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Harakeh, Mohsen; Morsch, H. P.; Vanderweg, K; Vanderwoude, A; Bertrand, F.

doi:10.1103/physrevc.21.768

Cited by 17 publications

(46 citation statements)

References 16 publications

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“…Anharmonicities are a well-established phenomenon in nuclei, both experimentally and theoretically. 3,[6][7][8][9][10][11] In metallic clusters no experimental evidence has been found until now for the existence of states corresponding to the double excitation of the dipole plasmon. Theoretically such states have been predicted at energies deviating by about 10% from the double of the plasmon energy.…”

Section: Introductionmentioning

confidence: 99%

Second random phase approximation studies in metallic clusters

Gambacurta

Catara

2009

Phys. Rev. B

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We study collective states in metallic clusters within the second random phase approximation ͑RPA͒ including all kinds of couplings among all one particle-one hole and two particle-two hole configurations. The calculations are done in the jellium approximation. The coupling of one particle-one hole configurations with the two particle-two hole ones strongly pushes down the multipole strength distribution, especially for the dipole case, with respect to RPA. The inclusion of the coupling of the two particle-two hole configurations among themselves enhances this behavior also for the collective states whose description within RPA is widely accepted as satisfactory. Some possible origins of these unpleasant results are discussed. In particular, the need for a better treatment of short-range correlations is underlined.A mnij,pqkl = ͗HF͉͓a i † a j † a n a m ,͑H,a p † a q † a l a k ͔͉͒HF͘, ͑12͒B mnij,pqkl = − ͗HF͉͓a i † a j † a n a m ,͑H,a k † a l † a q a p ͔͉͒HF͘. ͑15͒Therefore, in SRPA, the QBA is still used. As a consequence of the use of the ͉HF͘ state in the evaluation of the SRPA matrices we obtain, in particular, 14,15

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Section: Introductionmentioning

confidence: 99%

Second random phase approximation studies in metallic clusters

Gambacurta

Catara

2009

Phys. Rev. B

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“…This is confirmed by the distribution of E0 strength calculated in the spherical limit. Note, that the energy E ∼ 24 MeV gives E ISGMR = 69A −1/3 MeV which is closer to the empirical estimation for ISGQR (E ISGQR = 64A −1/3 MeV) rather than for ISGMR (E ISGMR = 78A −1/3 MeV) [2]. The latter gives for ISGMR in 24 Mg the energy E ISGMR ∼27 MeV.…”

Section: Resultsmentioning

confidence: 52%

“…In deformed nuclei, ISGMR is coupled with the K π = 0 + branch of the isoscalar giant quadrupole resonance (IS-GQR), which leads to a double-bump structure (splitting) of the ISGMR [2]. The energy interval between the bumps is larger than the ISGMR and ISGQR widths [2].…”

Section: Introductionmentioning

confidence: 99%

“…The isoscalar giant monopole resonance (ISGMR) represents the main source of information on the nuclear incompressibility [1] and is a subject of intense studies during last decades, see the book [2] and recent reviews [3,4]. In deformed nuclei, ISGMR is coupled with the K π = 0 + branch of the isoscalar giant quadrupole resonance (IS-GQR), which leads to a double-bump structure (splitting) of the ISGMR [2].…”

Section: Introductionmentioning

confidence: 99%

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Deformation-induced splitting of the monopole giant resonance in²⁴Mg

Kvasil

Nesterenko

Repko

et al. 2016

EPJ Web of Conferences

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Abstract. The strong deformation splitting of the isoscalar giant monopole resonance (ISGMR), recently observed in (α, α ) reaction in prolate 24 Mg, is analyzed in the framework of the Skyrme quasiparticle randomphase-approximation (QRPA) approach with the Skyrme forces SkM*, SVbas and SkP δ . The calculations with these forces give close results and confirm that the low-energy E0-peak is caused by the deformation-induced coupling of ISGMR with the K = 0 branch of the isoscalar giant quadrupole resonance.

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“…Albeit being the best studied case experimentally and theoretically, many open questions remain in our under-standing of the IVGDR [36]. In particular, the observed resonance widths as a function of mass number show strong fluctuations which have never been fully explained on a microscopic basis [37].…”

Section: Introductionmentioning

confidence: 99%

Studies of the Giant Dipole Resonance in $^{27}$Al, $^{40}$Ca, $^{56}$Fe, $^{58}$Ni and $^{208}$Pb with high energy-resolution inelastic proton scattering under 0$^\circ$

Jingo,

Buthelezi,

Carter

et al. 2018

Preprint

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A survey of the fine structure of the Isovector Giant Dipole Resonance (IVGDR) was performed, using the recently commissioned Zero-degree Facility of the K600 magnetic spectrometer at iThemba LABS. Inelastic proton scattering at an incident energy of 200 MeV was measured on 27 Al, 40 Ca, 56 Fe, 58 Ni and 208 Pb. A high energy-resolution (∆E 40 keV FWHM) could be achieved after utilising faint-beam and dispersion-matching techniques. Considerable fine structure is observed in the energy region of the IVGDR and characteristic energy scales are extracted from the experimental data by means of a wavelet analysis. The comparison with Quasiparticle-Phonon Model (QPM) calculations provides insight into the relevance of different giant resonance decay mechanisms. Photoabsorption cross sections derived from the data assuming dominance of relativistic Coulomb excitation are in fair agreement with previous work using real photons.

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Isoscalar giant resonances inTh232

Cited by 17 publications

References 16 publications

Second random phase approximation studies in metallic clusters

Second random phase approximation studies in metallic clusters

Deformation-induced splitting of the monopole giant resonance in²⁴Mg

Studies of the Giant Dipole Resonance in $^{27}$Al, $^{40}$Ca, $^{56}$Fe, $^{58}$Ni and $^{208}$Pb with high energy-resolution inelastic proton scattering under 0$^\circ$

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Isoscalar giant resonances inTh232

Cited by 17 publications

References 16 publications

Second random phase approximation studies in metallic clusters

Second random phase approximation studies in metallic clusters

Deformation-induced splitting of the monopole giant resonance in24Mg

Studies of the Giant Dipole Resonance in $^{27}$Al, $^{40}$Ca, $^{56}$Fe, $^{58}$Ni and $^{208}$Pb with high energy-resolution inelastic proton scattering under 0$^\circ$

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Deformation-induced splitting of the monopole giant resonance in²⁴Mg