

     

  5. Latacz, B. M., Fleck, M., Jäger, J. I., Umbrazunas, G., Arndt, B. P., Erlewein, S. R., Wursten, E. J., Devlin, J. A., Micke, P., Abbass, F., Schweitzer, D., Wiesinger, M., Will, C., Yildiz, H., Blaum, K., Matsuda, Y., Mooser, A., Ospelkaus, C., Smorra, C., Soter, A., Quint, W., Walz, J., Yamazaki, Y., & Ulmer, S. (2024). 

    Orders of magnitude improved cyclotron-mode cooling for nondestructive spin quantum transition spectroscopy with single trapped antiprotons. 

    Physical Review Letters, 133(5), 053201. https://doi.org/10.1103/PhysRevLett.133.053201

     

  6. Amsler, C., Breuker, H., Bumbar, M., Chesnevskaya, S., Costantini, G., Ferragut, R., Giammarchi, M., Gligorova, A., Gosta, G., Higaki, H., Hori, M., Hunter, E. D., Killian, C., Kraxberger, V., Kuroda, N., Lanz, A., Leali, M., Maero, G., Malbrunot, C., Mäckel, V., Migliorati, S., Murtagh, D. J., Nagata, Y., Nanda, A., Nowak, L., Romé, M., Simon, M. C., Tajima, M., Toso, V., Ulmer, S., Venturelli, L., Weiser, A., Widmann, E., & Yamazaki, Y. (2024). 

    Injection and capture of antiprotons in a Penning–Malmberg trap using a drift tube accelerator and degrader foil. 

    Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1065, 169529. https://doi.org/10.1016/j.nima.2024.169529

     

  7. Will, C., Wiesinger, M., Micke, P., Yildiz, H., Driscoll, T., Kommu, S., Abbass, F., Arndt, B. P., Bauer, B. B., Erlewein, S., Fleck, M., Jäger, J. I., Latacz, B. M., Mooser, A., Schweitzer, D., Umbrazunas, G., Wursten, E., Blaum, K., Devlin, J. A., Ospelkaus, C., Quint, W., Soter, A., Walz, J., Smorra, C., & Ulmer, S. (2024). 

    Image-current mediated sympathetic laser cooling of a single proton in a Penning trap down to 170 mK axial temperature. 

    Physical Review Letters, 133(2), 023002. https://doi.org/10.1103/PhysRevLett.133.023002

     

  8. Kaiser, A., Dickopf, S., Door, M., Behr, R., Beutel, U., Eliseev, S., Kaushik, A., Kromer, K., Müller, M., Ulmer, S., Mooser, A., & Blaum, K. (2024). 

    Josephson voltage standards as ultra-stable low-noise voltage sources for precision Penning-trap experiments. 

    Applied Physics Letters, 124(22), 222601. https://doi.org/10.1063/5.0093020

     

  9. Meiners, T., Coenders, J. A., Brombacher, J., Niemann, M., Cornejo, J. M., Ulmer, S., & Ospelkaus, C. (2024). 

    Fast adiabatic transport of single laser-cooled 9Be⁺ ions in a cryogenic Penning trap stack. 

    The European Physical Journal Plus, 139(3), 262. https://doi.org/10.1140/epjp/s13360-024-00142-5

 

2023

  1. Antel, C., Battaglieri, M., Beacham, J., Boehm, C., Buchmüller, O., Calore, F., ... (2023).

    Feebly-interacting particles: FIPs 2022 workshop report. 

    The European Physical Journal C, 83(12), 1122. https://doi.org/10.1140/epjc/s10052-023-11765-5

     

  2. Wiesinger, M., Stuhlmann, F., Bohman, M., Micke, P., Will, C., Yildiz, H., Abbass, F., ... (2023). 

    Trap-integrated fluorescence detection with silicon photomultipliers for sympathetic laser cooling in a cryogenic Penning trap. 

    Review of Scientific Instruments, 94(12), 123108. https://doi.org/10.1063/5.0148820

     

  3. Murtagh, D. J., Amsler, C., Breuker, H., Bumbar, M., Chesnevskaya, S., ... (2023). 

    Slow positron production and storage for the ASACUSA-Cusp experiment. 

