Publications
2022
A. Schneider, B.Sikora, S Dickopf, M.mueller, N.S. Oreshkins, A. Rischka, I.A. Valuev, S. Ulmer, J. Walz, Z. Harman, C. H. Keitel, A. Mooser and K. Blaum
Direct measurement of the 3He+ magnetic moments
nature606, 878-883(2022)
Dmitry Budker, Peter W. Graham , Harikrishnan Ramani , Ferdinand Schmidt-Kaler , Christian Smorra, and Stefan Ulmer
Millicharged Dark Matter Detection with Ion TrapsHere is again the link to the reference:
M.J. Borchert, J.A. Devlin, S.R. Erlewein, M.Fleck, J.A. Harrington, T.Higuchi, B.M. Latacz, F. Voelksen, E.J. Wursten, F. Abbass, M.A. Bohman, A.H. Mooser, D. popper, M. Wiesinger, C. Will, K. Blaum, Y. Matsuda, C. Ospelkaus, W. Quint, J. Walz, Y. Yamazaki, C. Smorra, and S. Ulmer
A 16-parts-per-trillion measurement of the antiproton-to-proton charge–mass ratio
Nature 601, 53-57(2022)
2021
M. Bohman, V. Grunhofer, C. Smorra, M. Wiesinger, C. will, M.J. Borchert, J.A. Devlin, S. Erlewein, M. Fleck, S. Gavranovic, J. Harrington, B. Latacz, A. Mooser, D. Popper, E. Wursten, K. Blaum, Y Matsuda, C. Ospekaus, W. Quint, J. Walz, S. Ulmer, and BASE Collaboration
Sympathetic cooling of a trapped proton mediated by an LC circuit
Nature 596 514-518(2021)
P. Filianin, C. Lyu, M. Door, K. Blaum, W. J. Huang, M. Haverkort, P. Indelicato, C. H. Keitel, K. Kromer, D. Lange, Y. N. Novikov, A. Rischka, R. X. Schüssler, Ch. Schweiger, S. Sturm, S. Ulmer, Z. Harman, and S. Eliseev
Direct Q-Value Determination of the β−Decay of 187 Re
Phys. Rev. Lett. 127, 072502 (2021)
Jack A. Devlin, Matthias J. Borchert, Stefan Erlewein, Markus Fleck, James A. Harrington, Barbara Latacz, Jan Warncke, Elise Wursten, Matthew A. Bohman, Andreas H. Mooser, Christian Smorra, Markus Wiesinger, Christian Will, Klaus Blaum, Yasuyuki Matsuda, Christian Ospelkaus, Wolfgang Quint, Jochen Walz, Yasunori Yamazaki, and Stefan Ulmer
Constraints on the Coupling between Axionlike Dark Matter and Photons Using an Antiproton Superconducting Tuned Detection Circuit in a Cryogenic Penning Trap
Phys. Rev. Lett. 126, 041301 (2021)
2020
R. X. Schüssler, H. Bekker, M. Braß, H. Cakir, J. R. Crespo López-Urrutia, M. Door, P. Filianin, Z. Harman, M. W. Haverkort, W. J. Huang, P. Indelicato, C. H. Keitel, C. M. König, K. Kromer, M. Müller, Y. N. Novikov, A. Rischka, C. Schweiger, S. Sturm, S. Ulmer, S. Eliseev, K. Blaum
Detection of Metastable Electronic States by Penning Trap Mass Spectrometry
Nature 581, 42-46 (2020)
2019
S. Smorra, Y.V. Stadnik, P.E. Blessing, M. Bohman, M.J. Borchert, J.A. Devlin, S. Erlewein, J.A. Harrington, T. Higuchi, A. Mooser, G. Schneider, M. Wieslinger, E. Wursten, K. Blaum, Y. Matsuda, C. Ospelkaus, W. Quint, J. Walz, Y. Yamazaki, D. Budker and S. Ulmer
Direct limits on the interaction of antiprotons with axion-like dark matter
Nature 575, 310-314 (2019)
Jack A. Devlin, Elise Wursten, James A. Harrington, Takashi Higuchi, Pascal E. Blessing, Matthias J. Borchert, Stefan Erlewein, Jannek J. Hansen, Jonathan Morgner, Matthew A. Bohman, Andreas H. Mooser, Christian Smorra, Markus Wiesinger, Klaus Blaum, Yasuyuki Matsuda, Christian Ospelkaus, Wolfgang Quint, Jochen Walz, Yasunori Yamazaki, and Stefan Ulmer
