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22 results on '"F. Nez"'

1. Accumulation of positrons from a LINAC based source

Author

Young Ju Ko, P.-P. Crépin, N. Paul, JJ Choi, André Rubbia, Jaison Lee, Paul-Antoine Hervieux, P. Debu, P. Comini, M. Staszczak, K.H. Park, P Froehlich, D. P. van der Werf, SK Kim, O. D. Dalkarov, Bruno Mansoulie, D. Won, Jean-Philippe Karr, G Janka, M. Matusiak, Laszlo Liszkay, G Mornacchi, Serge Reynaud, B. Tuchming, C. J. Baker, Laurent Hilico, A. Douillet, F. Nez, J.-Y. Roussé, S. Niang, R. Nishi, D. Lunney, Sebastian Wolf, Ferdinand Schmidt-Kaler, Alexei Voronin, J Gafriller, Moses Chung, Yasunori Yamazaki, Paul Indelicato, C. Regenfus, T. Kosinski, J. Rzadkiewicz, S. Wronka, S. Guellati, L. Dodd, Pierre Cladé, A. Welker, B. Latacz, A. Husson, M. Charlton, A Kleyheeg, Svante Jonsell, B. Vallage, ES Kim, Y. Sacquin, T Louvradoux, BH Kim, Naofumi Kuroda, Giovanni Manfredi, E. Lim, S. Nourbaksh, H Lee, Valery Nesvizhevsky, K.-H. Yoo, K. Lévêque, P. Perez, Johannes Heinrich, B. Radics, Amm Leite, Paolo Crivelli, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Swansea University, Seoul National University [Seoul] (SNU), Ulsan National Institute of Science and Technology (UNIST), Laboratoire Kastler Brossel (LKB (Jussieu)), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institute for Particle Physics and Astrophysics [ETH Zürich] (IPA), Department of Physics [ETH Zürich] (D-PHYS), Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich)- Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich), Laboratoire Kastler Brossel (LKB [Collège de France]), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Collège de France (CdF (institution)), P. N. Lebedev Physical Institute of the Russian Academy of Sciences [Moscow] (LPI RAS), Russian Academy of Sciences [Moscow] (RAS), Université d'Évry-Val-d'Essonne (UEVE), Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), Université de Strasbourg (UNISTRA)-Matériaux et nanosciences d'Alsace (FMNGE), Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich), National Centre for Nuclear Research [Otwock], Narodowe Centrum Badań Jądrowych (NCBJ), Johannes Gutenberg - Universität Mainz (JGU), CERN [Genève], RIKEN - Institute of Physical and Chemical Research [Japon] (RIKEN), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Collège de France (CdF (institution))-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Johannes Gutenberg - Universität Mainz = Johannes Gutenberg University (JGU), Département de Physique des Particules (ex SPP) (DPP), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Université Pierre et Marie Curie - Paris 6 (UPMC)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Department of Physics [Umeå], Umeå University, National Center for Nuclear Research (NCBJ), Centre for Water Research (CWR), The University of Western Australia (UWA), iMagX/MIRO, Université Catholique de Louvain = Catholic University of Louvain (UCL), Institut Laue-Langevin (ILL), ILL, Soltan Institute for Nuclear Studies, Institut für Quanteninformationsverarbeitung, Universität Ulm - Ulm University [Ulm, Allemagne], Lomonosov Moscow State University (MSU), Max-Planck-Institut für Astronomie (MPIA), Max-Planck-Gesellschaft, and Lancaster University

Subjects
010302 applied physics, Physics, Measure (physics), General Physics and Astronomy, 02 engineering and technology, 021001 nanoscience & nanotechnology, Gravitational acceleration, 01 natural sciences, Linear particle accelerator, Positronium, Nuclear physics, Positron, Positron plasma, Positron accumulation, Antimatter, Penning-Malmberg trap, Greaves-Surko trap, GBAR, [PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph], Antiproton, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Physics::Accelerator Physics, Physics::Atomic Physics, 0210 nano-technology, Antihydrogen, ComputingMilieux_MISCELLANEOUS
Abstract

International audience; The GBAR experiment aims to measure the gravitational acceleration of antihydrogen H̅. It will use H̅+ ions formed by the interaction of antiprotons with a dense positronium cloud, which will require about 1010 positrons to produce one H̅+. We present the first results on the positron accumulation, reaching 3.8±0.4×108 e+ collected in 560 s.

Published
2020

2. State of the art in the determination of the fine-structure constant and the ratio h/mu

Author

François Biraben, Saïda Guellati-Khélifa, Pierre Cladé, F. Nez, Laboratoire Kastler Brossel (LKB [Collège de France]), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Collège de France (CdF (institution)), Conservatoire National des Arts et Métiers [CNAM] (CNAM), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Collège de France (CdF)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire commun de métrologie LNE-CNAM (LCM), and Laboratoire National de Métrologie et d'Essais [Trappes] (LNE )-Conservatoire National des Arts et Métiers [CNAM] (CNAM)

Subjects
Atom interferometer, Atomic Physics (physics.atom-ph), Physical constant, Electron moment anomaly, FOS: Physical sciences, Energy Engineering and Power Technology, Fine structure constant, Type (model theory), Planck constant, 01 natural sciences, Physics - Atomic Physics, 010305 fluids & plasmas, Standard Model, symbols.namesake, Système d'unités international, Constante de structure fine, 0103 physical sciences, International System of Units, 010306 general physics, Physics, International system of units, General Engineering, Fine-structure constant, Atom interferometry, Interférométrie atomique, [PHYS.PHYS.PHYS-GEN-PH]Physics [physics]/Physics [physics]/General Physics [physics.gen-ph], Atomic mass, Moment magnétique anormal de l'électron, symbols, Atomic physics
Abstract

