---
abstract: 'We performed fluctuation analysis by means of the local scaling dimension for the strength function of the isoscalar (IS) giant quadrupole resonance (GQR) in $^{208}$Pb where the strength function is obtained by the shell model calculation including 1p1h and 2p2h configurations. It is found that at almost all energy scales, fluctuation of the strength function obeys the Gaussian orthogonal ensemble (GOE) random matrix theory limit. This is contrasted with the results for the GQR in $^{40}$Ca, where at the intermediate energy scale about 1.7 MeV a deviation from the GOE limit was detected. It is found that the physical origin for this different behavior of the local scaling dimension is ascribed to the difference in the properties of the damping process.'
author:
- Hirokazu Aiba
- Masayuki Matsuo
- Shigeru Nishizaki
- Toru Suzuki
title: 'Fluctuation properties of strength function associated with the giant quadrupole resonance in $^{208}$Pb'
---

Introduction {#sec:intro}
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Giant resonances, excited by various probes, show, at an initial stage of the excitation process, a regular motion with a definite vibrational frequency [@speth; @harakeh]. These regular motions are then damped due to the coupling with a huge number of background states, and finally the so 