Browsing by Author "Easton, Jayson Lee"

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    Fine structure in the α decay of 179Hg and 177Au
    (Springer, 2025) Easton, Jayson Lee; Lawrie E.A.; Špaček A.
    The α-decay fine structure of 179Hg and 177Au was studied by means of decay spectroscopy. Two experiments were performed at the Accelerator Laboratory of the University of Jyväskylä (JYFL), Finland, utilizing the recoil separator RITU and a digital data acquisition system. The heavy-ion induced fusion-evaporation reactions 3682Kr + 44100Ru and 3888Kr + 4292Mo were used to produce the 179Hg and 177Au nuclei, respectively. Studying the evaporation residues (ER, recoils)-α1-α2 correlations and α-γ coincidences, a new α decay with Eα = 6156(10) keV was observed from 179Hg. This decay populates the (9/2-) excited state at an excitation energy of 131.3(5) keV in 175Pt. The internal conversion coefficient for the 131.3(5) keV transition de-exciting this state was measured for the first time. Regarding the 177Au nucleus, a new α decay with Eα = 5998(9) keV was observed to populate the 156.1(6) keV excited state in 173Ir. Two de-excitation paths were observed from this excited state. Moreover, a new 215.7(13) keV transition was observed to depopulate the 424.4(13) keV excited state in 173Ir. Properties of the 179Hg and 177Au α decays were examined in a framework of reduced widths and hindrance factors. For clarity and simplicity, the spin and parity assignments (e.g. Jπ) are presented without brackets throughout the text.
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    New bands in ¹⁹²Tl using gamma spectroscopy techniques
    (University of the Western Cape, 2011) Easton, Jayson Lee; Lawrie, E.A; Lindsay, R
    High spin excited stats in¹⁹²Tl were studied using gamma-ray spectroscopy. The study included taking an active part in performing the experiment, understanding the experimental procedure, electronics and data acquisition in this experiment. The high spin states in ¹⁹²Tl were produced using a ³⁷Cl beam and ¹⁶⁰Gd target. The nine clovers of the AFRODITE array were placed at 90° and 135°. The target was thin, allowing the residual thallium nuclei to recoil in vacuum. Two weeks of data was acquired and analysed in this work. In addition more data was acquired in order to perform DSAM lifetime measurements, but this is beyond the scope of this work. The preliminary data analysis of the thin target data involved energy and time-gain matching calibrations as well as Doppler shift and gain drift corrections. Then the data were sorted into matrices and spectra for the actual analysis. The known level scheme of ¹⁹²Tl was extended by more than 50 new transitions placed in three new bands. A chiral partner to the yrast band in ¹⁹²92Tl was searched for but not found. But there is still a possibility such a band to be discovered, when the additional three weekends of data (including the DSAM lifetime measurements) undergo such an analysis.