The fine structure constant $\alpha$ and the ratio $h/m_{\mathrm{u}}$ between the Planck constant and the unified atomic mass are keystone constants for the determination of other fundamental physical constants, especially the ones involved in the framework of the future International System of units. This paper presents how these two constants, which can be deduced from one another, are measured. We will present in detail the measurement of $h/m_\mathrm{Rb}$ performed by atomic interferometry at the Laboratoire Kastler Brossel in Paris. This type of measurement also allows a test of the standard model to be carried out with unparalleled accuracy., Comment: arXiv admin note: text overlap with arXiv:1309.3393

Published
2019

3. Measuring the α-particle charge radius with muonic helium-4 ions

Author

Sandrine Galtier, Julian J. Krauth, Andreas Knecht, Andreas Dax, D. Taqqu, Thomas Graf, Paul Indelicato, Yi-Wei Liu, Karsten Schuhmann, Andreas Voss, F. Mulhauser, Pedro Amaro, Malte Hildebrandt, D. S. Covita, L.M.P. Fernandes, Boris Naar, F. D. Amaro, Theodor W. Hänsch, Marwan Abdou Ahmed, José Paulo Santos, Andrea L. Gouvea, Lucile Julien, Randolf Pohl, Johannes Götzfried, F. Nez, Beatrice Franke, Jorge Machado, Tobias Nebel, C.M.B. Monteiro, J.F.C.A. Veloso, Joaquim M. F. dos Santos, François Biraben, Franz Kottmann, Marc Diepold, Csilla I. Szabo, Jens Hartmann, Jan Vogelsang, Klaus Kirch, Aldo Antognini, Tzu-Ling Chen, Birgit Weichelt, LaserLaB Vrije Universiteit Amsterdam (LaserLaB), Vrije Universiteit Amsterdam [Amsterdam] (VU), Max-Planck-Institute for Quantum Optics, Institut für Physik [Mainz], Johannes Gutenberg - Universität Mainz (JGU), Institute for Particle Physics and Astrophysics [ETH Zürich] (IPA), Department of Physics [ETH Zürich] (D-PHYS), Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich)- Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich), Paul Scherrer Institute (PSI), Institut für Strahlwerkzeuge, Universität of Stuttgart, Department of Physics [Coimbra], University of Coimbra [Portugal] (UC), Universidade Nova de Lisboa = NOVA University Lisbon (NOVA), Laboratoire Kastler Brossel (LKB [Collège de France]), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Collège de France (CdF (institution)), National Tsing Hua University [Hsinchu] (NTHU), Universidade de Aveiro, TRIUMF [Vancouver], Atmosphère, Optique et Spectroscopie (ATMOS), Institut Lumière Matière [Villeurbanne] (ILM), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Ludwig-Maximilians-Universität München (LMU), Theiss Research, Lund University [Lund], Atoms, Molecules, Lasers, LaserLaB - Physics of Light, DF – Departamento de Física, and LIBPhys-UNL

Subjects
Physics, [PHYS]Physics [physics], Multidisciplinary, Muon, Proton, 010308 nuclear & particles physics, Nuclear structure, Atomic spectroscopy, Electron, 01 natural sciences, 7. Clean energy, Article, Ion, [SPI]Engineering Sciences [physics], Charge radius, 0103 physical sciences, [CHIM]Chemical Sciences, Physics::Atomic Physics, Exotic atoms and molecules, Atomic physics, Experimental nuclear physics, 010306 general physics, Spectroscopy, General
Abstract

The energy levels of hydrogen-like atomic systems can be calculated with great precision. Starting from their quantum mechanical solution, they have been refined over the years to include the electron spin, the relativistic and quantum field effects, and tiny energy shifts related to the complex structure of the nucleus. These energy shifts caused by the nuclear structure are vastly magnified in hydrogen-like systems formed by a negative muon and a nucleus, so spectroscopy of these muonic ions can be used to investigate the nuclear structure with high precision. Here we present the measurement of two 2S–2P transitions in the muonic helium-4 ion that yields a precise determination of the root-mean-square charge radius of the α particle of 1.67824(83) femtometres. This determination from atomic spectroscopy is in excellent agreement with the value from electron scattering1, but a factor of 4.8 more precise, providing a benchmark for few-nucleon theories, lattice quantum chromodynamics and electron scattering. This agreement also constrains several beyond-standard-model theories proposed to explain the proton-radius puzzle2,3,4,5, in line with recent determinations of the proton charge radius6,7,8,9, and establishes spectroscopy of light muonic atoms and ions as a precise tool for studies of nuclear properties., Nature, 589 (7843), ISSN:0028-0836, ISSN:1476-4687

