Magister Scientiae - MSc (Physics)

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Linear polarization and lifetime measurement in ¹⁹⁴TL
(University of the Western Cape, 2006) Masiteng, Lukisi Paulus; Lawrie, Dr. Elena, A; Roux, Dr. David, G
High-spin states in¹⁹⁴TL were populated using the 181Ta1t8O, 5n) reaction at the beam energies of 91 and 93 MeV during two weekends of beam time. The 1^Tcoincidence data associated with this reaction were measured employing the AFRODITE array, which at that time consisted of 8 clover and 6 Low Energy Photon Spectroscopy (LEPS) detectors at iThemba Laboratory for Accelerator Based Sciences (iThemba LABS). The spectroscopy analysis of the ¹⁹⁴TL data presented in this work involved the following analysis and measurements: gain matching, calibration, gain drift corrections and Doppler-shift corrections for one week-end of data, linear polarization and recoil shadow anisotropy (RSAM) lifetime measurements using all data. The obtained linear polarization anisotropies were used to assign parities to the levels of the existing level scheme of ¹⁹⁴TL [Ram06]. One isomeric state at Io = 8- associated with a delayed 293 keV transition was observed and its half-life was determined by using the RSAM technique to be / 17 = 6.9t1.0ns.