Analysis of emission mechanisms in nucleon-induced reactions around the Fermi energy

Sébille, F.; Mota, V. de la; García, Ignacio Cristobal; Lecolley, J.F.; Blidéanu, V.

doi:10.1016/j.nuclphysa.2007.04.024

Cited by 7 publications

(4 citation statements)

References 34 publications

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“…In contrast to the scattering of neutrons, which is taken as isotropic, those between neutron and proton σ np and between protons σ pp are anisotropic in accordance with the fit of Ref. [26], which is given in detail in the Appendix. Similarly to above, the corresponding values of R sim NN on the evolving nuclear density [27],…”

Section: A a Density-dependent N N Cross Sectionmentioning

confidence: 63%

“…The dimensionless weighting factor f (E, θ) is equal to unity for the scattering between neutrons (f nn ≡ 1) and is increasingly anisotropic as energy increases for neutron-proton scattering (the f np case), and especially becomes strongly forward-backward peaked for the scattering between protons (f pp ). The parametrization of the angular dependence of σ np is defined as [26] f (E, θ) np = A 1 cos 4 θ − A 2 cos 3 θ + A 3…”

Section: Appendixmentioning

confidence: 99%

“…5(a). Adopting a very crude estimate, the polar angle dependence of σ pp is defined as [26] f (E, θ) pp =      B 1 exp(B 2 θ), θ < θ 0 , B 3 , θ 0 < θ < π − θ 0 , B 1 exp(B 2 (π − θ)), θ > π − θ 0 ,…”

Section: Appendixmentioning

confidence: 99%

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Aspects of the momentum dependence of the equation of state and of the residualNNcross section, and their effects on nuclear stopping

2016

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With the semiclassical Landau-Vlasov transport model we studied the stopping observable RE, the energy-based isotropy ratio, for the 129 Xe + 120 Sn reaction at beam energies spanning 12A to 100A MeV. We investigated the impacts of the nonlocality of the nuclear mean field, of the inmedium modified nucleon-nucleon (N N ) cross section and of the reaction centrality. A fixed set of model parameters yields RE values that favorably compare with the experimental ones, but only for energies below the Fermi energy EF . Above EF agreement is readily possible, but by a smooth evolution with energy of the parameter that controls the in-medium modification of N N cross section. By comparing the simulation correction factor F applied to the free N N cross section with the one deduced from experimental data [Phys. Rev. C 90, 064602 (2014)], we infer that the zero-range mean field almost entirely reproduces it. Also, in accordance with what has been deduced from experimental data, around EF a strong reduction of the free N N cross section is found. In order to test the impact of sampling central collisions by multiplicity an event generator (HIPSE) was used. We obtain that high multiplicity events are spread over a broad impact parameter range, but it turns out that this has a small effect on the observable RE and, thus, on F as well.

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Section: A a Density-dependent N N Cross Sectionmentioning

confidence: 63%

Section: Appendixmentioning

confidence: 99%

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Aspects of the momentum dependence of the equation of state and of the residualNNcross section, and their effects on nuclear stopping

2016

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“…[4] a preliminary resolution scheme of the ETDHF equation was proposed and different aspects of the description were analyzed. Applications to HIC at intermediate energies [10] and to nucleon induced collisions [11] have been performed. An extension of the model adapted to the description of the outer layers of neutron star crusts has also been developed [12].…”

Section: The Dissipative Behaviormentioning

confidence: 99%

Revisiting an extended-mean-field approach in heavy-ion collisions around the Fermi energy

Besse,

de la Mota,

Bonnet

et al. 2020

Preprint

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Static and dynamical aspects of nuclear systems are described through an extended-time dependent mean-field approach. The foundations of the formalism are presented, with highlights on the estimation of average values and their corresponding dispersions. In contrast to semiclassical transport models the particular interest of this description lies on its intrinsic quantal character. The reliability of this approach is discussed by means of stopping-sensitive observables analysis in heavy ion collisions in the range of 20 to 120 MeV per nucleon.

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Fast-neutron induced pre-equilibrium reactions on 55Mn and 63,65Cu at energies up to 40 MeV

et al. 2008

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Excitation functions were measured for the 55 Mn(n,2n) 54 Mn, 55 Mn(n,α) 52 V, 63 Cu(n,α) 60 Co, 65 Cu(n,2n) 64 Cu, and 65 Cu(n,p) 65 Ni reactions from 13.47 to 14.83 MeV. The experimental cross sections are compared with the results of calculations including all activation channels for the stable isotopes of Mn and Cu, for neutron incident energies up to 50 MeV. Within the energy range up to 20 MeV the model calculations are most sensitive to the parameters related to nuclei in the early stages of the reaction, while the model assumptions are better established by analysis of the data in the energy range 20-40 MeV. While the present analysis has taken advantage of both a new set of accurate measured cross sections around 14 MeV and the larger data basis fortunately available between 20 and 40 MeV for the Mn and Cu isotopes, the need of additional measurements below as well as above 40 MeV is pointed out.

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Analysis of emission mechanisms in nucleon-induced reactions around the Fermi energy

Cited by 7 publications

References 34 publications

Aspects of the momentum dependence of the equation of state and of the residualNNcross section, and their effects on nuclear stopping

Aspects of the momentum dependence of the equation of state and of the residualNNcross section, and their effects on nuclear stopping

Revisiting an extended-mean-field approach in heavy-ion collisions around the Fermi energy

Fast-neutron induced pre-equilibrium reactions on 55Mn and 63,65Cu at energies up to 40 MeV

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