Fragmentation path of excited nuclear systems

Colonna, M.; Fabbri, G.; Toro, M. Di; Matera, F.; Wolter, H.H.

doi:10.1016/j.nuclphysa.2004.07.001

Cited by 30 publications

(32 citation statements)

References 37 publications

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“…We follow two methods to include the fluctuations effects. The Stochastic Mean Field (SMF ) approach, [52,154,155], and a simplified procedure, computationally much easier [83,156,161,162], based on the introduction of density fluctuations by a random sampling of the phase space, (Phase Space Sampling, P SS). The amplitude of the noise is gauged to reproduce the dynamics of the most unstable modes [83].…”

Section: Stochastic Bnv Transport Theorymentioning

confidence: 99%

Reaction dynamics with exotic nuclei

et al. 2005

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Iste magistrorum locus est simul et puerorum, mittunt quando volunt hic res quas perdere nolunt [1]. AbstractWe review the new possibilities offered by the reaction dynamics of asymmetric heavy ion collisions, using stable and unstable beams. We show that it represents a rather unique tool to probe regions of highly Asymmetric Nuclear Matter (AN M ) in compressed as well as dilute phases, and to test the in-medium isovector interaction for high momentum nucleons. The focus is on a detailed study of the symmetry term of the nuclear Equation of State (EOS) in regions far away from saturation conditions but always under laboratory controlled conditions. Thermodynamic properties of AN M are surveyed starting from nonrelativistic and relativistic effective interactions. In the relativistic case the role of the isovector scalar δ-meson is stressed. The qualitative new features of the liquid-gas phase transition, "diffusive" instability and isospin distillation, are discussed. The results of ab-initio simulations of n-rich, n-poor, heavy ion collisions, using stochastic isospin dependent transport equations, are analysed as a function of beam energy and centrality. The isospin dynamics plays an important role in all steps of the reaction, from prompt nucleon emissions to the final fragments. The isospin diffusion is also of large interest, due to the interplay of asymmetry and density gradients. In relativistic collisions, the possibility of a direct study of the covariant structure of the effective nucleon interaction is shown. Results are discussed for particle production, collective flows and iso-transparency.Perspectives of further developments of the field, in theory as well as in experiment, are presented.

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Section: Stochastic Bnv Transport Theorymentioning

confidence: 99%

Reaction dynamics with exotic nuclei

et al. 2005

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“…It is based on mean field transport theory with correlations from hard nucleon-nucleon collisions and with stochastic fluctuations acting on the mean phase-space trajectory. 8,9 Stochasticity is essential in order to allow the growth of dynamical instabilities with fragment production, and to obtain physical widths of distributions of observables. A detailed description of the procedure is given in ref.…”

Section: -7mentioning

confidence: 99%

Investigation of Low-Density Symmetry Energy via Nucleon and Fragment Observables

Wolter¹,

Rizzo²,

Colonna³

et al. 2008

Exotic States of Nuclear Matter

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With stochastic transport simulations we study in detail central and peripheral collisions at Fermi energies and suggest new observables, sensitive to the symmetry energy below normal density. Keywords: symmetry energy, isospin transport coefficients, neck fragmentationThere has been much interest in recent years in the determination of the nuclear symmetry energy as a function of density, which is important for the structure of exotic nuclei as well as for astrophysical processes. Heavy ion collisions (HIC) present an attractive way to constrain the the existing models for this poorly-determined isovector equation-of-state (iso-EOS), 1 which can be investigated both at densities above and below normal density with relativistic energies and in the Fermi energy domain, respectively. However, observables, which are both sensitive to the iso-EOS and testable experimentally, still have to be identified clearly. 2,3In this report we discuss dissipative collisions at Fermi energies. Isospin dynamics at low and intermediate energies and its relation to the symmetry energy has, in fact, attracted much attention in recent years in experiment as well as in theory. 4-7Here we focus our attention on pre-equilibrium emission in central collisions and on the charge equilibration dynamics in peripheral collisions, where we expect to see

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“…as well as other equilibrium and non-equilibrium properties of nuclear matter far from its normal state [5][6][7][8][9][10][11]. Interpretation of the experimental results requires comparisons of data to predictions from transport models which take into account reaction dynamics.…”

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confidence: 99%

Effect of isospin-dependent cluster recognition on the observables in heavy ion collisions

Zhang

Zhou

et al. 2012

Phys. Rev. C

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We introduce isospin dependence in the cluster recognition algorithms used in the Quantum Molecular Dynamics model to describe fragment formation in heavy ion collisions. This change reduces the yields of emitted nucleons and enhances the yields of fragments, especially heavier fragments. The enhancement of neutron-rich lighter fragments mainly occurs at mid-rapidity.Consequently, isospin dependent observables, such as isotope distributions, yield ratios of n/p, t/ 3 He, and isoscaling parameters are affected. We also investigate how equilibration in heavy ion collisions is affected by this change.

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Fragmentation path of excited nuclear systems

Cited by 30 publications

References 37 publications

Reaction dynamics with exotic nuclei

Reaction dynamics with exotic nuclei

Investigation of Low-Density Symmetry Energy via Nucleon and Fragment Observables

Effect of isospin-dependent cluster recognition on the observables in heavy ion collisions

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