<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mo>(</mml:mo><mml:mi>γ</mml:mi><mml:mo>,</mml:mo><mml:mi>n</mml:mi><mml:mo>)</mml:mo></mml:math>study of the isovector quadrupole resonance in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>40</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>Ca

Sims, D. A.; O'Keefe, GJ; Rassool, RP; Kuzin, A.; Thompson, M.N.; Adler, J.-O.; Andersson, Bo; Fissum, Kevin; Hansen, Kurt Schaldemose; Isaksson, L.; Nilsson, Bengt‐Olof; Ruijter, H.; Sandell, A.; Schrøder, B.; Annand, J. R. M.; Crawford, G.I.; Harty, P.D.; McGeorge, J. C.; Miller, G.J.

doi:10.1103/physrevc.55.1288

Cited by 11 publications

(9 citation statements)

References 21 publications

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“…The collective energies of both functionals are in global agreement with the experiments except for one very light nucleus. Regarding the width, the situation is slightly different The experimental data are taken from [16,39].…”

Section: B Gqr: Mean Energy and Widthmentioning

confidence: 99%

Systematics of isovector and isoscalar giant quadrupole resonances in normal and superfluid spherical nuclei

Scamps

Lacroix

2013

Phys. Rev. C

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The isoscalar (IS) and isovector (IV) quadrupole responses of nuclei are systematically investigated using the time-dependent Skyrme Energy Density Functional including pairing in the BCS approximation. Using two different Skyrme functionals, Sly4 and SkM*, respectively 263 and 304 nuclei have been found to be spherical along the nuclear charts. The time-dependent evolution of these nuclei has been systematically performed giving access to their quadrupole responses. It is shown that the mean-energy of the collective high energy state globally reproduces the experimental IS and IV collective energy but fails to reproduce their lifetimes. It is found that the mean collective energy depends rather significantly on the functional used in the mean-field channel. Pairing by competing with parity effects can slightly affect the collective response around magic numbers and induces a reduction of the collective energy compared to the average trend. Low-lying states, that can only be considered if pairing is included, are investigated. While the approach provides a fair estimate of the low lying state energy, it strongly underestimates the transition rate B(E2). Finally, the possibility to access to the density dependence of the symmetry energy through parallel measurements of both the IS-and IV-GQR is discussed.

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Section: B Gqr: Mean Energy and Widthmentioning

confidence: 99%

Systematics of isovector and isoscalar giant quadrupole resonances in normal and superfluid spherical nuclei

Scamps

Lacroix

2013

Phys. Rev. C

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“…The only remaining precaution is concerned with the isovector giant-quadrupole resonance (IVGQR) which also has an effect on the angular distribution of the differential cross section. After taking the IVGQR into account using experimental photoabsorption data [212,214], the uncertainty of the strength and location of the IVGQR leads to modifications of the angular distribution, being essentially smaller than the differences between the lower (dashed) curves and the (solid) curves in the middle and, thus, is irrelevant for our conclusion that there is no noticeable modification of the in-medium electromagnetic polarizabilities compared to the free ones. Indeed, there is apparent preference of the experimental data for the solid curves i.e.…”

Section: O (Lower Figure) Partitioned Into Components Having Lorentzimentioning

confidence: 99%

“…Data on the isovector quadrupole resonance of 40 Ca have been obtained via the photo-neutron reaction (γ, n) and the (n, γ) neutron capture reaction [214]. Data analysis in terms of models estimate the isovector quadrupole resonance to be at an energy of 31.0 MeV with a width of 16.0 MeV, and exhausting most of the energy weighted IVGQR sum rule.…”

Section: The Isovector Giant-quadrupole Resonance and Higher Multipolesmentioning

confidence: 99%

Compton scattering by nuclei

et al. 2000

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The concept of Compton scattering by even-even nuclei from giant-resonance to nucleon-resonance energies and the status of experimental and theoretical researches in this field are outlined. The description of Compton scattering by nuclei starts from different complementary approaches, namely from second-order S-matrix and from dispersion theories. Making use of these, it is possible to incorporate into the predicted nuclear scattering amplitudes all the information available from other channels, viz. photon-nucleon and photon-meson channels, and to efficiently make use of models of the nucleon, the nucleus and the nucleon-nucleon interaction. The total photoabsorption cross section constrains the nuclear scattering amplitude in the forward direction. The specific information obtained from Compton scattering therefore stems from the angular dependence of the nuclear scattering amplitude, providing detailed insight into the dynamics of the nuclear and nucleon degrees of freedom and into the interplay between them. Nuclear Compton scattering in the giant-resonance energy-region provides information on the dynamical properties of the in-medium mass of the nucleon. Most prominently, the electromagnetic polarizabilities of the nucleon in the nuclear medium can be extracted from nuclear Compton scattering data obtained in the quasideuteron energy-region. In our description of this latter process special emphasis is laid upon the exploration of many-body and two-body effects entering into the nuclear dynamics. Recent results are presented for two-body effects due to the mesonic seagull amplitude and due to the excitation of nucleon internal degrees of freedom accompanied by meson exchanges. Due to these studies the inmedium electromagnetic polarizabilities are by now well understood, whereas the understanding of nuclear Compton scattering in the ∆-resonance range is only at the beginning. Furthermore, phenomenological methods how to include retardation effects in the scattering amplitude are discussed and compared with model predictions.

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“…The differences of the strength of the IVGQR [31,32] discussed above and the different choices for F 2 (q) lead to modifications of the curves smaller than the difference between curves (i, short dashes) and (ii, solid curves) and, thus, are irrelevant for our conclusion that in-medium modifications as large as ∆α = −8 and ∆β = +8 [8], corresponding to the upper curve (iii, long dashes) are ruled out by our data. The same conclusion may be drawn from Fig.…”

Section: Camentioning

confidence: 99%

“…For the prediction of the angular distribution of R(E, θ) also the strength and location of the isovector quadrupole resonance (IVGQR) has to be known (see Table 2). There are two investigations of the IVGQR using the (n,γ) [31] and (γ,n) [32] reactions, leading to E2 strengths centred around E • = 32 MeV and 31 MeV, respectively. We have calculated differential cross sections assuming a strength of one IVGQR energy-weighted sum rule.…”

Section: Camentioning

confidence: 99%