Published
2021

4. A pulsed high-voltage decelerator system to deliver low-energy antiprotons

Author

Valery Nesvizhevsky, K.-H. Yoo, J.-M. Reymond, P. Comini, B. Latacz, F. Nez, Alexei Voronin, Laurent Hilico, L. Dodd, P.-P. Crépin, M. Staszczak, B.H. Kim, Giuseppe Mornacchi, Jean-Philippe Karr, A. M. M. Leite, G. Janka, N. Garroum, S. Procureur, J.J. Choi, J.-Y. Roussé, J. Rzadkiewicz, Paul Indelicato, Hyo-Suk Lee, Pierre Cladé, M. Matusiak, B. Tuchming, T. Kosinski, P. Debu, Yasunori Yamazaki, Sun-Whe Kim, Eun-San Kim, A. Welker, Paolo Crivelli, M. Charlton, M. Chung, A. Husson, S. Wronka, S. Wolf, B. Vallage, O. D. Dalkarov, Y. Sacquin, C. Regenfus, S. Guellati-Khélifa, Naofumi Kuroda, R. Nishi, Serge Reynaud, Jaison Lee, S. Nourbaksh, Young Ju Ko, A. Douillet, Paul-Antoine Hervieux, D. Lunney, N. Paul, K. Lévêque, Giovanni Manfredi, P. Lotrus, P. Pérez, O. Rousselle, Bruno Mansoulie, E. Lim, Laszlo Liszkay, Svante Jonsell, K.H. Park, S. Niang, Ferdinand Schmidt-Kaler, André Rubbia, D. P. van der Werf, D. Won, B. Radics, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Seoul National University [Seoul] (SNU), CERN [Genève], Swansea University, Ulsan National Institute of Science and Technology (UNIST), Laboratoire Kastler Brossel (LKB [Collège de France]), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Collège de France (CdF (institution))-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institute for Particle Physics and Astrophysics [ETH Zürich] (IPA), Department of Physics [ETH Zürich] (D-PHYS), Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich)- Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich), P. N. Lebedev Physical Institute of the Russian Academy of Sciences [Moscow] (LPI RAS), Russian Academy of Sciences [Moscow] (RAS), Université d'Évry-Val-d'Essonne (UEVE), Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Stockholm University, Korea University [Seoul], Institute for Basic Science [Daejeon] (IBS), National Centre for Nuclear Research [Otwock], Narodowe Centrum Badań Jądrowych (NCBJ), The University of Tokyo (UTokyo), Institut Laue-Langevin (ILL), Johannes Gutenberg - Universität Mainz = Johannes Gutenberg University (JGU), RIKEN - Institute of Physical and Chemical Research [Japon] (RIKEN), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Collège de France (CdF (institution)), Université de Strasbourg (UNISTRA)-Matériaux et nanosciences d'Alsace (FMNGE), Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA), ILL, and Johannes Gutenberg - Universität Mainz (JGU)

Subjects
Nuclear and High Energy Physics, Drift tube, General Relativity, Ion-optic simulations, CERN Lab, drift tube, Astrophysics::High Energy Astrophysical Phenomena, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], Charged-particle optics, fabrication, 7. Clean energy, 01 natural sciences, anti-p: deceleration, law.invention, Nuclear physics, law, 0103 physical sciences, synchrotron, Physics::Atomic Physics, 010306 general physics, Antihydrogen, numerical calculations, Instrumentation, accelerator: design, Physics, antihydrogen, Large Hadron Collider, 010308 nuclear & particles physics, High voltage, Charged particle, Synchrotron, [PHYS.PHYS.PHYS-GEN-PH]Physics [physics]/Physics [physics]/General Physics [physics.gen-ph], Pulse (physics), beam optics, Antiproton, Physics::Accelerator Physics
Abstract

International audience; The GBAR (Gravitational Behavior of Antihydrogen at Rest) experiment at CERN requires efficient deceleration of 100 keV antiprotons provided by the new ELENA synchrotron ring to synthesize antihydrogen. This is accomplished using electrostatic deceleration optics and a drift tube that is designed to switch from -99 kV to ground when the antiproton bunch is inside – essentially a charged particle “elevator” – producing a 1 keV pulse. We describe the simulation, design, construction and successful testing of the decelerator device at -92 kV on-line with antiprotons from ELENA.

Published
2021

5. A magneto-gravitational trap for studies of gravitational quantum states

Author

Valery Nesvizhevsky, A. Yu. Voronin, F. Nez, E. Widmann, Sergey Vasiliev, Serge Reynaud, and Paolo Crivelli

Subjects
Physics, Physics and Astronomy (miscellaneous), Magnetic moment, 010308 nuclear & particles physics, lcsh:Astrophysics, 01 natural sciences, Magnetic field, Gravitation, Coupling (physics), Gravitational field, Quantum state, Quantum electrodynamics, 0103 physical sciences, Vertical direction, lcsh:QB460-466, Levitation, lcsh:QC770-798, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, 010306 general physics, Engineering (miscellaneous)
Abstract

Observation time is the key parameter for improving the precision of measurements of gravitational quantum states of particles levitating above a reflecting surface. We propose a new method of long confinement in such states of atoms, anti-atoms, neutrons and other particles possessing a magnetic moment. The earth gravitational field and a reflecting mirror confine particles in the vertical direction. The magnetic field originating from electric current passing through a vertical wire confines particles in the radial direction. Under appropriate conditions, motions along these two directions are decoupled to a high degree. We estimate characteristic parameters of the problem, and list possible systematic effects that limit storage times due to the coupling of the two motions., The European Physical Journal C, 80 (6), ISSN:1434-6044, ISSN:1434-6052

Published
2020

6. The CODATA 2017 values ofh,e,k, andNAfor the revision of the SI

Author

Peter J. Mohr, F Cabiati, Z Zhang, Barry N. Taylor, Savely G. Karshenboim, B M Wood, Terry Quinn, E. de Mirandes, Krzysztof Pachucki, Helen S. Margolis, M Wang, J Fischer, David B. Newell, K Fujii, and F. Nez

Subjects
Physics, General Engineering, Planck constant, Elementary charge, 01 natural sciences, 010309 optics, symbols.namesake, Units of measurement, Quantum mechanics, 0103 physical sciences, Avogadro constant, Boltzmann constant, symbols, Calculus, International System of Units, 010306 general physics
Abstract

Sufficient progress towards redefining the International System of Units (SI) in terms of exact values of fundamental constants has been achieved. Exact values of the Planck constant h, elementary charge e, Boltzmann constant k, and Avogadro constant N A from the CODATA 2017 Special Adjustment of the Fundamental Constants are presented here. These values are recommended to the 26th General Conference on Weights and Measures to form the foundation of the revised SI.

