Publications

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
Sixfold improved single particle measurement of the magnetic moment of the antiproton
Rev. Sci. Instrum. 8 14084 (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. Walz
An 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)