    Journal of Plasma Physics, 89(6), 905890608. https://doi.org/10.1017/S0022377823000179

     

  4. Borchert, M. J., Devlin, J. A., Erlewein, S. E., Fleck, M., Harrington, J. A., Higuchi, T., ... (2023). 

    A 16 parts per trillion comparison of the antiproton-to-proton q/m ratios. 

    arXiv preprint arXiv:2311.16006. https://arxiv.org/abs/2311.16006

     

  5. Smorra, C., Abbass, F., Schweitzer, D., Bohman, M., Devine, J. D., Dutheil, Y., ... (2023). 

    BASE-STEP: A transportable antiproton reservoir for fundamental interaction studies. 

    Review of Scientific Instruments, 94(11), 113101. https://doi.org/10.1063/5.0146335

     

  6. Latacz, B. M., Arndt, B. P., Devlin, J. A., Erlewein, S. R., Fleck, M., Jäger, J. I., Micke, P., ... (2023). 

    Ultra-thin polymer foil cryogenic window for antiproton deceleration and storage. 

    Review of Scientific Instruments, 94(10), 103101. https://doi.org/10.1063/5.0143582

     

  7. Hunter, E. D., Amsler, C., Breuker, H., Bumbar, M., Chesnevskaya, S., ... (2023). 

    SDR, EVC, and SDREVC: Limitations and extensions. 

    Journal of Plasma Physics, 89(5), 955890501. https://doi.org/10.1017/S0022377823000054

     

  8. Cornejo, J. M., Brombacher, J., Coenders, J. A., von Boehn, M., Meiners, T., ... (2023). 

    Optical stimulated-Raman sideband spectroscopy of a single ion in a Penning trap. 

    Physical Review Research, 5(3), 033226. https://doi.org/10.1103/PhysRevResearch.5.033226

     

  9. Pachucki, K., Udem, T., Ubachs, W., Crivelli, P., & Ulmer, S. (2023). 

    Topical issue: Precision physics of simple atomic systems. 

    The European Physical Journal D, 77(6), 117. https://doi.org/10.1140/epjd/s10053-023-00498-1

     

  10. Latacz, B. M., Arndt, B. P., Bauer, B. B., Devlin, J. A., Erlewein, S. R., Fleck, M., Jäger, J. I., ... (2023). 

    BASE—High-precision comparisons of the fundamental properties of protons and antiprotons. 

    The European Physical Journal D, 77(6), 94. https://doi.org/10.1140/epjd/s10053-023-00491-6

     

  11. Cornejo, J. M., Coenders, J. A., Niemann, M., Meiners, T., Mielke, J., ... (2023). 

    Towards resolved sideband laser cooling of single Be⁹⁺ ions in a Penning trap for precision experiments with (anti-)protons. 

    CPT and Lorentz Symmetry, 124-127.

     

  12. Kraxberger, V., Amsler, C., Breuker, H., Chesnevskaya, S., Costantini, G., ... (2023). 

    Upgrade of ASACUSA’s antihydrogen detector. Nuclear Instruments and Methods in 

    Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1065, 167529. https://doi.org/10.1016/j.nima.2023.167529

     

2022

  1. Voelksen, F., Borchert, M. J., Devlin, J. A., Erlewein, S., Fleck, M., Harrington, J. A., Latacz, B., Wursten, E., Mooser, A. H., Bohman, M. A., Grunhofer, V., Smorra, C., Wiesinger, M., Will, C., Blaum, K., Matsuda, Y., Ospelkaus, C., Quint, W., Walz, J., Yamazaki, Y., & Ulmer, S. (2022). 

    A high-Q superconducting toroidal medium frequency detection system with a capacitively adjustable frequency range >180 kHz. 

    Review of Scientific Instruments, 93, 093303. https://doi.org/10.1063/5.0086596

     

  2. Schneider, A., Sikora, B., Dickopf, S., Müller, M., Oreshkina, N. S., Rischka, A., Valuev, I. A., Ulmer, S., Walz, J., Harman, Z., Keitel, C. H., Mooser, A., & Blaum, K. (2022). 

    Direct measurement of the ³He magnetic moments. 

    Nature, 606, 878. https://doi.org/10.1038/s41586-022-04669-w

     

  3. Budker, D., Graham, P. W., Ramani, H., Schmidt-Kaler, F., Smorra, C., & Ulmer, S. (2022). 

    Millicharged dark matter detection with ion traps. 