Published
2018

7. Gravitational and matter-wave spectroscopy of atomic hydrogen at ultra-low energies

Author

Jarno Järvinen, J. Ahokas, Serge Reynaud, Alexei Voronin, Sergey Vasiliev, Valery Nesvizhevsky, F. Nez, Institut Laue-Langevin (ILL), ILL, Laboratoire Kastler Brossel (LKB [Collège de France]), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Collège de France (CdF (institution)), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), and Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Collège de France (CdF)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear and High Energy Physics, Hydrogen, Quantum reflection, chemistry.chemical_element, 7. Clean energy, 01 natural sciences, Gravitation, BEC, Magnetic trap, 0103 physical sciences, Physics::Atomic Physics, Physical and Theoretical Chemistry, 010306 general physics, Spectroscopy, Antihydrogen, Condensed Matter::Quantum Gases, Physics, 010308 nuclear & particles physics, Atomic hydrogen, Condensed Matter Physics, Potential energy, [PHYS.PHYS.PHYS-GEN-PH]Physics [physics]/Physics [physics]/General Physics [physics.gen-ph], Atomic and Molecular Physics, and Optics, chemistry, 13. Climate action, Atomic physics, Superfluid helium-4
Abstract

International audience; We propose experiments with atomic hydrogen gas at ultra-low temperatures T

Published
2019

8. Positron production using a 9 MeV electron linac for the GBAR experiment

Author

B. Radics, Alexei Voronin, L. Dodd, S. Niang, Bruno Mansoulie, Ferdinand Schmidt-Kaler, Valery Nesvizhevsky, P.-P. Crépin, Paul Indelicato, A. Husson, K.-H. Yoo, T. Kosinski, B. Latacz, A. Welker, Eun-San Kim, P. Debu, Laszlo Liszkay, André Rubbia, J. Rzadkiewicz, R. Nishi, Pierre Cladé, D. Lunney, G. Janka, Y. Sacquin, Paolo Crivelli, D. P. van der Werf, O. Rousselle, Jaison Lee, J.-M. Rey, D. Won, B.H. Kim, Paul-Antoine Hervieux, Naofumi Kuroda, S. Wolf, P. Lotrus, E. Lim, P. Pérez, Giuseppe Mornacchi, Jean-Philippe Karr, O. D. Dalkarov, M. Charlton, C. Regenfus, S. Guellati-Khélifa, S. Nourbaksh, Serge Reynaud, A. Douillet, Svante Jonsell, J.-M. Reymond, S. K. Kim, F. Nez, J.-Y. Roussé, M. Staszczak, K.H. Park, Giovanni Manfredi, Hyo-Suk Lee, JJ Choi, Young Ju Ko, M. Matusiak, N. Paul, Laurent Hilico, Moses Chung, S. Wronka, B. Tuchming, Yasunori Yamazaki, K. Lévêque, B. Vallage, T Louvradoux, P. Comini, A. M. M. Leite, S. Procureur, Laboratoire Kastler Brossel (LKB [Collège de France]), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Collège de France (CdF (institution)), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), Université de Strasbourg (UNISTRA)-Matériaux et nanosciences d'Alsace (FMNGE), Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut Laue-Langevin (ILL), ILL, Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Collège de France (CdF (institution))-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)

Subjects
safety, Antimatter, Nuclear and High Energy Physics, CERN Lab, Physics - Instrumentation and Detectors, tungsten, Positron, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Electron, 01 natural sciences, 7. Clean energy, Linear particle accelerator, positron: particle source, 010305 fluids & plasmas, electron: pair production, Nuclear physics, electron: linear accelerator, Linear accelerator, Antihydrogen, Gravitation, 0103 physical sciences, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Detectors and Experimental Techniques, Nuclear Experiment, 010306 general physics, physics.ins-det, Instrumentation, energy: low, antihydrogen, Physics, Large Hadron Collider, gravitation 2, Instrumentation and Detectors (physics.ins-det), linear accelerator, Antiproton Decelerator, Pair production, radioactivity, gravitation: acceleration, Physics::Accelerator Physics, High Energy Physics::Experiment, performance, positron: yield
Abstract

For the GBAR (Gravitational Behaviour of Antihydrogen at Rest) experiment at CERN's Antiproton Decelerator (AD) facility we have constructed a source of slow positrons, which uses a low-energy electron linear accelerator (linac). The driver linac produces electrons of 9 MeV kinetic energy that create positrons from bremsstrahlung-induced pair production. Staying below 10 MeV ensures no persistent radioactive activation in the target zone and that the radiation level outside the biological shield is safe for public access. An annealed tungsten-mesh assembly placed directly behind the target acts as a positron moderator. The system produces $5\times10^7$ slow positrons per second, a performance demonstrating that a low-energy electron linac is a superior choice over positron-emitting radioactive sources for high positron flux., published in NIM A. 33 pages 9 figures

Published
2021

9. High Resolution Spectroscopy of 1S-3S Transition in Hydrogen with a CW Laser

Author

François Biraben, Marie Bonnaud, F. Nez, Helene Fleurbaey, Simon Thomas, L. Julien, and Sandrine Galtier

Subjects
Materials science, Proton, Hydrogen, chemistry.chemical_element, High resolution, Radius, Cw laser, 01 natural sciences, 010309 optics, Rydberg constant, chemistry, 0103 physical sciences, Physics::Atomic Physics, Atomic physics, 010306 general physics, Spectroscopy
Abstract

The aim of our experiment is to improve the spectroscopy of atomic hydrogen in order to determine the Rydberg constant and contribute to the proton radius puzzle. Our experimental setup allows us to reach a statistical uncertainty of 2.1 kHz on the measurement of the 1S-3S transition frequency. Our latest study of the systematic effects yields a new value of this transition frequency that is five times more precise than our previous determination, contributing to shedding light on the proton radius puzzle.

