Search results for "Precision tests of QED"

showing 3 items of 3 documents

Lifetimes and g-factors of the HFS states in H-like and Li-like bismuth

2018

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 ($^{209}\rm{Bi}^{82+}$) and lithium-like ($^{209}\rm{Bi}^{80+}$) bismuth. The study of HFS transitions in highly charged ions enables precision tests of QED in extreme electric and magnetic fields otherwise not attainable in laboratory experiments. Besides the transition wavelengths the time resolved detection of fluorescence photons following the excitation of the ions by a pulsed laser system also allows to extract lifetimes of the upper HFS levels and g-fac…

IONSGeneral PhysicsAtomic Physics (physics.atom-ph)0205 Optical PhysicsFOS: Physical scienceschemistry.chemical_elementg-factorsElectronPhysics Atomic Molecular & ChemicalHYPERFINE01 natural sciencesPhysics - Atomic PhysicsIonBismuth0103 physical sciences0307 Theoretical and Computational ChemistryPhysics::Atomic Physicshyperfine transitions010306 general physicsHyperfine structurePrecision tests of QEDPhysicsScience & Technology010308 nuclear & particles physicsPhysicsOpticsCondensed Matter PhysicsAtomic and Molecular Physics and OpticsMagnetic fieldchemistryPhysical Sciences0202 Atomic Molecular Nuclear Particle and Plasma PhysicslifetimesAtomic physicsGround statehighly charged ionsExcitationJournal of Physics B: Atomic, Molecular and Optical Physics
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Laser spectroscopy of the ground-state hyperfine structure in H-like and Li-like bismuth

2014

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 (209Bi80+) bismuth. The study of HFS transitions in highly charged ions enables precision tests of QED in extreme electric and magnetic fields otherwise not attainable in laboratory experiments. While the HFS transition in H-like bismuth was already observed in earlier experiments at the ESR, the LIBELLE experiment succeeded for the first time to measure the HFS transition in Li-like bismuth in a laser spectroscopy experiment.

Precision tests of QEDHistory02 Physical Scienceschemistry.chemical_elementCharged particle09 EngineeringComputer Science ApplicationsEducationBismuthIonMagnetic fieldCondensed Matter::Materials SciencechemistryPhysics::Atomic PhysicsAtomic physicsGround stateSpectroscopyNuclear ExperimentHyperfine structure
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Precision tests of QED and non-standard models by searching photon-photon scattering in vacuum with high power lasers

2009

We study how to search for photon-photon scattering in vacuum at present petawatt laser facilities such as HERCULES, and test Quantum Electrodynamics and non-standard models like Born-Infeld theory or scenarios involving minicharged particles or axion-like bosons. First, we compute the phase shift that is produced when an ultra-intense laser beam crosses a low power beam, in the case of arbitrary polarisations. This result is then used in order to design a complete test of all the parameters appearing in the low energy effective photonic Lagrangian. In fact, we propose a set of experiments that can be performed at HERCULES, eventually allowing either to detect photon-photon scattering as du…

Precision tests of QEDPhysicsNuclear and High Energy PhysicsPhotonPVLASScatteringbusiness.industryPhysics beyond the Standard ModelFOS: Physical sciencesLaserComputational physicsStandard Modellaw.inventionHigh Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)lawPhotonicsbusinessPhysics - OpticsOptics (physics.optics)
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