Superconducting Solenoid System with Adjustable Shielding Factor for Precision Measurements of the Properties of the Antiproton
Phys. Rev. Applied 12, 044012 (2019)
M. J. Borchert, P. E. Blessing, J. A. Devlin, J. A. Harrington, T. Higuchi, J. Morgner, C. Smorra, E. Wursten, M. Bohman, M. Wiesinger, A. Mooser, K. Blaum, Y. Matsuda, C. Ospelkaus, W. Quint, J. Walz, Y. Yamazaki, and S. Ulmer
Measurement of Ultra-Low Heating Rates of a Single Antiproton in a Cryogenic Penning Trap
Phys. Rev. Lett. 122, 043201
2018
S. Ulmer, A. Mooser, H. Nagahama, S. Sellner, C. Smorra
Challenging the standard model by high-precision comparisons of the fundamental properties of protons and antiprotons
Philosophical Transactions of The Royal Society A, Theo Murphy meeting issue Vol. 376, issue 2116
2017
G. Schneider, A. Mooser, M. Bohman, N. Schön, J. Harrington, T. Higuchi, H. Nagahama, S. Sellner, C. Smorra, K. Blaum, Y. Matsuda, W. Quint, J. Walz, S. Ulmer
Double-trap measurement of the proton magnetic moment at 0.3 parts per billion precision
Science Vol. 358, Issue 6366, pp. 1081-1084
C. Smorra, S. Sellner, M. J. Borchert, J. A. Harrington, T. Higuchi, H. Nagahama, T. Tanaka, A. Mooser, G. Schneider, M. Bohman, K. Blaum, Y. Matsuda, C. Ospelkaus, W. Quint, J. Walz, Y. Yamazaki and S. Ulmer
A parts-per-billion measurement of the antiproton magnetic moment
Nature 550, 371-374 (2017)
S. Sellner, M. Besirli, M. Bohman, M.J. Borchert, J. Harrington, T. Higuchi, A. Mooser, H. Nagahama, G. Schneider, C. Smorra, T. Tanaka, K. Blaum, Y. Matsuda, C. Ospelkaus, W. Quint, J. Walz, Y. Yamazaki and S. Ulmer
Improved limit on the directly measured antiproton lifetime
New J. Phys. 19 083023 (2017)
F. Heiße, F. Köhler-Langes, S. Rau, J. Hou, S. Junck, A. Kracke, A. Mooser, W. Quint, S. Ulmer, G. Werth, K. Blaum, and S. Sturm
High-Precision Measurement of the Proton’s Atomic Mass
Phys. Rev. Lett. 119, 033001 (2017)
C. Smorra, A. Mooser, M. Besirli, M. Bohman, M. J. Borchert, J. Harrington, T. Higuchi, H. Nagahama, T. Tanaka, S. Sellner, G. Schneider,
K. Blaum, Y. Matsuda, C. Ospelkaus, W. Quint, J. Walz, Y. Yamazaki, and S. Ulmer
Observation of individual spin quantum transitions of a single antiproton
Phys. Lett. B 769, 1 (2017)
S. Ulmer
Optical transition seen in antihydrogen
Nature 541, 467 (2017)
H. Nagahama, C. Smorra, S. Sellner, J. Harrington, T. Higuchi, M. J. Borchert, T. Tanaka, M. Besirli, A. Mooser, G. Schneider,
K. Blaum, Y. Matsuda, C. Ospelkaus, W. Quint, J. Walz, Y. Yamazaki, and S. Ulmer
Sixfold improved single particle measurement of the magnetic moment of the antiproton
Nat. Commun. 8 14084 (2017)
2016
H. Nagahama, G. Schneider, A. Mooser, M. Besirli, M. J. Borchert, K. Blaum, J. Harrington, T. Higuchi, Y. Matsuda, C. Ospelkaus, W. Quint, S. Sellner, C. Smorra, T. Tanaka, J. Walz, Y. Yamazaki, and S. Ulmer
Highly sensitive superconducting circuits at 700 kHz with tunable quality factors for image-current detection of single trapped antiprotons.