Published
2018

10. New Measurement of the 1S−3S Transition Frequency of Hydrogen: Contribution to the Proton Charge Radius Puzzle

Author

Michel Abgrall, L. Julien, Marie Bonnaud, F. Nez, François Biraben, Sandrine Galtier, Jocelyne Guéna, Helene Fleurbaey, and Simon Thomas

Subjects
Physics, Atomic beam, Hydrogen, Proton, 010308 nuclear & particles physics, General Physics and Astronomy, chemistry.chemical_element, 01 natural sciences, chemistry, Charge radius, 0103 physical sciences, Atomic physics, 010306 general physics, Spectroscopy, Excitation, Exotic atom
Abstract

We present a new measurement of the $1S\ensuremath{-}3S$ two-photon transition frequency of hydrogen, realized with a continuous-wave excitation laser at 205 nm on a room-temperature atomic beam, with a relative uncertainty of $9\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}13}$. The proton charge radius deduced from this measurement, ${r}_{p}=0.877(13)\text{ }\text{ }\mathrm{fm}$, is in very good agreement with the current CODATA-recommended value. This result contributes to the ongoing search to solve the proton charge radius puzzle, which arose from a discrepancy between the CODATA value and a more precise determination of ${r}_{p}$ from muonic hydrogen spectroscopy.

Published
2018

11. Spatial hole burning in thin-disk lasers and twisted-mode operation

Author

Gunther Wichmann, Klaus Kirch, Aldo Antognini, Randolf Pohl, Karsten Schuhmann, and F. Nez

Subjects
Physics, High power lasers, business.industry, Wavelength selectivity, FOS: Physical sciences, 02 engineering and technology, Polarizer, Laser, 01 natural sciences, Atomic and Molecular Physics, and Optics, law.invention, 010309 optics, 020210 optoelectronics & photonics, Optics, Thin disk, law, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Electrical and Electronic Engineering, business, Engineering (miscellaneous), Saturation (magnetic), Physics - Optics, Optics (physics.optics)
Abstract

Spatial hole burning prevents single-frequency operation of thin-disk lasers when the thin disk is used as a folding mirror. We present an evaluation of the saturation effects in the disk for disks acting as end-mirrors and as folding-mirrors explaining one of the main obstacles towards single-frequency operation. It is shown that a twisted-mode scheme based on a multi-order quarter-wave plate combined with a polarizer provides an almost complete suppression of spatial hole burning and creates an additional wavelength selectivity that enforces efficient single-frequency operation., Comment: 14 pages, 16 figures

Published
2018

12. Thirty years of hydrogen spectroscopy in Paris

Author

F. Nez, Lucile Julien, François Biraben, Laboratoire Kastler Brossel (LKB (Jussieu)), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Quantum optics, [PHYS]Physics [physics], Physics and Astronomy (miscellaneous), Hydrogen, General Engineering, General Physics and Astronomy, chemistry.chemical_element, Nanotechnology, 01 natural sciences, 010309 optics, Rydberg constant, chemistry, 0103 physical sciences, Atomic physics, 010306 general physics, Spectroscopy
Abstract

International audience; This paper gives a review of the experiments performed since the 1980s at the Laboratoire Kastler Brossel in Paris on two-photon spectroscopy of atomic hydrogen. Firstly devoted to the 2S–nS and 2S–nD transitions, they are currently running on the 1S–3S transition at 205 nm. During all that time, they were inspired by the plentiful ideas proposed by Ted Hänsch and were complementary with the measurements developed in parallel in his groups.This article is part of the topical collection “Enlightening the World with the Laser” - Honoring T. W. Hänsch guest edited by Tilman Esslinger, Nathalie Picqué, and Thomas Udem.

Published
2017

13. Cross-damping effects in 1S-3S spectroscopy of hydrogen and deuterium

Author

François Biraben, Jean-Philippe Karr, F. Nez, Lucile Julien, and Hélène Fleurbaey

Subjects
Physics, Hydrogen, Atomic Physics (physics.atom-ph), Frequency shift, chemistry.chemical_element, FOS: Physical sciences, 01 natural sciences, Fluorescence, 010305 fluids & plasmas, Physics - Atomic Physics, symbols.namesake, Nuclear magnetic resonance, chemistry, Deuterium, 0103 physical sciences, symbols, Physics::Atomic Physics, Atomic physics, Current (fluid), 010306 general physics, Spectroscopy, Raman scattering
Abstract

We calculate the cross-damping frequency shift of a laser-induced two-photon transition monitored through decay fluorescence, by adapting the analogy with Raman scattering developed by Amaro et al. [P. Amaro et al., PRA 92, 022514 (2015)]. We apply this method to estimate the frequency shift of the 1S-3S transition in hydrogen and deuterium. Taking into account our experimental conditions, we find a frequency shift of less than 1 kHz, that is smaller than our current statistical uncertainty., Comment: 7 pages, 5 figures

Published
2017
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14. Precise determination of the ratio h / m u : a way to link microscopic mass to the new kilogram

