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Precision mass spectrometry

The mass is a relevant quantity in many physical models: masses of exotic short-lived nuclei are important for the investigation of the weak interaction and the Standard Model of particle physics, stable masses are used for the definition of natural constants. → Publications

The tandem Penning trap mass spectrometer ISOLTRAP at the on-line isotope separator ISOLDE at CERN/Geneva plays a leading role in the field of accurate mass measurements of short-lived nuclides.
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With MATS (Precision Measurements of very short-lived nuclei using an Advanced Trapping System for highly-charged ions) at FAIR we aim for applying both techniques to very short-lived radionuclides: high-precision mass measurements and in-trap conversion electron as well as alpha spectroscopy.
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The Penning-trap mass spectrometer PENTATRAP performs mass-ratio measurements on long-lived, highly charged, heavy ions with a precision on the order of δm/m <= 10-11 or better. Unique for PENTATRAP are the synchronously operated five traps, a self-build ultrastable voltage source and access to external ion sources.
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TRIGA-Trap is a double-Penning trap mass spectrometer at the research reactor TRIGA Mainz. Concerning detection techniques, the setup features the commonly applied time-of-flight and phase-imaging ion cyclotron resonance methods as well as the narrow-band FT-ICR technique. Within the TRIGA-Trap project we installed for the very first time a Penning trap at a nuclear research reactor in order to have access to neutron-rich fission products. Moreover, samples of stable nuclides as well as of heavy elements above uranium are available for off-line measurements.
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Precise measurements of the magnetic moment

For the measurement of the g-factor of the electron in extremely heavy ions, a novel cryogenic Penning trap, called ALPHATRAP, is currently set up at MPIK. It features an access to the Heidelberg EBIT, which can deliver even the heaviest highly charged ions up to 208Pb81+. With these systems it becomes possible to probe QED at the boundary of our knowledge in the most extreme fields.
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BASE (Baryon Antibaryon Symmetry Experiment) is a multinational collaboration at the Antiproton Decelerator (AD) facility at CERN, Geneva. The BASE collaboration performs high-precision experiments to compare fundamental properties of protons and antiprotons by determination and comparison of their charge-to-mass ratios and magnetic moments (g factors) in Penning traps.
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Among others μTEx is one of the worldwide leading experiments to investigate nuclear properties using single ions in a Penning trap. At the experiment measurements with a precision of 1 part in a trillion enable the determination of magnetic moments, sizes and weights of single charged atoms. To this end methods such as sympathetic laser cooling, microwave spectroscopy and quantum jump spectroscopy are combined within one of the most stable superconducting magnets.
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High-resolution laser spectroscopy

Our division is involved in the COLLAPS experiment at ISOLDE/CERN in Geneva, which is aimed at the investigation of ground state properties of exotic, short lived nuclei, such as spins, electro-magnetic moments and charge radii by means of collinear laser spectroscopy.
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Molecular quantum dynamics

The electrostatic cryogenic storage ring CSR, developed for atomic, molecular, and cluster physics experiments in a cryogenic environment, started operation successfully in March 2015.
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