Fine structure in the energy region of the isoscalar giant quadrupole resonance: characteristic scales from a wavelet analysis |
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Authors: | Shevchenko A Carter J Fearick R W Förtsch S V Fujita H Fujita Y Kalmykov Y Lacroix D Lawrie J J von Neumann-Cosel P Neveling R Ponomarev V Yu Richter A Sideras-Haddad E Smit F D Wambach J |
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Affiliation: | Institut für Kernphysik, Technische Universit?t Darmstadt, D-64289 Darmstadt, Germany. |
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Abstract: | Fine structure in the energy region of the isoscalar giant quadrupole resonance in nuclei is observed in high-resolution proton scattering experiments at iThemba LABS over a wide mass range. A novel method based on wavelet transforms is introduced for the extraction of scales characterizing the fine structure. A comparison with microscopic model calculations including two-particle two-hole (2p2h) degrees of freedom identifies the coupling to surface vibrations as the main source of the observed scales. A generic pattern is also found for the stochastic coupling to the background of the more complex states. |
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