Angular correlation measurements with a segmented clover detector
| dc.contributor.author | Mthembu, Sinegugu Happiness | |
| dc.date.accessioned | 2019-07-16T12:14:02Z | |
| dc.date.available | 2019-07-16T12:14:02Z | |
| dc.date.issued | 2019 | |
| dc.description | A thesis submitted for the Degree of Master of Science in Physics, in the Department of Physics, Faculty of Science and Agriculture at the University of Zululand, 2019. | en_US |
| dc.description.abstract | Gamma-gamma angular correlation measurements are an important tool to determine (amongst other nuclear properties) the multipolarity and the mul- tipole mixing ratio of a gamma-ray transition. In this work we use for the rst time a segmented clover detector placed at close geometry to measure angular correlation functions. Gamma-gamma angular correlation analysis was carried out for the transitions of 133Ba and 60Co. It allowed to determine the angular correlation coe cients, a2 and a4, and to establish the multipole mixing ratios of several gamma-ray transitions. Codes to sort and analyze gamma-gamma angular correlation data were developed and a technique to deduce the mix- ing ratios was established. It was shown that the iThemba LABS segmented clover detector has an excellent capability for gamma-gamma angular correla- tions measurements, allowing one to determine multipole mixing ratios with high precision. The analysis of the gamma-gamma cascades of 133Ba proved that with this detector one can determine the M1+E2 multipole mixing ratios for gamma-ray transitions with precision similar to that listed in the Nuclear data tables, where the results of many di erent experiments are combined and averaged. Note that our results were produced from 12 hours of data collec- tion for each sources that were used namely 60Co and 133Ba. The analysis of the 1173 �� 1332 keV cascade in 60Co showed that using the segmented clover one can easily distinguish a stretched dipole from an unstretched quadrupole transition. Moreover, new results on the signs of the multipole mixing ratios for some transitions in 133Ba were obtained. In addition to measuring the multipole mixing ratios for the transitions in 60Co and 133Ba, an analysis was performed in order to investigate the possibility of a new 437 keV transition in 133Ba but no evidence supporting such a transition was found. | en_US |
| dc.description.sponsorship | National Research Foundations | en_US |
| dc.identifier.uri | https://hdl.handle.net/10530/1753 | |
| dc.language.iso | en | en_US |
| dc.publisher | University of Zululand | en_US |
| dc.subject | Angular correlation measurements | en_US |
| dc.title | Angular correlation measurements with a segmented clover detector | en_US |
| dc.type | Thesis | en_US |
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