Rev. Sci. Instrum. 87 113305 (2016)
2015
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, and S. Ulmer
BASE - The Baryon Antibaryon Symmetry Experiment
Europ. Phys. Journ. Spec. Top. 389, 10 (2015)
C. Smorra, A. Mooser, K. Franke, H. Nagahama, G. Schneider, T. Higuchi, S.V. Gorp, K. Blaum, Y. Matsuda, W. Quint, J. Walz, Y. Yamazaki, S. Ulmer
A reservoir trap for antiprotons
Int. Journ. Mass Spec. 389, 10 (2015)
S. Ulmer, C. Smorra, A. Mooser, K. Franke, H. Nagahama, G. Schneider, T. Higuchi, S. Van Gorp, K. Blaum, Y. Matsuda, W. Quint, J. Walz, and Y. Yamazaki
High-precision comparison of the antiproton-to-proton charge-to-mass ratio
Nature 524, 196 (2015)
2014
C. Smorra, K. Blaum, K.A. Franke, T. Higuchi, H. Nagahama, Y. Matsuda, A. Mooser, W. Quint, G. Schneider, S. Van Gorp, J. Walz, Y. Yamazaki, and S. Ulmer
Towards a high-precision measurement of the antiproton magnetic moment
Hyperf. Interactions 228, 31 (2014)
A. Mooser, S. Ulmer, K. Blaum, S. A. Bräuninger, K. Franke, H. Kracke, C. Leiteritz, W. Quint, C. C. Rodegheri, C. Smorra and J. Walz
Direct high-precision measurement of the magnetic moment of the proton
Nature 509, 596 (2014)
N. Kuroda, S. Ulmer, D. J. Murtagh, S. Van Gorp, Y. Nagata, M. Diermaier, S. Federmann, M. Leali, C. Malbrunot, V. Mascagna, O. Massiczek, K. Michishio, T. Mizutani, A. Mohri, H. Nagahama, M. Ohtsuka, B. Radics, S. Sakurai, C. Sauerzopf, K. Suzuki, M. Tajima, H. A. Torii, L. Venturelli, B. Wu¨nschek, J. Zmeskal, N. Zurlo, H. Higaki, Y. Kanai, E. Lodi Rizzini, Y. Nagashima, Y. Matsuda, E. Widmann, and Y. Yamazaki
A source of antihydrogen for in-flight hyperfine spectroscopy
Nat. Commun. 5, 3089 (2014)
2013
A. Mooser, H. Kracke, K. Blaum, S. A. Bräuninger, K. Franke, C. Leiteritz, W. Quint, C. C. Rodegheri, S. Ulmer, and J. Walz
Demonstration of the Double Penning Trap Technique with a Single Proton
Phys. Lett. B. 723, 78 (2013)
Y. Yamazaki and S. Ulmer
CPT Symmetry Tests with cold Antiprotons and Antihydrogen
Ann. Phys. (2013) DOI: 10.1002/andp.201300060
A. Mooser, H. Kracke, K. Blaum, S. A. Bräuninger, K. Franke, C. Leiteritz, W. Quint, C. C. Rodegheri, S. Ulmer, and J. Walz
Resolution of Single Spin Flips of a Single Proton
Phys. Rev. Lett. 110, 140405 (2013)
S. Ulmer, K. Blaum, H. Kracke, A. Mooser, W. Quint, C. C. Rodegehri, and J. Walz
A cryogenic detection system at 28.9 MHZ for the non-destructive observation of a single proton at low particle energy
Nucl. Instrum. Meth. Phys. Res. A. 705, 55 (2013)
E. Widmann, M. Diermaier, B. Juhász, C. Malbrunot, O. Massiczek, C. Sauerzopf, K. Suzuki, B. Wünschek, J. Zmeskal, S. Federmann, N. Kuroda, S. Ulmer, Y. Yamazaki
Measurement of the hyperfine structure of antihydrogen in a beam
Hyperfine Interactions (2013), DOI: 10.1007/s10751-013-0809-6
S. Ulmer et al. (BASE Collaboration)
BASE - Technical Design Report
CERN Document Sever (2013)
2012
C. C. Rodegheri, K. Blaum. H. Kracke, S. Kreim, A. Mooser, W. Quint, S. Ulmer, J. WalzAn experiment for the direct determination of the g-factor of a single proton in a Penning trap
