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Nuclear isomers. --- Isomerism (Nuclear physics) --- Isomers, Nuclear --- Isomers (Nuclear physics) --- Nuclear physics --- Nuclides --- Research. --- Nuclear research
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This work focuses on new electromagnetic decay mode in nuclear physics. The first part of the thesis presents the observation of the two-photon decay for a transition where the one-photon decay is allowed. In the second part, so called quadrupole mixed-symmetry is investigated in inelastic proton scattering experiments. In 1930 Nobel-prize winner M. Goeppert-Mayer was the first to discuss the two-photon decay of an exited state in her doctoral thesis. This process has been observed many times in atomic physics. However in nuclear physics data is sparse. Here this decay mode has only been observed for the special case of a transition between nuclear states with spin and parity quantum number 0+. For such a transition, the one-photon decay – the main experimental obstacle to observe the two-photon decay – is forbidden. Furthermore, the energy sharing and angular distributions were measured, allowing conclusions to be drawn about the multipoles contributing to the two-photon transition. Quadrupole mixed-symmetry states are an excitation mode in spherical nuclei which are sensitive to the strength of the quadrupole residual interaction. A new signature for these interesting states is presented which allows identification of mixed-symmetry states independently of electromagnetic transition strengths. Furthermore this signature represents a valuable additional observable to test model predictions for mixed-symmetry states.
Nuclear Physics --- Electricity & Magnetism --- Physics --- Physical Sciences & Mathematics --- Photons --- Radioactive decay. --- Nuclear isomers. --- Scattering. --- Isomerism (Nuclear physics) --- Isomers, Nuclear --- Isomers (Nuclear physics) --- Decay, Radioactive --- Radioactive disintegration --- Nuclear physics --- Nuclides --- Half-life (Nuclear physics) --- Nuclear reactions --- Radioactivity --- Scattering (Physics) --- Nuclear physics. --- Nuclear Physics, Heavy Ions, Hadrons. --- Theoretical, Mathematical and Computational Physics. --- Atomic nuclei --- Atoms, Nuclei of --- Nucleus of the atom --- Heavy ions. --- Mathematical physics. --- Physical mathematics --- Ions --- Mathematics
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This thesis describes the first detection of a nuclear transition that had been sought for 40 years, and marks the essential first step toward developing nuclear clocks. Atomic clocks are currently the most reliable timekeepers. Still, they could potentially be outperformed by nuclear clocks, based on a nuclear transition instead of the atomic transitions employed to date. An elusive, extraordinary state in thorium-229 seems to be the only nuclear transition suitable for this purpose and feasible using currently available technology. Despite repeated efforts over the past 40 years, until recently we had not yet successfully detected the decay of this elusive state. Addressing this gap, the thesis lays the foundation for the development of a new, better frequency standard, which will likely have numerous applications in satellite navigation and rapid data transfer. Further, it makes it possible to improve the constraints for time variations of fundamental constants and opens up the field of nuclear coherent control.
Nuclear physics. --- Atomic clocks. --- Nuclear isomers. --- Physics. --- Heavy ions. --- Hadrons. --- Physical measurements. --- Measurement. --- Nuclear Physics, Heavy Ions, Hadrons. --- Measurement Science and Instrumentation. --- Atomic nuclei --- Atoms, Nuclei of --- Nucleus of the atom --- Physics --- Isomerism (Nuclear physics) --- Isomers, Nuclear --- Isomers (Nuclear physics) --- Nuclear physics --- Nuclides --- Clocks, Atomic --- Atomic frequency standards --- Clocks and watches --- Frequency standards --- Measurement . --- Measuring --- Mensuration --- Mathematics --- Technology --- Metrology --- Physical measurements --- Measurements, Physical --- Mathematical physics --- Measurement --- Ions
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