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Tuesday, 19. Nov. 2013 |
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13:15 – 14:20 |
Abstract
Exotic
atoms, i.e. atoms where the electron is replaced by another negatively charged
particle, are exciting laboratories for studying either the properties of the
exotic particle by precision atomic physics techniques, or the interaction of
the exotic particle with the nucleons. In this talk I will present two recent
examples for both cases.
Laser and
microwave spectroscopy of antiprotonic helium yields
the most precise value for the antiproton mass and charge and until short time
ago also the magnetic moment of the antiproton. The spectroscopy of antihydrogen, the simplest atom consisting purely of
antimatter, has the potential of providing the most stringent tests of CPT
symmetry in the hadron sector. Progress and plans of
the ASACUSA collaboration at the Antiproton Decelerator of CERN will be
reviewed.
Light kaonic atoms provide a unique tool to study the kaon-nucelon interaction close to threshold. X-ray
measurements of kaonic hydrogen, 4He and 3He by the
SIDDHARTA collaboration at DAFNE at Laboratori Nationali di Frascati
have provided important data to constrain the strong interaction with
strangeness at low energies. A planned experiment on kaonic
deuterium would complete the experimental data allowing to
extract isospin-dependent scattering lengths.