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QED-PROTONSIZE SIGNED

The Proton Size Puzzle: Testing QED at Extreme Wavelengths

Total Cost €

0

EC-Contrib. €

0

Partnership

0

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 QED-PROTONSIZE project word cloud

Explore the words cloud of the QED-PROTONSIZE project. It provides you a very rough idea of what is the project "QED-PROTONSIZE" about.

theoretical    paul    vacuum    interpreting    energy    near    opportunity    evaluation    trapped    ground    molecules    shed    3he    limiting    particle    ongoing    atoms    discrepancies    comb    accounted    direct    tested    physics    electron    ramsey    experimental    alpha    unprecedented    model    2p    theory    normal    structure    magnetic    thereby    laser    electrodynamics    4he    spectroscopic    muonic    helium    nm    extreme    transition    fluctuations    atomic    fold    hydrogen    advantages    muon    effect    shifts    moment    efforts    breaking    puzzle    longer    ultraviolet    successful    decades    sub    platform    perform    light    precision    magnitude    radius    khz    standard    1s    larger    nuclear    scherrer    he    measured    crema    spectroscopy    anomalous    quantum    small    tests    qed    2010    explains       despite    ion    proton    ions    size    unsolved    2s    accuracy    electronic    isotopes    sigma    correct    replaced   

Project "QED-PROTONSIZE" data sheet

The following table provides information about the project.

Coordinator
STICHTING VU 

Organization address
address: DE BOELELAAN 1105
city: AMSTERDAM
postcode: 1081 HV
website: www.vu.nl

contact info
title: n.a.
name: n.a.
surname: n.a.
function: n.a.
email: n.a.
telephone: n.a.
fax: n.a.

 Coordinator Country Netherlands [NL]
 Project website https://few.vu.nl/
 Total cost 2˙497˙664 €
 EC max contribution 2˙497˙664 € (100%)
 Programme 1. H2020-EU.1.1. (EXCELLENT SCIENCE - European Research Council (ERC))
 Code Call ERC-2015-AdG
 Funding Scheme ERC-ADG
 Starting year 2016
 Duration (year-month-day) from 2016-09-01   to  2021-08-31

 Partnership

Take a look of project's partnership.

# participants  country  role  EC contrib. [€] 
1    STICHTING VU NL (AMSTERDAM) coordinator 2˙497˙664.00

Map

 Project objective

A key component of the Standard Model is Quantum Electrodynamics (QED). QED explains e.g. the anomalous magnetic moment of the electron and small energy shifts in the energy structure of atoms and molecules due to vacuum fluctuations. After decades of precision measurements, especially laser spectroscopy in atomic hydrogen, QED is considered the most successful and best-tested theory in physics. However, in 2010 precision spectroscopy in muonic-hydrogen (where the electron is replaced with a muon) has lead to discrepancies in energy level structure that cannot be accounted for. If QED is considered correct, then one way of interpreting the results is that the size of the proton is different in normal (electronic) hydrogen by as much as 4% (a 7 sigma effect) compared to muonic hydrogen. Despite great theoretical and experimental efforts, this 'proton size puzzle' is still unsolved.

I propose to perform precision spectroscopy in the extreme ultraviolet near 30 nm in the helium ion, to establish an exciting new platform for QED tests and thereby shed light on the proton-size puzzle. The advantages of helium ions over hydrogen atoms are that they can be trapped (observed longer), QED effects are more than an order of magnitude larger, and the nuclear size of the alpha particle is better known than the proton. Moreover, the CREMA collaboration has recently measured the 2S-2P transition in muonic He (both 3He and 4He isotopes) at the Paul Scherrer Institute. Evaluation of the measurements is ongoing, but could lead to an 8 fold (or more) improved alpha-particle radius, so that it is no longer limiting QED theory in normal He. I will use several ground-breaking methods such as Ramsey-comb spectroscopy in the extreme ultraviolet to measure the 1S-2S transition in trapped normal electronic He, with (sub) kHz spectroscopic accuracy. This will provide a unique and timely opportunity for a direct comparison of QED in electronic and muonic systems at an unprecedented level.

 Publications

year authors and title journal last update
List of publications.
2019 Nicolas Hölsch, Maximilian Beyer, Edcel J. Salumbides, Kjeld S. E. Eikema, Wim Ubachs, Christian Jungen, Frédéric Merkt
Benchmarking Theory with an Improved Measurement of the Ionization and Dissociation Energies of H 2
published pages: 103002, ISSN: 0031-9007, DOI: 10.1103/physrevlett.122.103002
Physical Review Letters 122/10 2019-09-18

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