Browsing by Author "Montes, Elias Jose Martin"
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Item Determining the spectroscopic quadrupole moment of the first 2+ state in 36Ar(University of the Western Cape, 2019) Montes, Elias Jose Martin; Orce, NicoA series of reorientation-effect Coulomb-excitation experiments were carried out at iThemba LABS from April to May 2016. Enriched ion beams of Ar, Ar and S were bombarded at safe energies, well below the Coulomb barrier, onto a heavyPt target with thickness 1mg/cm2. The three experiments were performed to determine the spectroscopic or static quadrupole moment 𝑄, of the first excitation 2 in these nuclei in order to shed light on the zip-zap of nuclear shapes found at the end of the sd shell. This thesis will be dealing with the particular case of Ar, accelerated at a safe bombarding energy of 134.2 MeV. For this purpose, a particle-gamma coincidence experiment has been carried out using the AFRODITE array composed of 8 high-purity germanium clover detectors to detect the de-exciting gamma energies, coupled to a double-sided CD-type S3 silicon detector at backward angles composed of 32 sectors and 24 rings to detect the scattering particles. A new optimised sorting code has been developed which included fast computing processing, non-Doppler (194Pt) and Doppler correction (36Ar), add-back, and energysharing, particle and time tagging conditions. The peaks of interests in the spectra were analysed using the Coulombexcitation code GOSIA. Using the normalization method, a more precise determination of 𝑄2 0.093 eb has been accomplished.