Author

François Biraben, Saïda Guellati-Khélifa, F. Nez, Lucile Julien, Pierre Cladé, Laboratoire Kastler Brossel (LKB (Jussieu)), Université Pierre et Marie Curie - Paris 6 (UPMC)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Centre d'enseignement Cnam Paris (CNAM Paris), Conservatoire National des Arts et Métiers [CNAM] (CNAM), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), and HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)

Subjects
Molar mass constant, Physics, [PHYS]Physics [physics], Kilogram, General Engineering, Planck constant, 01 natural sciences, Atomic units, 010309 optics, Nuclear physics, symbols.namesake, Theoretical physics, Atomic mass constant, 0103 physical sciences, Avogadro constant, symbols, Atomic recoil, 010306 general physics, Watt balance
Abstract

International audience; The ratio h/m u between the Planck constant and the unified atomic mass constant should have a special status in the framework of the future International System of Units. Currently (before the redefinition), this ratio allows to compare determinations of h (watt balance) and determinations of m u (XRCD method). In the future SI, as the Planck constant h will be fixed, the ratio h/m u will ensure the realization of the new kilogram (quantum kilogram) at the atomic scale. Furthermore as the Avogadro constant will be fixed, the carbon molar mass M(12 C), which will no longer be equal to 12 g · mol −1 , will be determined from m u. This ratio is also a key data for the realization of the kilogram at the macroscopic scale using the XRCD method. In this paper we present the state of the art on experiments that provide the most precise value of the ratio h/m u. We focus on the one based on the measurement of the atomic recoil due to the photon momentum.

Published
2016

15. Towards a test of the weak equivalence principle of gravity using anti-hydrogen at CERN

Author

D. Banerjee, F. Biraben, M. Charlton, P. Clade, P. Comini, P. Crivelli, O. Dalkarov, P. Debu, L. Dodd, A. Douillet, G. Dufour, P. Dupre, S. Eriksson, P. Froelich, P. Grandemange, S. Guellati, R. Guerout, J. M. Heinrich, P.-A. Hervieux, L. Hilico, A. Husson, P. Indelicato, S. Jonsell, J.-P. Karr, K. Khabarova, S.K. Kim, Y. Kim, N. Kolachevsky, N. Kuroda, A. Lambrecht, A. M. M. Leite, L. Liszkay, P. Lotrus, D. Lunney, N. Madsen, G. Manfredi, B. Mansouli, Y. Matsuda, A. Mohri, G. Mornacchi, V. Nesvizhevsky, F. Nez, P. Perez, C. Regenfus, J.-M. Rey, J.-M. Reymond, J-Y Rousse, S. Reynaud, A. Rubbia, Y. Sacquin, F. Schmidt-Kaler, N. Sillitoe, M. Staszczak, H. Torii, B. Vallage, M. Valdes, D. P. van der Werf, A. Voronin, J. Walz, S. Wolf, S. Wronka, Y. Yamazaki, Laboratoire Kastler Brossel (LKB [Collège de France]), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Collège de France (CdF (institution)), Université Pierre et Marie Curie - Paris 6 (UPMC), Collège de France (CdF (institution)), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Département de Physique des Particules (ex SPP) (DPP), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut Laue-Langevin (ILL), ILL, Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Collège de France (CdF (institution))-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Département de Physique des Particules (ex SPP) (DPhP), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Collège de France (CdF)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Collège de France (CdF), and Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Free fall, Gravity (chemistry), Particle physics, Physics::General Physics, Antimatter, CERN Lab, Gravity, acceleration measurement, terrestrial gravitational field, free fall acceleration, 01 natural sciences, antihydrogen: acceleration, weak equivalence principle, 010305 fluids & plasmas, particle traps, Atomic measurements, Gravitation, General Relativity and Quantum Cosmology, hydrogen: ion, Gravitational field, Laser transitions, Atom (measure theory), 0103 physical sciences, Physics::Atomic and Molecular Clusters, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], 010306 general physics, Antihydrogen, antihydrogen atom, Physics, Ions, atom, Production, Equivalence principle (geometric), laser, equivalence principle, [PHYS.GRQC]Physics [physics]/General Relativity and Quantum Cosmology [gr-qc], talk: Ottawa 2016/07/10, gravitation: local, hydrogen ions, Cooling
Abstract

International audience; The aim of the GBAR (Gravitational Behavior of Antimatter at Rest) experiment is to measure the free fall acceleration of an antihydrogen atom, in the terrestrial gravitational field at CERN and therefore test the Weak Equivalence Principle with antimatter. The aim is to measure the local gravity with a 1% uncertainty which can be reduced to few parts of 10-3.

Published
2016

16. High resolution spectroscopy of 1S-3S transition in hydrogen

Author

Hélène Fleurbaey, F. Nez, Lucile Julien, Sandrine Galtier, François Biraben, Pierre Cladé, and Salda Guellati

Subjects
Materials science, Proton, Hydrogen, Laser source, High resolution, chemistry.chemical_element, 02 engineering and technology, Radius, 01 natural sciences, 010309 optics, 020401 chemical engineering, chemistry, Charge radius, 0103 physical sciences, Physics::Atomic Physics, 0204 chemical engineering, Atomic physics, Spectroscopy
Abstract

The aim of our experiment is to improve the spectroscopy of atomic hydrogen in order to determine the charge radius of the proton. A new continuous laser source at 205 nm allows us to reach a statistical uncertainty of 2.2 kHz on the measurement of the 1S-3S transition frequency. This uncertainty could be sufficient to clarify the proton radius puzzle, however there remain systematic effects that are currently under study.