    PRX Quantum, 3, 010330. https://doi.org/10.1103/PRXQuantum.3.010330

     

  4. Borchert, M. J., Devlin, J. A., Erlewein, S., Fleck, M., Harrington, J. A., Latacz, B., Wursten, E., Mooser, A. H., Bohman, M. A., Grunhofer, V., Smorra, C., Wiesinger, M., Will, C., Blaum, K., Matsuda, Y., Ospelkaus, C., Quint, W., Walz, J., Yamazaki, Y., & Ulmer, S. (2022). 

    A 16 parts-per-trillion measurement of the antiproton-to-proton charge-mass ratio. 

    Nature, 601, 53. https://doi.org/10.1038/s41586-021-04183-2

     

2021

  1. Bohman, M. A., Grunhofer, V., Smorra, C., Wiesinger, M., Will, C., Borchert, M. J., Devlin, J. A., Erlewein, S., Fleck, M., Harrington, J. A., Latacz, B., Wursten, E., Mooser, A. H., Blaum, K., Matsuda, Y., Ospelkaus, C., Quint, W., Walz, J., Yamazaki, Y., & Ulmer, S. (2021). 

    LC circuit mediated sympathetic cooling of a proton via image currents. 

    Nature, 596, 514. https://doi.org/10.1038/s41586-020-03188-x

     

  2. Devlin, J. A., Borchert, M. J., Erlewein, S., Fleck, M., Harrington, J. A., Latacz, B., Warncke, J., Wursten, E., Bohman, M. A., Mooser, A. H., Smorra, C., Wiesinger, M., Will, C., Blaum, K., Matsuda, Y., Ospelkaus, C., Quint, W., Walz, J., Yamazaki, Y., & Ulmer, S. (2021). 

    Constraints on the coupling between axion-like dark matter and photons using an antiproton superconducting tuned detection circuit in a cryogenic Penning trap. 

    Physical Review Letters, 126(4), 041301. https://doi.org/10.1103/PhysRevLett.126.041301

     

2020

  1. Schüssler, R. X., Bekker, H., Braß, M., Cakir, H., Crespo López-Urrutia, J. R., Door, M., Filianin, P., Harman, Z., Haverkort, M. W., Huang, W. J., Indelicato, P., Keitel, C. H., König, C. M., Kromer, K., Müller, M., Novikov, Y. N., Rischka, A., Schweiger, C., Sturm, S., Ulmer, S., Eliseev, S., & Blaum, K. (2020). 

    Detection of metastable electronic states by Penning trap mass spectrometry. 

    Nature, 581, 64. https://doi.org/10.1038/s41586-020-2149-9

     

2019

  1. Smorra, C., Stadnik, Y., Bohman, M., Borchert, M. J., Erlewein, S., Harrington, J. A., Devlin, J. A., Blessing, P. E., Higuchi, T., Wiesinger, M., Schneider, G., Mooser, A., Blaum, K., Matsuda, Y., Quint, W., Walz, J., Budker, D., & Ulmer, S. (2019). 

    Direct limits on the interaction of antiprotons with axion-like dark matter. 

    Nature, 575, 310. https://doi.org/10.1038/s41586-019-1710-4

  2. Borchert, M. J., Blessing, P. E., Devlin, J. A., Harrington, J. A., Higuchi, T., Morgner, J., Wursten, E., Bohman, M., Wiesinger, M., Smorra, C., Blaum, K., Matsuda, Y., Quint, W., Walz, J., & Ulmer, S. (2019). 

    Measurement of ultra-low heating rates in a cryogenic Penning trap. 

    Physical Review Letters, 122(4), 043201. https://doi.org/10.1103/PhysRevLett.122.043201

  3. Schneider, A., Mooser, A., Rischka, A., Blaum, K., Ulmer, S., & Walz, J. (2019). 

    A novel Penning trap design for the high precision measurement of the ³He²⁺ nuclear magnetic moment. 

    Annalen der Physik (Berlin), 531(8), 1800485. https://doi.org/10.1002/andp.201800485

  4. Devlin, J. A., Wursten, E., Harrington, J. A., Borchert, M. J., Blessing, P. E., Higuchi, T., Morgner, J., Bohman, M., Wiesinger, M., Smorra, C., Blaum, K., Matsuda, Y., Quint, W., Walz, J., & Ulmer, S. (2019). 

    Superconducting solenoid system with adjustable shielding factor for precision measurements of the properties of the antiprotons. 

    Physical Review Applied, 12(4), 044012. https://doi.org/10.1103/PhysRevApplied.12.044012

2018

  1. Ulmer, S., Mooser, A., Nagahama, H., Sellner, S., & Smorra, C. (2017). 

    Challenging the Standard Model by high precision comparisons of the fundamental properties of protons and antiprotons. 

    Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 376(2123), 20170275. https://doi.org/10.1098/rsta.2017.0275

2017

  1. Bohman, M., Schneider, G., Mooser, A., Schön, N., Harrington, J., Higuchi, T., Nagahama, H., Sellner, S., Smorra, C., Blaum, K., Matsuda, Y., Quint, W., Walz, J., & Ulmer, S. (2017). 

    Sympathetic cooling of protons and antiprotons with a common endcap Penning trap. 

    Journal of Modern Optics. https://doi.org/10.1080/09500340.2017.1404656

  2. Schneider, G., Mooser, A., Bohman, M., Schön, N., Harrington, J., Higuchi, T., Nagahama, H., Sellner, S., Smorra, C., Blaum, K., Matsuda, Y., Quint, W., Walz, J., & Ulmer, S. (2017). 

    Double-trap measurement of the proton magnetic moment at 0.3 parts per billion precision. 

    Science, 358(6363), 1081. https://doi.org/10.1126/science.aaf9189

  3. Smorra, C., Sellner, S., Borchert, M. J., Harrington, J. A., Higuchi, T., Nagahama, H., Tanaka, T., Mooser, A., Schneider, G., Bohman, M., Blaum, K., Matsuda, Y., Ospelkaus, C., Quint, W., Walz, J., Yamazaki, Y., & Ulmer, S. (2017). 

    A parts-per-billion measurement of the antiproton magnetic moment. 

    Nature, 550(7676), 371-374. https://doi.org/10.1038/nature24061

  4. Sellner, S., Besirli, M., Bohman, M., Borchert, M. J., Harrington, J., Higuchi, T., Mooser, A., Nagahama, H., Schneider, G., Smorra, C., Tanaka, T., Blaum, K., Matsuda, Y., Ospelkaus, C., Quint, W., Walz, J., Yamazaki, Y., & Ulmer, S. (2017). 

    Improved limit on the directly measured antiproton lifetime. 

    New Journal of Physics, 19(8), 083023. https://doi.org/10.1088/1367-2630/aa81d3

  5. Smorra, C., Mooser, A., Besirli, M., Bohman, M., Borchert, M. J., Harrington, J., Higuchi, T., Nagahama, H., Tanaka, T., Sellner, S., Schneider, G., Blaum, K., Matsuda, Y., Ospelkaus, C., Quint, W., Walz, J., Yamazaki, Y., & Ulmer, S. (2017). 

    Observation of individual spin quantum transitions of a single antiproton. 

    Physics Letters B, 769, 1-6. https://doi.org/10.1016/j.physletb.2017.03.050

     

  6. Nagahama, H., Smorra, C., Sellner, S., Harrington, J., Higuchi, T., Borchert, M. J., Tanaka, T., Besirli, M., Mooser, A., Schneider, G., Blaum, K., Matsuda, Y., Ospelkaus, C., Quint, W., Walz, J., Yamazaki, Y., & Ulmer, S. (2017). 

    Sixfold improved single particle measurement of the magnetic moment of the antiproton. 

    Nature Communications, 8, 14084. https://doi.org/10.1038/ncomms14084

2016

  1. Nagahama, H., Schneider, G., Mooser, A., Besirli, M., Borchert, M. J., Blaum, K., Harrington, J., Higuchi, T., Matsuda, Y., Ospelkaus, C., Quint, W., Sellner, S., Smorra, C., Tanaka, T., Walz, J., Yamazaki, Y., & Ulmer, S. (2016). 

    Highly sensitive superconducting circuits at 700 kHz with tunable quality factors for image-current detection of single trapped antiprotons. 

    Review of Scientific Instruments, 87(11), 113305. https://doi.org/10.1063/1.4965447

2015

  1. Ulmer, S., Smorra, C., Mooser, A., Franke, K., Nagahama, H., Schneider, G., Higuchi, T., Van Gorp, S., Blaum, K., Matsuda, Y., Quint, W., Walz, J., & Yamazaki, Y. (2015). 

    High-precision comparison of the antiproton-to-proton charge-to-mass ratio. 

