Couplings between dipole and quadrupole vibrations in tin isotopes

Simenel, C.; Chomaz, Ph.

doi:10.1103/physrevc.80.064309

Cited by 40 publications

(61 citation statements)

References 54 publications

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“…In addition to energies of GRs, TDHF has been used to study their strength distribution [11][12][13][53][54][55][56][57], their life-time and escape width [47,48], and their anharmonicities [37,38,58]. Escape width and Landau damping are accounted for in TDHF, however, two-body correlations responsible for the spreading width are neglected.…”

Section: Theoretical Framework and Numerical Detailsmentioning

confidence: 99%

“…New parametrizations should then be developed to improve the predictive power of these beyond mean-field calculations. It should be noted also that, in principle, TDHF calculations in the non-linear regime are sensitive to 3h1p and 3p1h matrix elements of the residual interaction [37,38]. However, their effect on, e.g., the spreading width of GRs has not been computed yet from TDHF evolutions.…”

Section: Introductionmentioning

confidence: 99%

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Structure and direct decay of Giant Monopole Resonances

Avez

Simenel

2013

Eur. Phys. J. A

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We study structure and direct decay of the Giant Monopole Resonance (GMR) at the RPA level using the Time-Dependent Energy Density Functional method in the linear response regime in a few doubly-magic nuclei. A proper treatment of the continuum, through the use of large coordinate space, allows for a separation between the nucleus and its emitted nucleons. The microscopic structure of the GMR is investigated with the decomposition of the strength function into individual single-particles quantum numbers. A similar microscopic decomposition of the spectra of emitted nucleons by direct decay of the GMR is performed. In this harmonic picture of giant resonance, shifting every contribution by the initial single-particle energy allows to reconstruct the GMR strength function. The RPA residual interaction couples bound 1-particle 1-hole states to unbound ones, allowing for the total decay of the GMR. In this article, we then intend to get an understanding of the direct decay mechanism from coherent one-particle-one-hole superpositions, while neglecting more complex configurations. Time-dependent beyond mean-field approaches should be use, in the future, to extend this method.

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Section: Theoretical Framework and Numerical Detailsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Structure and direct decay of Giant Monopole Resonances

Avez

Simenel

2013

Eur. Phys. J. A

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“…It is expected to provide a better description of heavy-ion collisions [43][44][45][46][47][48][49][50] and resonance dynamics [51][52][53][54][55][56]. The purpose of present article is to systematically investigate the dissipation dynamics in deep-inelastic collisions and the role of spinorbit force by using modern TDHF calculations.…”

Section: Introductionmentioning

confidence: 99%

Dissipation dynamics and spin-orbit force in time-dependent Hartree-Fock theory

et al. 2014

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We investigate the one-body dissipation dynamics in heavy-ion collisions of 16 O+ 16 O using a fully three-dimensional time-dependent Hartree-Fock (TDHF) theory with the modern Skyrme energy functional and without any symmetry restrictions. The energy dissipation is revealed to decrease in deep-inelastic collisions of the light systems as the bombarding energy increases owing to the competition between collective motion and single-particle degrees of freedom. The role of spin-orbit force is given particular emphasis in deep-inelastic collisions. The spin-orbit force causes a significant enhancement of the dissipation. The time-even coupling of spin-orbit force plays a dominant role at low energies, while the influence of time-odd terms is notable at high energies. About 40-65% of the total dissipation depending on the different parameter sets is predicted to arise from the spin-orbit force. The theoretical fusion cross section has a reasonably good agreement with the experimental data, considering that no free parameters are adjusted to reaction dynamics in the TDHF approach.

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“…This method has been widely applied to study giant-resonances [65-67, 74, 79, 80], but more rarely to low-lying vibrations [46,72,74]. Although TDHF calculations can be used to study non-linear vibrations [81,82], the extraction of the transition strength relies on the linear regime, in which case it is equivalent to the random phase approximation (RPA). Note that TDHF in coordinate space allows for particle evaporation [83,84] and thus the escape width is included.…”

Section: A Nuclear Vibrationsmentioning

confidence: 99%

Dynamical effects in fusion with exotic nuclei

2016

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Background:Reactions with stable beams have demonstrated a strong interplay between nuclear structure and fusion. Exotic beam facilities open new perspectives to understand the impact of neutron skin, large isospin, and weak binding energies on fusion. Microscopic theories of fusion are required to guide future experiments.Purpose: To investigate new effects of exotic structures and dynamics in near-barrier fusion with exotic nuclei.Method: Microscopic approaches based on the Hartree-Fock (HF) mean-field theory are used for studying fusion barriers in 40−54 Ca+ 116 Sn reactions for even isotopes. Bare potential barriers are obtained assuming frozen HF ground-state densities. Dynamical effects on the barrier are accounted for in time-dependent Hartree-Fock (TDHF) calculations of the collisions. Vibrational couplings are studied in the coupled-channel framework and near-barrier nucleon transfer is investigated with TDHF calculations.Results: The development of a neutron skin in exotic calcium isotopes strongly lowers the bare potential barrier. However, this static effect is not apparent when dynamical effects are included. On the contrary, a fusion hindrance is observed in TDHF calculations with the most neutron rich calcium isotopes which cannot be explained by vibrational couplings. Transfer reactions are also important in these systems due to charge equilibration processes.Conclusions: Despite its impact on the bare potential, the neutron skin is not seen as playing an important role in the fusion dynamics. However, the charge transfer with exotic projectiles could lead to an increase of the Coulomb repulsion between the fragments, suppressing fusion. The effect of transfer and dissipative mechanisms on fusion with exotic nuclei deserve further studies.

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Couplings between dipole and quadrupole vibrations in tin isotopes

Cited by 40 publications

References 54 publications

Structure and direct decay of Giant Monopole Resonances

Structure and direct decay of Giant Monopole Resonances

Dissipation dynamics and spin-orbit force in time-dependent Hartree-Fock theory

Dynamical effects in fusion with exotic nuclei

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