Jerzy Pniewski Colloquium
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Laser Spectroscopy of Muonic Atoms
Abstract:
In muonic atoms, the atomic electrons are replaced by a single muon. Due to the large muon mass and correspondingly small Bohr orbit, nuclear structure effects on atomic energy levels are vastly enhanced.
We have performed laser spectroscopy on muonic hydrogen, deuterium, and helium-3 and -4 ions, with surprising 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.
Od godz. 16 zapraszamy uczestników na kawę, ciastka i nieformalne dyskusje przy wejściu do sali 0.03.
Barbara Badełek
Marek Pfützner
Jan Suffczyński
Nobel 2016
Streszczenie:
The 2016 Nobel Prize in Physics was awarded to David J. Thouless, F. Duncan M. Haldane, and J. Michael Kosterlitz "for theoretical discoveries of topological phase transitions and topological phases of matter".
The Nobel Committee does not mention a specific discovery, but rather refers to a collection of groundbreaking results, which lay at the foundation of our current understanding of topological phases in quantum matter.
We aim at presenting a short account of the historical context and a pedagogical explanation of the original results associated with the names of Nobel 2016 Laureates. In our talk we will discuss:
1) phase transitions in two dimensions triggered by vortices,
2) the gapped phase of spin one chains and 3) the topological invariant underlining the physics of the quantum Hall effect.
We believe the intellectual achievements of this year's Laureates are breathtaking for their own sake, even without direct reference to applications. "It's very difficult to know whether something is useful or not, but one can know that it's exciting" -- as summarized by Haldane in the first Nobel interview.
Referat zostanie wygłoszony w ramach wspólnego posiedzenia konwersatoriów im. J. Pniewskiego i L. Infelda.
Zapraszamy!
Jan Kalinowski, Jerzy Kijowski, Czesław Radzewicz, Wojciech Satuła, Janusz Skalski