Koordinatoren des Kolloquiums:
Prof. Dr. Pedro Schwaller
Institut für Physik, THEP
Johannes Gutenberg-Universität
Prof. Dr. Hartmut Wittig
Institut fuer Kernphysik,
Johannes Gutenberg-Universitaet

Physikalisches Kolloquium Mainz

Institut für Kernphysik, Johann Joachim Becher Weg 45

Dienstag, den 20.06.2017 um 16 Uhr c.t. im MPI - Staudinger Hörsaal
Tee ab 15:45 Uhr

Antrittsvorlesung - Achtung, geänderter Ort!

Shrinking the Proton – Laser spectroscopy of muonic atoms an ions

Prof. Dr. Randolf Pohl, Institut für Physik, Universität Mainz

In muonic atoms, the atomic electrons are replaced by a single muon. Due to the large muon mass and correspondingly tiny Bohr orbit, nuclear structure effects are vastly enhanced. We have performed laser spectroscopy on muonic hydrogen, deuterium, and helium-3 and -4 ions, with surpising results. Our value of the proton and deuteron charge radii are, for example, 5-6 standard deviations smaller than the corresponding world averages from regular atoms and electron scattering. I will discuss the so-called "proton radius puzzle", report on more measurements in muonic atoms, and the result of a new measurement in regular atomic hydrogen.

Kontakt: Ellen Lugert, lugert@uni-mainz.de
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