Multipole Assignment of the 8.9-MeV Resonance in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Pb</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>208</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>

Schwierczinski, A.; Frey, R.; Richter, A.; Spamer, E.; Theissen, H.; Titze, O.; Walcher, Th.; Krewald, S.; Rosenfelder, R.

doi:10.1103/physrevlett.35.1244

Cited by 39 publications

(9 citation statements)

References 14 publications

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“…Proton and electron scattering experiments, which may reach resolutions better than 50 keV, present promising candidates for this type of analysis. The appearance of fine structure in the isoscalar giant quadrupole resonance (ISGQR) of 208 Pb has been reported already a long time ago in high-resolution electron scattering [9,10]. This finding, which has led to considerable debate, was finally confirmed [11] when proton scattering data of comparable resolution became available [12].…”

Section: Introductionmentioning

confidence: 86%

Multiple scales in the fine structure of the isoscalar giant quadrupole resonance in 208Pb

Lacroix¹,

Mai

Neumann-Cosel

et al. 2000

Physics Letters B

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The fine structure of the isoscalar giant quadrupole resonance in 208 Pb, observed in high-resolution (p,p ′ ) and (e,e ′ ) experiments, is studied using the entropy index method. In a novel way, it enables to determine the number of scales present in the spectra and their magnitude. We find intermediate scales of fluctuations around 1.1 MeV, 460 keV and 125 keV for an excitation energy region 0−12 MeV. A comparison with scales extracted from second RPA calculations, which are in good agreement with experiment, shows that they arise from the internal mixing of collective motion with two particle-two hole components of the nuclear wavefunction.

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Section: Introductionmentioning

confidence: 86%

Multiple scales in the fine structure of the isoscalar giant quadrupole resonance in 208Pb

Lacroix¹,

Mai

Neumann-Cosel

et al. 2000

Physics Letters B

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“…We are not interested here in the distribution of the fine structure peaks but focus our attention solely on the gross features of the E2 strength distribution between Ex ~8-11.5 MeV. Note that the raw spectrum exhibits already a concentration of strength in regions of the spectrum around E~8.9, 10.2, 10.6, 11.2 MeV [1,5]. Despite the fact that the inelastic cross section accounts for only 5% of the observed counting rate we will demonstrate below how this formidable difficulty can be successfully surmounted with the help of the techniques described in Sect.…”

Section: Experimental Details Raw Spectra and First Order Backgroundmentioning

confidence: 99%

“…An even more pronounced fine structure is seen in singlearm inelastic electron scattering spectra on 2~ in particular at high resolution (AE1/2 = 35-50 keV), in the region of the GQR [1,5]. So, the first problem is evidently that the high resolution (p, p') experiments show no fine structure in the GQR region in 2~ contrary to high resolution (e, e') experiments, both types of experiment being performed at comparable energy resolution.…”

Section: Introductionmentioning

confidence: 99%

Isoscalar quadrupole giant resonance in208Pb: A statistical analysis of high-resolution inelastic electron scattering spectra

Kilgus

Kühner

Müller

et al. 1987

Z. Physik A - Atomic Nuclei

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Dedicated to Professor Friedrich Beck on the occasion of his 60th birthdayThe fine structure observed in high resolution inelastic electron scattering spectra for 2~ in the excitation energy range of the isoscalar giant quadrupole resonance has been analysed with a fluctuation analysis technique. The obtained density of levels as a function of excitation energy Ex has then been used as a constraint for the shape and magnitude of the (radiative) background subtracted spectra subjected to a multipole decomposition. The derived E2 strength in the region 8.07)% of the energy weighted sum rule. The E2 strength found is considerably \ ] larger than previously estimated from the same spectra and it is now both in shape and magnitude in good agreement with results from a recent 2~ e'n) coincidence experiment.

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“…Already about 30 years ago it became apparent from highenergy-resolution inelastic electron-scattering experiments [3,4] that there was considerable fine structure superimposed on the broad bump of the isoscalar giant quadrupole resonance (ISGQR) in 208 Pb. Further studies [5] have shown that such fine structure is physical in nature and also appears in other reaction channels.…”

Section: Introductionmentioning

confidence: 99%

“…[3,4] in terms of a doorway-state model [11]. It could be shown that in this case the spreading width dominates over the escape width but the deduced scales depended strongly on the assumptions about the (unknown) number of doorway states.…”

Section: Introductionmentioning

confidence: 99%

Analysis of fine structure in the nuclear continuum

et al. 2008

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Fine structure has been shown to be a general phenomenon of nuclear giant resonances of different multipolarities over a wide mass range. In this article we assess various techniques that have been proposed to extract quantitative information from the fine structure in terms of characteristic scales. These include the so-called local scaling dimension, the entropy index method, Fourier analysis, and continuous and discrete wavelet transforms. As an example, results on the isoscalar giant quadrupole resonance in 208 Pb from high-energy-resolution inelastic proton scattering and calculations with the quasiparticle-phonon model are analyzed. Wavelet analysis, both continuous and discrete, of the spectra is shown to be a powerful tool to extract the magnitude and localization of characteristic scales.

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Multipole Assignment of the 8.9-MeV Resonance inPb208

Cited by 39 publications

References 14 publications

Multiple scales in the fine structure of the isoscalar giant quadrupole resonance in 208Pb

Multiple scales in the fine structure of the isoscalar giant quadrupole resonance in 208Pb

Isoscalar quadrupole giant resonance in208Pb: A statistical analysis of high-resolution inelastic electron scattering spectra

Analysis of fine structure in the nuclear continuum

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