    Nature, 524(7564), 196. https://doi.org/10.1038/nature14651

     

  2. BASE - The Baryon Antibaryon Symmetry Experiment
    C. Smorra, K. Blaum, L. Bojtar, M. Borchert, K. A. Franke, T. Higuchi, N. Leefer, H. Nagahama, Y. Matsuda, A. Mooser, M. Niemann, C. Ospelkaus, W. Quint, G. Schneider, S. Sellner, T. Tanaka, S. Van Gorp, J. Walz, Y. Yamazaki, S. Ulmer
    Eur. Phys. J. Special Topics 224, 3055 (2015)

     

  3. Smorra, C., Mooser, A., Franke, K., Nagahama, H., Schneider, G., Higuchi, T., Gorp, S. V., Blaum, K., Matsuda, Y., Quint, W., Walz, J., Yamazaki, Y., & Ulmer, S. (2015). 

    A reservoir trap for antiprotons. International Journal of Mass Spectrometry, 389, 10. https://doi.org/10.1016/j.ijms.2015.05.001

  4. Nagata, Y., et al. (2015). 

    The development of the antihydrogen beam detector and the detection of the antihydrogen atoms for in-flight hyperfine spectroscopy. 

    Journal of Physics: Conference Series, 635, 022061. https://doi.org/10.1088/1742-6596/635/2/022061

  5. Ulmer, S., Quint, W., & Blaum, K. (2015). 

    Precise tests of fundamental symmetries with exotic particles in Penning traps. World Scientific Books, Lecture Notes.

2014

  1. Smorra, C., Blaum, K., Franke, K., Matsuda, Y., Mooser, A., Nagahama, H., Ospelkaus, C., Quint, W., Schneider, G., Van Gorp, S., Walz, J., Yamazaki, Y., & Ulmer, S. (2014). 

    Towards a high-precision measurement of the antiproton magnetic moment. Hyperfine Interactions, 

    Nature, 228(1–3), 31–36. https://doi.org/10.1007/s10751-014-1018-7

     

  2. Mooser, A., Ulmer, S., Blaum, K., Franke, K., Kracke, H., Leiteritz, C., Quint, W., Rodegheri, C. C., Smorra, C., & Walz, J. (2014). 

    Direct high-precision measurement of the magnetic moment of the proton. 

    Nature, 509(7502), 596–599. https://doi.org/10.1038/nature13388

  3. Ulmer, S., Mooser, A., Blaum, K., Braeuninger, S., Franke, K., Kracke, H., Leiteritz, C., Matsuda, Y., Nagahama, H., Ospelkaus, C., Rodegheri, C. C., Quint, W., Schneider, G., Smorra, C., Van Gorp, S., Walz, J., & Yamazaki, Y. (2014). 

    The magnetic moments of the proton and the antiproton. 

    Journal of Physics: Conference Series, 488, 012033. https://doi.org/10.1088/1742-6596/488/1/012033

  4. Ulmer, S., & Smorra, C. (2014). 

    The magnetic moments of the proton and the antiproton. In W. Quint & M. Vogel (Eds.), 

    Precision Spectroscopy in Ion Traps for Fundamental Physics (pp. 165–201). Springer. https://doi.org/10.1007/978-3-642-45201-7_6

2013

  1. Mooser, A., Bräuninger, S., Franke, K., Kracke, H., Leiteritz, C., Rodegheri, C. C., Nagahama, H., Schneider, G., Smorra, C., Blaum, K., Matsuda, Y., Quint, W., Walz, J., Yamazaki, Y., & Ulmer, S. (2013). 

    Demonstration of the double Penning trap technique with a single proton. 

    Physics Letters B, 723(1–3), 78–81. https://doi.org/10.1016/j.physletb.2013.05.012

     

  2. Mooser, A., Kracke, H., Blaum, K., Bräuninger, S. A., Franke, K., Leiteritz, C., Quint, W., Rodegheri, C. C., Ulmer, S., & Walz, J. (2013). 

    Resolution of single spin flips of a single proton. 

    Physical Review Letters, 110(14), 140405. https://doi.org/10.1103/PhysRevLett.110.140405

     

  3. Ulmer, S., Blaum, K., Kracke, H., Mooser, A., Quint, W., Rodegheri, C. C., & Walz, J. (2013). 

    A cryogenic detection system at 28.9 MHz for the non-destructive observation of a single proton at low particle energy. 

    Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 705, 55–60. https://doi.org/10.1016/j.nima.2012.12.071

     

  4. Yamazaki, Y., & Ulmer, S. (2013). 

    CPT symmetry tests with cold p¯ and antihydrogen. 