Published
2016

17. Laser spectroscopy of muonic deuterium: New contribution to the proton puzzle

Author

Theodor W. Hänsch, E.-O. Le Bigot, J. A. M. Lopes, Marc Diepold, Françoise Mulhauser, D. S. Covita, L.M.P. Fernandes, Th. Graf, João Cardoso, Franz Kottmann, Y. Wei Liu, Tobias Nebel, Lukas A. Schaller, Adolf Giesen, F. D. Amaro, Catherine Schwob, J.F.C.A. Veloso, F. Nez, Satish Dhawan, Livia Ludhova, David Taqqu, François Biraben, Karsten Schuhmann, Aldo Antognini, Paul Rabinowitz, Andrea L. Gouvea, J.M.F. dos Santos, Randolf Pohl, Lucile Julien, Paul E. Knowles, Paul Indelicato, C.M.B. Monteiro, and Andreas Dax

Subjects
Physics, Proton, Nuclear structure, 02 engineering and technology, 01 natural sciences, Lamb shift, Nuclear physics, 020210 optoelectronics & photonics, Rydberg constant, Deuterium, Charge radius, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Atomic physics, 010306 general physics, Spectroscopy, Exotic atom
Abstract

We report the first laser spectroscopy of muonic deuterium. At the Paul Scherrer Institute, we have measured the frequency of the 2S-2P Lamb shift in muonic deuterium. As in the case of the muonic hydrogen, the observed lines are shifted from the theoretical predictions. Thanks to improved new QED and nuclear structure calculations, an accurate determination of the deuteron radius can be extracted from our study. This determination will give a new and important input to the proton size puzzle.

Published
2016
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18. Illuminating the proton radius conundrum: the μHe+ Lamb shiftThis paper was presented at the International Conference on Precision Physics of Simple Atomic Systems, held at École de Physique, les Houches, France, 30 May – 4 June, 2010

Author

J.M.F. dos Santos, L. Julien, A. Voss, F. Nez, Andreas Dax, Theodor W. Hänsch, Paul Indelicato, João Cardoso, François Biraben, L.M.P. Fernandes, F. Mulhauser, Andrea L. Gouvea, J.F.C.A. Veloso, Randolf Pohl, K. Schuhmann, Yi-Wei Liu, Klaus Kirch, Tobias Nebel, Aldo Antognini, Malte Hildebrandt, D. S. Covita, Th. Graf, D. Taqqu, F. Kottmann, and C.M.B. Monteiro

Subjects
Physics, 010308 nuclear & particles physics, Ab initio, General Physics and Astronomy, Radius, Polarization (waves), 7. Clean energy, 01 natural sciences, Charged particle, Lamb shift, Nuclear physics, Charge radius, 0103 physical sciences, Atomic physics, 010306 general physics, Spectroscopy, Hyperfine structure
Abstract

We plan to measure several 2S–2P transition frequencies in μ4He+ and μ3He+ by means of laser spectroscopy with an accuracy of 50 ppm. This will lead to a determination of the corresponding nuclear rms charge radii with a relative accuracy of 3 × 10−4, limited by the uncertainty of the nuclear polarization contribution. First, these measurements will help to solve the proton radius puzzle. Second, these very precise nuclear radii are benchmarks for ab initio few-nucleon theories and potentials. Finally when combined with an ongoing measurement of the 1S–2S transition in He+, these measurements will lead to an enhanced bound-state QED test of the 1S Lamb shift in He+.

Published
2011

19. The GBAR antimatter gravity experiment

Author

André Rubbia, D. G. Brook-Roberge, D. P. van der Werf, François Biraben, Sebastian Wolf, Gabriel Dufour, J.-M. Reymond, C. Regenfus, P. Dupre, F. Nez, Niels Madsen, Paolo Crivelli, Nikolai N. Kolachevsky, Serge Reynaud, Piotr Froelich, Ferdinand Schmidt-Kaler, C. I. Szabo-Foster, Alexei Voronin, Laszlo Liszkay, Bruno Mansoulie, Yasuyuki Nagashima, Y. Sacquin, P. Comini, Stefan Eriksson, K. Khabarova, H. A. Torii, S. Guellati, A. Mohri, Naofumi Kuroda, O. D. Dalkarov, A. Douillet, B. Vallage, Yasuyuki Matsuda, Jean-Philippe Karr, S. Wronka, A. M. M. Leite, Johannes Heinrich, D. Banerjee, M. Charlton, Paul Indelicato, Yasunori Yamazaki, Astrid Lambrecht, Romain Guérout, Giovanni Manfredi, T. Mortensen, Jochen Walz, P. Clade, Valery Nesvizhevsky, David Lunney, P. Grandemange, A. Husson, Svante Jonsell, M. Staszczak, P. Perez, Nicolas Sillitoe, M. Valdes, Laurent Hilico, Jean-Michel Rey, Paul-Antoine Hervieux, and P. Debu

Subjects
Free fall, Physics, Nuclear and High Energy Physics, Hydrogen, 010308 nuclear & particles physics, chemistry.chemical_element, Condensed Matter Physics, 01 natural sciences, 7. Clean energy, Atomic and Molecular Physics, and Optics, Positronium, Nuclear physics, Gravitation, chemistry, Gravitational field, Antiproton, 13. Climate action, Antimatter, 0103 physical sciences, Physics::Atomic Physics, Physical and Theoretical Chemistry, Atomic physics, 010306 general physics, Antihydrogen
Abstract

The GBAR project (Gravitational Behaviour of Anti hydrogen at Rest) at CERN, aims to measure the free fall acceleration of ultracold neutral anti hydrogen atoms in the terrestrial gravitational field. The experiment consists preparing anti hydrogen ions (one antiproton and two positrons) and sympathetically cooling them with Be (+) ions to less than 10 mu K. The ultracold ions will then be photo-ionized just above threshold, and the free fall time over a known distance measured. We will describe the project, the accuracy that can be reached by standard techniques, and discuss a possible improvement to reduce the vertical velocity spread.

