Fine structure of the isoscalar giant quadrupole resonance in 40Ca due to Landau damping?

Usman, I. T.; Buthelezi, Z.; Carter, J.; Cooper, G.R.J.; Fearick, R. W.; Förtsch, S. V.; Fujita, H.; Fujita, Y.; Kalmykov, Y.; Neumann-Cosel, P. von; Neveling, R.; Papakonstantinou, P.; Richter, A.; Roth, Robert; Shevchenko, A.; Sideras‐Haddad, E.; Smit, F. D.

doi:10.1016/j.physletb.2011.03.015

Cited by 27 publications

(39 citation statements)

References 53 publications

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“…We also notice that our theoretical predictions are qualitatively and quantitatively different from those published in Ref. [23] and compared to the high-precision spectrum of 40 Ca. Those theoretical results (both RPA and SRPA) are based on a potential derived from a realistic interaction with the Unitary Correlation Operator Method (UCOM) and provide: (i) a more fragmented (than ours) RPA spectrum; (ii) a strongly overestimated RPA centroid; (iii) a SRPA spectrum strongly shifted downwards with respect to RPA and not corrected from instabilities; (IV) a SRPA spectrum which is much less dense than ours in the strength distribution.…”

Section: Systematic Study For the Is Gqr: Centroid Energies And contrasting

confidence: 99%

“…High-resolution experiments based on proton inelastic scattering have been performed at iThemba LABS to investigate the fine structure of GQR excitations for 40 Ca [23], 58 Ni, 90 Zr, 120 Sn, and 208 Pb [24].…”

Section: Systematic Study For the Is Gqr: Centroid Energies And mentioning

confidence: 99%

“…The importance of such a single-particle finestructure effect in lighter nuclei was already discussed in Refs. [23,30,31]. In particular, the authors of Refs.…”

Section: Systematic Study For the Is Gqr: Centroid Energies And mentioning

confidence: 99%

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Systematic study of giant quadrupole resonances with the subtracted second random-phase approximation: Beyond-mean-field centroids and fragmentation

2018

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A systematic analysis of giant quadrupole resonances is performed for several nuclei, from 30 Si to 208 Pb, within the subtracted second random-phase-approximation (SSRPA) model in the framework of the energy-density-functional theory. Centroid energies and widths of the isoscalar giant quadrupole resonances are compared with the corresponding random-phase-approximation (RPA) values. We find lower SSRPA centroid energies compared to the RPA values leading, in general, to a better agreement with the experimental data. As far as the widths are concerned, we observe for both SSRPA and RPA cases a global attenuation of the single-particle Landau damping going from lighter to heavier nuclei and we obtain, systematically, larger widths in the SSRPA model compared to the RPA case. For some selected nuclei for which high-resolution (p, p ′ ) experimental data are available, namely 40 Ca, 90 Zr, 120 Sn, and 208 Pb, the theoretical strength distributions are directly compared with the experimental spectra. We observe a significant improvement, with respect to RPA results, in the description of the spreading widths and of the fragmentation of the obtained spectra, due to the coupling between 1 particle-1 hole and 2 particle-2 hole configurations.

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Section: Systematic Study For the Is Gqr: Centroid Energies And contrasting

confidence: 99%

Section: Systematic Study For the Is Gqr: Centroid Energies And mentioning

confidence: 99%

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Systematic study of giant quadrupole resonances with the subtracted second random-phase approximation: Beyond-mean-field centroids and fragmentation

2018

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“…ISGQR [8,9,10,11] and the IVGDR [12,13,14,15,16], respectively. Fine structure was observed across the nuclear chart.…”

Section: Experimental Evidence For Fine Structurementioning

confidence: 99%

“…Examples are discussed in Refs. [7,10,13,19]. One can identifiy in all cases the decomposition order i containing the largest scale, i.e.…”

Section: Wavelet Analysismentioning

confidence: 99%

Fine Structure of Giant Resonances: What Can Be Learned

Neumann-Cosel¹

2019

Acta Phys. Pol. B

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Fine structure of giant resonances (GR) has been established in recent years as a global phenomenon across the nuclear chart and for different types of resonances. A quantitative description of the fine structure in terms of characteristic scales derived by wavelet techniques is discussed. By comparison with microscpic calculations of GR strength distributions one can extract information on the role of different decay mechanisms contributing to the width of GRs. The observed cross-section fluctuations contain information on the level density (LD) of states with a given spin and parity defined by the multipolarity of the GR.

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High Energy-Resolution Experiments with the K600 Magnetic Spectrometer at Intermediate Energies

Usman

2013

Exciting Interdisciplinary Physics

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Fine structure of the isoscalar giant quadrupole resonance in 40Ca due to Landau damping?

Cited by 27 publications

References 53 publications

Systematic study of giant quadrupole resonances with the subtracted second random-phase approximation: Beyond-mean-field centroids and fragmentation

Systematic study of giant quadrupole resonances with the subtracted second random-phase approximation: Beyond-mean-field centroids and fragmentation

Fine Structure of Giant Resonances: What Can Be Learned

High Energy-Resolution Experiments with the K600 Magnetic Spectrometer at Intermediate Energies

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