Identification of characteristic energy scales in nuclear isoscalar giant quadrupole resonances: Fourier transforms and wavelet analysis

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dc.contributor.author Usman, Iyabo Tinuola
dc.date.accessioned 2008-08-08T08:37:33Z
dc.date.available 2008-08-08T08:37:33Z
dc.date.issued 2008-08-08T08:37:33Z
dc.identifier.uri http://hdl.handle.net/10539/5302
dc.description.abstract The identification of energy scales in the region of Isoscalar Giant Quadrupole Resonance (ISGQR) is motivated by their potential use in understanding how an ordered collective motion transforms into a disordered motion of intrinsic single-particle degrees-of-freedom in many-body quantum systems. High energy-resolution measurements of the ISGQR were obtained by proton inelastic scattering at Ep= 200 MeV using the K600 magnetic Spectrometer at iThemba LABS. The nuclei 58Ni, 90Zr, 120Sn and 208Pb, associated with closed shells, were investigated. Both the Fourier transform and Wavelet analysis were used to extract characteristic energy scales and were later compared with the results from the theoretical microscopic Quasi-particle Phonon Model (QPM), including contributions from collective and non-collective states. The scales found in the experimental data were in good agreement with the QPM. This provides a strong argument that the observed energy scales result from the decay of the collective modes into 2p-2h states. The different scale regions were tested directly by reconstruction of measured energy spectra using the Inverse Fourier Transform and the Continuous Wavelet Transform (CWT), together with a comparison to a previously available reconstruction using the Discrete Wavelet Transform (DWT). en
dc.format.extent 1517163 bytes
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dc.format.mimetype application/pdf
dc.format.mimetype application/pdf
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dc.language.iso en en
dc.subject Giant Quadrupole Resonance en
dc.subject Fourier transform en
dc.subject Wavelet analysis en
dc.subject 120Sn en
dc.subject 208Pb en
dc.subject 90Zr en
dc.subject 58Ni en
dc.subject Wavelet reconstruction en
dc.subject Inverse Fourier Transform en
dc.title Identification of characteristic energy scales in nuclear isoscalar giant quadrupole resonances: Fourier transforms and wavelet analysis en
dc.type Thesis en


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