    Annalen der Physik, 525(7), 493–504. https://doi.org/10.1002/andp.201300060

     

  5. Mooser, A., Kracke, H., Blaum, K., Bräuninger, S. A., Franke, K., Leiteritz, C., Quint, W., Rodegheri, C. C., Ulmer, S., & Walz, J. (2013). 

    Resolution of single spin flips of a single proton. 

    Physical Review Letters, 110(14), 140405. https://doi.org/10.1103/PhysRevLett.110.140405

     

  6. Widmann, E., Diermaier, M., Juhász, B., Malbrunot, C., Massiczek, O., Sauerzopf, C., Suzuki, K., Wünschek, B., Zmeskal, J., Federmann, S., Kuroda, N., Ulmer, S., & Yamazaki, Y. (2013). 

    Measurement of the hyperfine structure of antihydrogen in a beam. Hyperfine Interactions, 

    Nature, 215(1), 1–6. https://doi.org/10.1007/s10751-013-0809-6

     

2012

  1. Rodegheri, C. C., Blaum, K., Kracke, H., Kreim, S., Mooser, A., Quint, W., Ulmer, S., & Walz, J. (2012). 

    An experiment for the direct determination of the g-factor of a single proton in a Penning trap. 

    New Journal of Physics, 14(6), 063011. https://doi.org/10.1088/1367-2630/14/6/063011

     

2011

  1. Ulmer, S., Blaum, K., Kracke, H., Mooser, A., Quint, W., Rodegheri, C. C., & Walz, J. (2011). 

    Direct measurement of the free cyclotron frequency of a single particle in a Penning trap. 

    Physical Review Letters, 107(10), 103002. https://doi.org/10.1103/PhysRevLett.107.103002

     

  2. Ulmer, S., Rodegheri, C. C., Blaum, K., Kracke, H., Mooser, A., Quint, W., & Walz, J. (2011). 

    Observation of spin flips with a single trapped proton. 

    Physical Review Letters, 106(25), 253001. https://doi.org/10.1103/PhysRevLett.106.253001

     

  3. Mooser, A., Blaum, K., Kracke, H., Kreim, S., Quint, W., Rodegheri, C. C., Ulmer, S., & Walz, J. (2011). 

    Towards a direct measurement of the g-factor of a single isolated proton. 

    Canadian Journal of Physics, 89(2), 165–168. https://doi.org/10.1139/p11-016

     

2009

  1. Ulmer, S., Kracke, H., Blaum, K., Kreim, S., Mooser, A., Quint, W., Rodegheri, C. C., & Walz, J. (2009). 

    The quality factor of a superconducting rf resonator in a magnetic field. 

    Review of Scientific Instruments, 80(12), 123302. https://doi.org/10.1063/1.3271537

     

  2. Rodegheri, C. C., Blaum, K., Kracke, H., Kreim, S., Mooser, A., Mrozik, C., Quint, W., Ulmer, S., & Walz, J. (2009). 

    Developments for the direct determination of the g-factor of a single proton in a Penning trap. Hyperfine Interactions, 

    Nature, 194(1–3), 93–98. https://doi.org/10.1007/s10751-009-0035-4

     

  3. Ketelaer, J., Blaum, K., Block, M., Eberhardt, K., Eibach, M., Ferrer, R., George, S., Herfurth, F., Ketter, J., Nagy, S., Repp, J., Schweikhard, L., Smorra, C., Sturm, S., & Ulmer, S. (2009). 

    Recent developments in ion detection techniques for Penning trap mass spectrometry at TRIGA-TRAP. 

    The European Physical Journal A, 42(3), 311–317. https://doi.org/10.1140/epja/i2008-10711-6

     

2008

  1. Verdú, J., Kreim, S., Blaum, K., Kracke, H., Quint, W., Ulmer, S., & Walz, J. (2008). 

    Calculation of electrostatic fields using quasi-Green's functions: Application to the hybrid Penning trap. 

    New Journal of Physics, 10, 103009. https://doi.org/10.1088/1367-2630/10/10/103009#

     

2005

  1. Verdú, J., Kreim, S., Djekic, S., Blaum, K., Kracke, H., Quint, W., Stahl, S., Ulmer, S., Vogel, M., Walz, J., & Werth, G. (2005). 

    Penning trap measurement of the magnetic moment of the antiproton. 

    AIP Conference Proceedings, 796, 260–265. https://doi.org/10.1063/1.2130176