Zobrazeno 1 - 10
of 14
pro vyhledávání: '"Johannes Ullmann"'
Autor:
Johannes Ullmann, Zoran Andelkovic, Carsten Brandau, Andreas Dax, Wolfgang Geithner, Christopher Geppert, Christian Gorges, Michael Hammen, Volker Hannen, Simon Kaufmann, Kristian König, Yuri A. Litvinov, Matthias Lochmann, Bernhard Maaß, Johann Meisner, Tobias Murböck, Rodolfo Sánchez, Matthias Schmidt, Stefan Schmidt, Markus Steck, Thomas Stöhlker, Richard C. Thompson, Christian Trageser, Jonas Vollbrecht, Christian Weinheimer, Wilfried Nörtershäuser
Publikováno v:
Nature Communications, Vol 8, Iss 1, Pp 1-7 (2017)
Precision measurements provide a sensitive test of fundamental constants and their uncertainties. Here the authors precisely measure the hyperfine structure splitting in bismuth ions, and report significant discrepancy with the theoretical prediction
Externí odkaz:
https://doaj.org/article/af36d1e2f6aa4742bd787a0a1e163217
Autor:
R. Sánchez, Th. Walther, J. Vollbrecht, M. Siebold, Johannes Ullmann, Lewin Eidam, Huping Wang, X. L. Ma, Daniel Kiefer, Michael Bussmann, Axel Buß, D. Winzen, Th. Kühl, C. Egelkamp, Volker Hannen, Sebastian Klammes, H.-W. Ortjohann, Th. Stöhlker, Danyal Winters, Ch. Weinheimer, Wilfried Nörtershäuser, Zhongliang Huang, Markus Loeser
Publikováno v:
Scientific Reports. 11
Autor:
Rodolfo Sánchez, Volker Hannen, M. Hammen, S. Kaufmann, Christopher Geppert, Matthias Schmidt, J. Meisner, Zoran Andelkovic, Yuri A. Litvinov, Stefan E. Schmidt, C. Gorges, Johannes Ullmann, Christian Weinheimer, C. Brandau, B. Maaß, W. Geithner, J. Vollbrecht, Richard C. Thompson, Kristian König, Matthias Lochmann, Markus Steck, T. Murböck, Wilfried Nörtershäuser, C. Trageser, Thomas Stöhlker, Andreas Dax
Publikováno v:
Nature Communications, Vol 8, Iss 1, Pp 1-7 (2017)
Nature Communications
Nature Communications
Electrons bound in highly charged heavy ions such as hydrogen-like bismuth 209Bi82+ experience electromagnetic fields that are a million times stronger than in light atoms. Measuring the wavelength of light emitted and absorbed by these ions is there
Autor:
Johannes Ullmann, Wilfried Nörtershäuser, J. Meisner, Kristian König, Stephan Passon, Bernhard MaaB, Christopher Geppert, Ernst Wilhelm Otten, Tim Ratajczyk, J. Krämer, Phillip Imgram
Publikováno v:
2018 Conference on Precision Electromagnetic Measurements (CPEM 2018).
We present results of laser spectroscopic high voltage measurements on the 5 ppm relative uncertainty level using a pump and probe scheme on Ca+ ions. With the two-stage laser interaction and with a reference measurement we can eliminate systematic e
Autor:
Leonid V, Skripnikov, Stefan, Schmidt, Johannes, Ullmann, Christopher, Geppert, Florian, Kraus, Benjamin, Kresse, Wilfried, Nörtershäuser, Alexei F, Privalov, Benjamin, Scheibe, Vladimir M, Shabaev, Michael, Vogel, Andrey V, Volotka
Publikováno v:
Physical review letters. 120(9)
A recent measurement of the hyperfine splitting in the ground state of Li-like ^{208}Bi^{80+} has established a "hyperfine puzzle"-the experimental result exhibits a 7σ deviation from the theoretical prediction [J. Ullmann et al., Nat. Commun. 8, 15
Autor:
Wilfried Nörtershäuser, Johannes Ullmann, A. Krieger, Christian Gorges, Elisa Will, S. Kaufmann, C. Geppert, M. Hammen, N. Frömmgen
Publikováno v:
Hyperfine Interactions. 227:157-168
An electronic measurement of high-voltages of several ten kV with accuracy as required for precision experiments is currently only feasible using highly sophisticated voltage dividers. Collinear laser spectroscopy can provide a direct and precise mea
Autor:
Johannes Ullmann, J. Vollbrecht, C. Trageser, T. Murböck, Thomas Stöhlker, Matthias Schmidt, Andreas Dax, Rodolfo Sánchez, Kristian König, W. Geithner, J. Meisner, Wilfried Nörtershäuser, B. Maaß, Stefan E. Schmidt, Carsten Brandau, Zoran Andelkovic, M. Hammen, S. Kaufmann, Richard C. Thompson, Matthias Lochmann, Yuri A. Litvinov, Markus Steck, Volker Hannen, Christian Gorges, Christopher Geppert, Christian Weinheimer
Publikováno v:
Journal of Physics B: Atomic, Molecular and Optical Physics. 52:085003
The LIBELLE experiment performed at the experimental storage ring (ESR) at the GSI Helmholtz Center for Heavy Ion Research in Darmstadt, Germany, has successfully determined the ground state hyperfine (HFS) splittings in hydrogen-like ($^{209}\rm{Bi}
Autor:
Andreas Dax, Zoran Andelkovic, J. Vollbrecht, J. Meisner, Michael Schmidt, T Murboeck, Yu. A. Litvinov, Ch. Weinheimer, Volker Hannen, M. Steck, Thomas Stöhlker, Richard C. Thompson, S. Kaufmann, C. Geppert, B. Maass, Matthias Lochmann, C. Gorges, Johannes Ullmann, R. Sánchez, Kristian König, M. Hammen, W. Geithner, Stefan E. Schmidt, Wilfried Nörtershäuser
Publikováno v:
17th International Conference on the Physics of Highly Charged Ions
The LIBELLE experiment performed at the experimental storage ring (ESR) at the GSI Helmholtz Center in Darmstadt aims for the determination of the ground state hyperfine (HFS) transitions and lifetimes in hydrogen-like (209Bi82+) and lithium-like (20
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0fdb45d2bcba8b5921ccfabd220d8669
http://hdl.handle.net/10044/1/41307
http://hdl.handle.net/10044/1/41307
Autor:
Th. Stöhlker, Danyal Winters, Gerhard Birkl, Th. Walther, M. Steck, Deng-Hong Zhang, T. Beck, Markus Loeser, Ulrich Schramm, Matthias Lochmann, Rodolfo Sánchez, F. Nolden, C. Dimopoulou, X. L. Ma, Peter Spiller, Johannes Ullmann, Wilfried Nörtershäuser, Benjamin Rein, Th. Kühl, M. Siebold, Jianqing Yang, Weiqiang Wen, Volker Hannen, Michael Bussmann
Publikováno v:
Physica Scripta. :014048
Laser cooling is a powerful technique to reduce the longitudinal momentum spread of stored relativistic ion beams. Based on successful experiments at the experimental storage ring at GSI in Darmstadt, of which we show some important results in this p
Autor:
Michael Schmidt, M. Steck, J. Vollbrecht, Ch. Geppert, M. Hammen, T. Murböck, Stefan E. Schmidt, Rodolfo Sánchez, Johannes Ullmann, J. Meisner, Yu. A. Litvinov, Th. Stöhlker, Andreas Dax, Zoran Andelkovic, Wilfried Nörtershäuser, R.C.A. Thompson, Ch Gorges, B. Maaß, Ch. Weinheimer, W. Geithner, S. Kaufmann, Kristian König, Matthias Lochmann, Volker Hannen
Publikováno v:
Physica Scripta. :014021
The hyperfine transitions in lithium-like and hydrogen-like bismuth were remeasured by direct laser spectroscopy at the experimental storage ring. For this we have now employed a voltage divider which enabled us to monitor the electron cooler voltage