New J. Phys. 14 063011 doi:10.1088/1367-2630/14/6/063011
2011
J. Repp, C. Böhm, J. R. Crespo López-Urrutia, A. Dörr, S. Eliseev, S. George, M. Goncharov, Y. N. Novikov, C. Roux and S. Sturm, S. Ulmer and K. Blaum
PENTATRAP: a novel cryogenic multi-Penning-trap experiment for high-precision mass measurements on highly charged ions
Appl. Phys. B, DOI: 10.1007/s00340-011-4823-6 (2011)
C. Roux, C. Böhm, A. Dörr, S. Eliseev, S. George, M. Goncharov, Y. N. Novikov, J. Repp, S. Sturm and S. Ulmer, and K. Blaum
The trap design of PENTATRAP
Appl. Phys. B, DOI 10.1007/s00340-011-4825-4 (2011)
S. Ulmer, K. Blaum und J. Walz
Quantensprünge des Proton-Spins
Physik in unserer Zeit 42, 216 (2011)
S. Ulmer, K. Blaum, H. Kracke, A. Mooser, W. Quint, C. C. Rodegheri, and J. Walz
Direct Measurement of the Free Cyclotron Frequency of a Single Particle in a Penning Trap
Phys. Rev. Lett. 107, 103002 (2011)
S. Ulmer, C. C. Rodegheri, K. Blaum, H. Kracke, A. Mooser, W. Quint, and J. Walz
Observation of Spin Flips with a Single Trapped Proton
Phys. Rev. Lett. 106, 253001 (2011)
Andreas Mooser, Klaus Blaum, Holger Kracke, Susanne Kreim, Wolfgang Quint, Cricia Rodeghéri, Stefan Ulmer, and Jochen Walz
Towards a direct measurement of the g-factor of a single isolated proton
Can. J. Phys. 89, 165–168 (2011)
2009
J. Ketelaer, K. Blaum, M. Block, K. Eberhardt, M. Eibach, R. Ferrer, S. George, F. Herfurth, J. Ketter, Sz. Nagy, J. Repp, L. Schweikhard, C. Smorra, S. Sturm, and S. Ulmer
Recent developments in ion detection techniques for Penning trap mass spectrometry at Triga-Trap
Eur. Phys. J. A 42, 311–317 (2009)
S. Ulmer, H. Kracke, K. Blaum, S. Kreim, A. Mooser, W. Quint, C. C. Rodegheri, and J. Walz
The quality factor of a superconducting rf resonator in a magnetic field
Rev. Sci. Instrum. 80, 123302 (2009)
C. C. Rodegheri, K. Blaum, H. Kracke, S. Kreim, A. Mooser, C. Mrozik, W. Quint, S. Ulmer, and J. Walz
Developments for the direct determination of the g-factor of a single proton in a Penning trap
Hyp. Int. 194, 93-98 (2009)
K. Blaum, H. Kracke, S. Kreim, A. Mooser, C. Mrozik, W. Quint, C. C. Rodegheri, B. Schabinger, S. Sturm, S. Ulmer, A. Wagner, J. Walz, and G. Werth
g-factor experiments on simple systems in Penning traps
J. Phys. B: At. Mol. Opt. Phys. 42, 154021 (2009)
Earlier
J. Verdú, S. Kreim, K. Blaum, H. Kracke, W. Quint, S. Ulmer, and J. Walz
Calculation of electrostatic fields using quasi-Green's functions: application to the hybrid Penning trap
New J. Phys. 10, 103009-1 - 103009-23 (2008)
J. Verdú, K. Blaum, S. Djekic, S. Kreim, W. Quint, S. Stahl, S. Ulmer, M. Vogel, J. Walz, G. Werth
Penning trap measurement of the magnetic moment of the antiproton
AIP Conference Proceedings 796, 260-265 (2005)
Promoting Articles
R. Blatt
News and Views: Spinflips with a Single Proton
Nature 475, 298 (2011)
J. Stajic
Science Editor's Choice: The Universe in the mirror
Science 333, 386 (2011)
E. G. Myers
Viewpoint: Not your usual NMR
Physics 4, 49 (2011)
K. Jungmann
Flippig in der Falle
Physik Journal 10, 18 (2011)