Analýza fotonových dat pocházejících z neutronového záchytu na jádře 170Tm

Špringlová, Kamila

The subject of this thesis is to study modes of γ decay of 170 Tm; knowledge of quan- tities describing γ decay form an important step in understanding an atomic nucleus. A description of γ decay of excited states of a heavy atomic nucleus above excitation energy of a few MeV is usually performed within the statistical model using the level density and photon strength functions. There have been numerous attempts to introduce models for these quantities, however, there are still contradictions with experimental data. This thesis focuses on analyzing experimental data from γ decay of excited 170 Tm nucleus formed by a slow neutron capture on 169 Tm. Specifically, the so-called sum-energy and multistep γ cascade spectra were prepared and the impact of several parameters used in the data processing was tested. The γ rays emitted from the radiative neutron capture were detected with a highly-segmented high-efficiency scintillation detector DANCE at Los Alamos National Laboratory. The full analysis is then completed by comparing the experimental data with predictions based on various level density and photon strength functions models. The whole process is very complex and its first step is a conversion of raw data to the form that can be compared with simulations, which is the subject of this thesis. 1

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