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Hamamatsu Corp. - Earth Innovations LB 2/24

The Proton Just Got Smaller

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VILLIGEN, Switzerland, July 12, 2010 — In a discovery that could poke holes in the theory of quantum electrodynamics (QED), scientists have discovered that the proton, one of the smallest building blocks of all matter, is actually 4 percent smaller than previously thought. Part of the laser facility needed for the experiment for the determination of the radius of the proton. Here, invisible infrared laser pulses are transformed into green laser light. (PSI/F. Reiser) The threatened theory describes how light and matter interact and has provided many successful and highly precise predictions of atomic properties. The...Read full article

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    Published: July 2010
    0.84184 femtometer0.8768 femtometerAldo Antogniniatomic propertiesatomic spectroscopyatomic spectrumBasic Sciencecharge radiusDausinger & Giesen GmbHEuropeFranz Kottmannheliumhudrogen atomInstitute for Particle PhysicsInstitute für StrahlwerkzeugeLaboratoire Kastler Brossellight and matterLight SourcesMax-Planck Institute of Quantum Opticsmuonmuon beamPaul Scherrer Instituteprotonquantum electrodynamicsRandolf PohlResearch & TechnologyRydberg constantSensors & DetectorsSwiss Federal Institute of TechnologyTest & MeasurementUniversity of FribourgLasers

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