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Präzisionsexperimente - Abteilung Blaum
Abstract:
The dominant fraction of elements heavier than iron was created in stellar nucleosynthesis
by neutron-capture reactions. The isotopic compositions of these
elements are the fingerprints of the involved processes, and a huge amount of
experimental data on these isotopes is required to support corresponding astrophysical
calculations and models.
The TRIGA-SPEC experiment aims to contribute to these data by the measurement
of ground-state properties of neutron-rich heavy nuclides. It consists of the
Penning-trap mass spectrometer TRIGA-TRAP for the determination of masses,
Q-values and binding energies, and the collinear laser spectroscopy setup TRIGALASER
for the determination of charge radii, nuclear spins, and moments. The
nuclides of interest are produced by neutron-induced fission of an actinide target
inside the research reactor TRIGA Mainz and ionized in an online ion source.
In the context of this thesis, the two experiments were coupled to the reactor, completing
the ion beam preparation transfer line. This included the implementation
and commissioning of a radio-frequency quadrupole for the emittance reduction
and accumulation of the ions. The functionality of the ion beam preparation was
verified by successful test measurements of stable nuclides produced in the online
ion source.
