Výsledky vyhledávání - "S. Friedreich"

Liquid helium-free cryostat and hermetically sealed cryogenic microwave cavity for hyperfine spectroscopy of antiprotonic helium

Autor: O. Massiczek, Johann Zmeskal, B. Juhász, Eberhard Widmann, S. Friedreich

Publikováno v: Nuclear Instruments & Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment

The design and properties of a new cryogenic set-up for laser–microwave–laser hyperfine structure spectroscopy of antiprotonic helium – an experiment performed at the CERN-Antiproton Decelerator (AD), Geneva, Switzerland – are described. Simi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2ef0a4e01b54ed86b5824cc9f488ce89
https://doi.org/10.1016/j.nima.2011.07.039

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Antiproton magnetic moment determined from the HFS of p¯He+

Autor: Andreas Dax, B. Juhász, O. Massiczek, Ryugo S. Hayano, Dezso Horvath, S. Friedreich, D. Barna, Anna Sótér, T. Pask, Eberhard Widmann, N. Ono, Masaki Hori

Publikováno v: Physics Letters B. 678:55-59

We report a determination of the antiproton magnetic moment, measured in a three-body system, independent of previous experiments. We present results from a systematic study of the hyperfine (HF) structure of antiprotonic helium where we have achieve

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c04cf200c22c8073e55e3b332cc350a1
https://doi.org/10.1016/j.physletb.2009.05.038

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Observation of positronium annihilation in the 2S state: towards a new measurement of the 1S-2S transition frequency

Autor: André Rubbia, Paolo Crivelli, V. Vrankovic, B. Brown, T. W. Haensch, S. Friedreich, D. A. Cooke, A. Gabard, Klaus Kirch, Aldo Antognini, Janis Alnis

Publikováno v: EXA 2014 ISBN: 9783319450162
Hyperfine Interactions, 233 (1)
Proceedings of the International Conference on Exotic Atoms and Related Topics (EXA 2014)
Hyperfine Interact.
Hyperfine Interactions

We report the first observation of the annihilation of positronium from the 2S state. Positronium (Ps) is excited with a two-photon transition from the 1S to the 2S state where its lifetime is increased by a factor of eight compared to the ground sta

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3a1817ebd0177c85ac9a43ff2c7290e9

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Antiproton–to–electron mass ratio determined by two-photon laser spectroscopy of antiprotonic helium atoms

Autor: Andreas Dax, Masaki Hori, S. Friedreich, D. Barna, L. Venturelli, Anna Sótér, T. Pask, Dezso Horvath, Eberhard Widmann, B. Juhász, Ryugo S. Hayano, N. Zurlo

Publikováno v: EPJ Web of Conferences, Vol 66, p 05020 (2014)
EPJ Web of Conferences

The ASACUSA collaboration of CERN has recently carried out two-photon laser spectroscopy of antiprotonic helium atoms. Three transition frequencies were de- termined with fractional precisions of 2.3-5 parts in 10 9 . By comparing the results with th

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::71ed76e5472e46d955b61c47f400002f
https://doaj.org/article/419599ed15944069b6a8796a106a4b51

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Spectroscopy apparatus for the measurement of the hyperfine structure of antihydrogen

Autor: M. C. Simon, S. Friedreich, B. Kolbinger, Chloé Malbrunot, O. Massiczek, Sebastian Lehner, B. Radics, Michael Wolf, Johann Zmeskal, Rikard Lundmark, Eberhard Widmann, M. Diermaier, N. Dilaver, B. Wünschek, C. Sauerzopf, Peter Caradonna

Publikováno v: Hyperfine Interactions

The ASACUSA CUSP collaboration at the Antiproton Decelerator (AD) of CERN is planning to measure the ground-state hyperfine splitting of antihydrogen using an atomic spectroscopy beamline. We describe here the latest developments on the spectroscopy

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2d3de051c666cf7fe0adee7e1187812b

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Experimental considerations for testing antimatter antigravity using positronium 1S-2S spectroscopy

Autor: D. A. Cooke, Paolo Crivelli, S. Friedreich

Publikováno v: Int. J. Mod. Phys. Conf. Ser.

In this contribution to the WAG 2013 workshop we report on the status of our measurement of the 1S-2S transition frequency of positronium. The aim of this experiment is to reach a precision of 0.5 ppb in order to cross check the QED calculations. Aft

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f74aba85127332ab8a80e0061700309e
http://www.worldscientific.com/toc/ijmpcs/30

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Two-photon laser spectroscopy of antiprotonic helium and the antiproton-electron mass ratio

Autor: B. Juhász, S. Friedreich, Nicola Zurlo, L. Venturelli, Dezso Horvath, Andreas Dax, Eberhard Widmann, T. Pask, D. Barna, Anna Sótér, Masaki Hori, Ryugo S. Hayano

Publikováno v: AIP Conference Proceedings.

We report our latest results from our two-photon spectroscopy of antiprotonic helium (a bound state of a helium nucleus, an electron and an antiproton). By measuring three transition frequencies with a precision of 2.3−5×10−9 and comparing these

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::87590f533b916c92c1f6c87f5338e39a
https://doi.org/10.1063/1.4826739

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First observation of two hyperfine transitions in antiprotonic He

Autor: S, Friedreich, D, Barna, F, Caspers, A, Dax, R S, Hayano, M, Hori, D, Horváth, B, Juhász, T, Kobayashi, O, Massiczek, A, Sótér, K, Todoroki, E, Widmann, J, Zmeskal

Publikováno v: Physics Letters. [Part B]

We report on the first experimental results for microwave spectroscopy of the hyperfine structure of p¯3He+. Due to the helium nuclear spin, p¯3He+ has a more complex hyperfine structure than p¯4He+, which has already been studied before. Thus a c

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=pmid________::d57ebab1df76d8af73414fc68d788c42
https://pubmed.ncbi.nlm.nih.gov/21822351

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