a-particle scattering from Ni isotopes at Eα = 172.5 MeV

Albinski, J.; Budzanowski, A.; Dabrowski, H.; Rogalska, Z.; Wiktor, S.; Rebel, H.; Srivastava, D. K.; Alderliesten, C.; Bojowald, J.; Oelert, W.; Mayer‐Böricke, C.; Turek, P.

doi:10.1016/0375-9474(85)90453-1

Cited by 45 publications

(16 citation statements)

References 23 publications

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“…In the [20 MeV,22 MeV] slice, the L = 0 multipolarity dominates, confirming the nature of the resonance observed at 21.1 MeV in the fitting method. In Fig.…”

Section: Mdasupporting

confidence: 74%

“…The code Fresco [20] was used to calculate the angular distributions with diagonal and transition potentials calculated using the code Dfpot [21]. For the 68 Ni(α,α') 68 Ni * reaction the potentials were generated using the single-folding model and a Gaussian nucleonalpha interaction with parameters determined from fitting the 64 Ni(α,α) elastic scattering data at 43A MeV [22] with a similar procedure. For the 68 Ni(d,d') 68 Ni * reaction the potentials were determined microscopically within the double-folding model using the M3Y effective nucleon-nucleon interaction and a deuteron density calculated with the Hulthén wave function [23].…”

Section: A Experimental Setupmentioning

confidence: 99%

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Isoscalar response ofNi68toα-particle and deuteron probes

et al. 2015

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“…In the [20 MeV,22 MeV] slice, the L = 0 multipolarity dominates, confirming the nature of the resonance observed at 21.1 MeV in the fitting method. In Fig.…”

Section: Mdasupporting

confidence: 74%

Section: A Experimental Setupmentioning

confidence: 99%

Isoscalar response ofNi68toα-particle and deuteron probes

et al. 2015

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“…Real and imaginary diagonal and transition potentials were determined semimicroscopically with the code DFPOT [30] using the single-folding model and calculated 68 Ni densities and a Gaussian alpha-nucleon interaction. The parameters of the alpha-nucleon interaction were obtained by fitting the 64 Niðα; αÞ elastic scattering data at 43A MeV [31]. Transition densities for 68 Ni were calculated with microscopic random-phase approximation (RPA) [32], they were obtained self consistently from the same Skyrme functional as in the Hartree-Fock calculation, namely the SkI2 (K ∞ ¼ 241 MeV) [33] interaction.…”

Section: -2mentioning

confidence: 99%

Measurement of the Isoscalar Monopole Response in the Neutron-Rich NucleusNi68

Vandebrouck¹,

Gibelin²,

Khan³

et al. 2014

Phys. Rev. Lett.

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The isoscalar monopole response has been measured in the unstable nucleus 68 Ni using inelastic alpha scattering at 50A MeV in inverse kinematics with the active target MAYA at GANIL. The isoscalar giant monopole resonance (ISGMR) centroid was determined to be 21.1 AE 1.9 MeV and indications for a soft monopole mode are provided for the first time at 12.9 AE 1.0 MeV. Analysis of the corresponding angular distributions using distorted-wave-born approximation with random-phase approximation transition densities indicates that the L ¼ 0 multipolarity dominates the cross section for the ISGMR and significantly contributes to the low-energy mode. The L ¼ 0 part of this low-energy mode, the soft monopole mode, is dominated by neutron excitations. This demonstrates the relevance of inelastic alpha scattering in inverse kinematics in order to probe both the ISGMR and isoscalar soft modes in neutron-rich nuclei. Measurements in exotic nuclei have yielded an abundance of new information in recent years. For instance, a more general view on magicity has emerged in the past decade [1]. It has also been suggested that measurements of giant resonances in exotic nuclei could help clarify another important problem related to nuclear incompressibility [2]: despite significant progress in our understanding of the nuclear incompressibility, one cannot converge towards a value that is more accurate than the 10%-20% level. In other words, it seems difficult to single out an energy density functional that can give a comprehensive description of the ISGMR, especially in keeping with new data on isotopic chains including open-shell systems and on neutron-rich nuclei [3][4][5][6]. This can be seen in the recent theoretical works on the subject [7][8][9][10][11][12]. The measurement of the ISGMR in exotic neutron-rich nuclei is, therefore, of paramount importance. Such measurements in exotic nuclei would significantly improve our understanding of nuclear incompressibility as was the case for nuclear magicity in the past decade. In addition, a soft monopole mode has been predicted around 14 MeV in neutron-rich nuclei by several relativistic and nonrelativistic models [13][14][15], but it has never been observed, due to the difficulty in measuring the monopole response in nuclei far from stability. The soft monopole mode is predicted to be noncollective and its observation could bring valuable information on spin-orbit splitting [16]. It is therefore essential to measure the isoscalar (in-phase motion of protons and neutrons) monopole response in neutron-rich nuclei.The measurement of giant resonances in unstable nuclei is a particularly challenging task and has, until now, been mainly limited to the isovector (protons and neutrons out of phase) giant dipole resonance in neutron-rich radioactive O, Ne, Sn isotopes, and in 68 Ni [17]. Such measurements provided the first evidence for soft isovector dipole modes in unstable nuclei. These modes are often reanalyzed, showing a nontrivial pattern, departing from the simple pygmy resonance pictu...

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“…Figure 1 shows dσ/dΩ as a function of transfer momentum q for 4 He+ 58 Ni scattering in E in /A P = 20-175 MeV. For lower incident energies of E in /A P = 20-60 MeV, the DF-FDA model (dotted line) overestimates the experimental data [39][40][41][42], but this problem is solved by the DF-TDA model (solid line) that well reproduces the data. For higher energies around E in /A P = 175 MeV, meanwhile, the DF-FDA model underestimates the experimental data [43], but this problem is also solved by the DF-TDA model that reproduces the data.…”

Section: The Naf Modelmentioning

confidence: 98%

Microscopic optical potentials forHe4scattering

et al. 2014

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We present a reliable double-folding (DF) model for 4 He-nucleus scattering, using the Melbourne g-matrix nucleon-nucleon interaction that explains nucleon-nucleus scattering with no adjustable parameter. In the DF model, only the target density is taken as the local density in the Melbourne g-matrix. For 4 He elastic scattering from 58 Ni and 208 Pb targets in a wide range of incident energies from 20 MeV/nucleon to 200 MeV/nucleon, the DF model with the target-density approximation (TDA) yields much better agreement with the experimental data than the usual DF model with the frozen-density approximation in which the sum of projectile and target densities is taken as the local density. We also discuss the relation between the DF model with the TDA and the conventional folding model in which the nucleon-nucleus potential is folded with the 4 He density.

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a-particle scattering from Ni isotopes at Eα = 172.5 MeV

Cited by 45 publications

References 23 publications

Isoscalar response ofNi68toα-particle and deuteron probes

Isoscalar response ofNi68toα-particle and deuteron probes

Measurement of the Isoscalar Monopole Response in the Neutron-Rich NucleusNi68

Microscopic optical potentials forHe4scattering

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