Published
2015

20. Atom interferometry based on light pulses : application to the high precision measurement of the ratio h/m and the determination of the fine structure constant

Author

Lucile Julien, Saïda Guellati-Khélifa, Pierre Cladé, F. Nez, Malo Cadoret, F. Biraben, E. De Mirandes, Laboratoire Kastler Brossel (LKB (Jussieu)), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire commun de métrologie LNE-CNAM (LCM), Laboratoire National de Métrologie et d'Essais [Trappes] (LNE )-Conservatoire National des Arts et Métiers [CNAM] (CNAM), HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM), Université Pierre et Marie Curie - Paris 6 (UPMC)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Atom interferometer, Atomic Physics (physics.atom-ph), FOS: Physical sciences, General Physics and Astronomy, Planck constant, 01 natural sciences, Physics - Atomic Physics, 010305 fluids & plasmas, symbols.namesake, Optics, 0103 physical sciences, Quantum metrology, General Materials Science, Physical and Theoretical Chemistry, 010306 general physics, Physics, Optical lattice, [PHYS.PHYS.PHYS-ATOM-PH]Physics [physics]/Physics [physics]/Atomic Physics [physics.atom-ph], business.industry, Fine-structure constant, Atomic mass, Interferometry, symbols, Bloch oscillations, Atomic physics, business
Abstract

International audience; In this paper we present a short overview of atom interferometry based on light pulses. We discuss different implementations and their applications for high precision measurements. We will focus on the determination of the ratio h/m of the Planck constant to an atomic mass. The measurement of this quantity is performed by combining Bloch oscillations of atoms in a moving optical lattice with a Ramsey-Bordé interferometer.

Published
2009

21. Proposal for new experimental schemes to realize the Avogadro constant

Author

P. Clad, E. de Mirandes, P. Gournay, F. Nez, Malo Cadoret, G. Genevs, F. Biraben, L. Julien, Patrick Juncar, S. Guellati-Khlifa, Laboratoire Kastler Brossel (LKB (Jussieu)), Université Pierre et Marie Curie - Paris 6 (UPMC)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Laboratoire National de Métrologie et d'Essais [Trappes] (LNE ), Laboratoire commun de métrologie LNE-CNAM (LCM), Laboratoire National de Métrologie et d'Essais [Trappes] (LNE )-Conservatoire National des Arts et Métiers [CNAM] (CNAM), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), and HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)

Subjects
Condensed Matter::Quantum Gases, Physics, Josephson effect, Atomic Physics (physics.atom-ph), 020208 electrical & electronic engineering, General Engineering, FOS: Physical sciences, 02 engineering and technology, Quantum Hall effect, Planck constant, 01 natural sciences, [PHYS.PHYS.PHYS-GEN-PH]Physics [physics]/Physics [physics]/General Physics [physics.gen-ph], Physics - Atomic Physics, symbols.namesake, Ultracold atom, Quantum mechanics, 0103 physical sciences, Avogadro constant, 0202 electrical engineering, electronic engineering, information engineering, symbols, Atomic physics, 010306 general physics, Watt balance
Abstract

International audience; We propose two experimental schemes to determine and so to realize the Avogadro constant $N_{A}$ at the level of 10$^{-7}$ or better with a watt balance experiment and a cold atom experiment measuring $h/m(X)$ (where $h$ is the Planck constant and $m(X)$ the mass of the atom $X$). We give some prospects about achievable uncertainties and we discuss the opportunity to test the existence of possible unknown correction factors for the Josephson effect and quantum Hall effect.

Published
2006

22. Frequency measurement of the 2S-12D transitions in hydrogen and deuterium, new determination of the Rydberg constant

Author

L. Jozefowski, F. Nez, Laurent Hilico, F. Biraben, André Clairon, B. de Beauvoir, Catherine Schwob, Ouali Acef, L. Julien, Laboratoire Kastler Brossel (LKB (Jussieu)), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Systèmes de Référence Temps Espace (SYRTE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, Optical fiber, Hydrogen, Laser diode, [PHYS.PHYS.PHYS-ATOM-PH]Physics [physics]/Physics [physics]/Atomic Physics [physics.atom-ph], chemistry.chemical_element, Laser, 7. Clean energy, 01 natural sciences, Rubidium, law.invention, 010309 optics, Rydberg constant, chemistry, Deuterium, law, 0103 physical sciences, Molecule, Electrical and Electronic Engineering, Atomic physics, 010306 general physics, Instrumentation, ComputingMilieux_MISCELLANEOUS
Abstract

We have performed the first pure frequency measurement of the 2S-12D two-photon transitions in atomic hydrogen and deuterium. These frequencies are compared to two optical standards, the CO/sub 2/ laser stabilized on the OsO/sub 4/ molecule and the optical rubidium laser standard (LD/Rb) (namely, a laser diode at 778 nm stabilized on the 5S/sub 1/2/-5D/sub 5/2/ two-photon transition of rubidium). The main part of the experiment is located in the Laboratoire Kastler-Brossel (LKB), one part of the frequency chain is in the Laboratoire Primaire du Temps et des Frequences (LPTF), and two 3 km long optical fibers link the two parts of this experiment. The new value of the Rydberg constant is R/sub /spl infin//=109 737.315 686 06 (79) cm/sup -1/.

Published
1999

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