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

Usman, Iyabo Tinuola

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

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.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
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dc.format.mimetype	application/pdf
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dc.identifier.uri	http://hdl.handle.net/10539/5302
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