Search for signatures of the supersymmetry in 193Pt and mixed-symmetric states in 194Pt by means of γ spectroscopy

After the general renovation of the experimental halls at the Institute for Nuclear Physics in Cologne, the HORUS-Spectrometer was rebuilt within the scope of this thesis. Following this, two experiments were performed to conduct a γγ-angular correlation analysis. The nuclei 194Pt and 193Pt were measured to complete existing data and the results are presented in this thesis. Both nuclei were measured in β-decay experiments. The mother nuclei were produced in fusion evaporation reactions. In case of 194Pt 10 spins were determined experimentally for the first time. 57 multipole mixing ratios were determined. For the nucleus 193Pt three spins were measured for the first time. After the general renovation a new data acquisition system was set up for experimental measurements. During the measurement of 194Pt two data acquisitions were used, the ''old'' analog data acquistion and the ''new'' digital data acquisition. A short comparison of those two data acquistion systems for nuclear-physical measurements are shown in this thesis. The aim is to measure permanently with the new digital data acquistion. In the region of the gold and platin isotopes there exist even-even nuclei, which can be described via the Interacting-Boson-Model (IBM) and Interacting-Boson-Model-2 (IBM-2). Odd-A nuclei can be illustrated with the Interacting-Boson-Fermion-Model (IBFM). An application of the IBFM is the Uν(6/12) x Uπ(6/4) supersymmetry, consisting of the nuclei that are described by the same Hamiltonian and one set of parameters. To test predictions of 194Pt and 193Pt, multipole-mixing-ratios of γ-transitions and spins were determined. The IBM describes the complex structure of a nucleus in a very simplified way. Very good fits of 194Pt and 193Pt in the O(6)-Limits of the IBM could be made. In addition fits of the even-even platin isotopes are shown to discuss the systematics of the platin isotopes.