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キーワード:
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要旨:
The observation of neutrinoless double-electron capture would prove the Majorana
character of neutrinos. Transitions with an energy degeneracy of the initial
and final state show a resonant enhancement of the decay rate and would be important
for neutrino physics experiments. In order to identify such transitions, precise
Q-value measurements with Penning-trap mass spectrometers play a key role. In
this thesis, the resonance condition of neutrinoless double-electron capture in 106Cd,
108Cd, and 184Os was investigated by Q-value measurements with the Penning-trap
mass spectrometer TRIGA-TRAP. In addition, the Q value of the double-beta decay
in 110Pd was measured.
A high-voltage platform and an on-line ion source for the ionization of shortlived
neutron-rich fission products for the TRIGA-SPEC experiment located at the
research reactor TRIGA Mainz has been commissioned and tested. The aim is to
provide a radioactive ion beam for high-precision mass spectrometry and collinear
laser spectroscopy. For the extraction from the TRIGA reactor, the fission products
are attached to aerosol particles and transported with a gas-jet system to the on-line
ion source. This ion source has to cope with a high gas load and has to destroy the
bond between fission product and aerosol particle. It was investigated, whether an
2.45 GHz ECR ion source is suited for this task.
