Isospin fractionation and isoscaling in dynamical simulations of nuclear collisions

Ono, Akira; Danielewicz, Paweł; Friedman, William A.; Lynch, W. G.; Tsang, M.B.

doi:10.1103/physrevc.68.051601

Cited by 207 publications

(299 citation statements)

References 16 publications

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“…This is possible only if the isoscaling parameters α are linearly related to the isospin asymmetry, δ, of the projectile residues. This has been shown both experimentally and theoretically [12,18,49] in central collisions.…”

Section: B Isospin Transport Ratio R Imentioning

confidence: 91%

Influence of in-mediumNNcross sections, symmetry potential, and impact parameter on isospin observables

et al. 2012

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We explore the influence of in-medium nucleon-nucleon cross section, symmetry potential and impact parameter on isospin sensitive observables in intermediate-energy heavy-ion collisions with the ImQMD05 code, a modified version of Quantum Molecular Dynamics model. At incident velocities above the Fermi velocity, we find that the density dependence of symmetry potential plays a more important role on the double neutron to proton ratio DR(n/p) and the isospin transport ratio R i than the in-medium nucleon-nucleon cross sections, provided that the latter are constrained to a fixed total NN collision rate. We also explore both DR(n/p) and R i as a function of the impact parameter. Since the copious production of intermediate mass fragments is a distinguishing feature of intermediate-energy heavy-ion collisions, we examine the isospin transport ratios constructed from different groups of fragments. We find that the values of the isospin transport ratios for projectile rapidity fragments with Z ≥ 20 are greater than those constructed from the entire projectile rapidity source. We believe experimental investigations of this phenomenon can be performed. These may provide significant tests of fragmentation time scales predicted by ImQMD calculations.2

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Section: B Isospin Transport Ratio R Imentioning

confidence: 91%

Influence of in-mediumNNcross sections, symmetry potential, and impact parameter on isospin observables

et al. 2012

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“…C is an overall normalization factor, and α and β are the parameters characterizing the isoscaling behavior. The observation is also theoretically predicted by the statistical and the dynamical multifragmentation models [4,5,6]. In these models, the difference in the chemical potential of systems with different N/Z is directly related to the scaling parameter α, which is further related to the symmetry energy through a relation,…”

Section: Symmetry Energy and The Isotopic Yield Distributionmentioning

confidence: 93%

Constraining the density dependence of the symmetry energy in the nuclear equation of state using heavy ion beams

Shetty

Yennello

Souliotis

2007

Nuclear Instruments and Methods in Physics Research Section B:

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The density dependence of the symmetry energy in the equation of state of asymmetric nuclear matter (N/Z > 1) is important for understanding the structure of systems as diverse as the atomic nuclei and neutron stars. Due to a proper lack of understanding of the basic nucleon-nucleon interaction for matters that are highly asymmetric and at non-normal nuclear density, this very important quantity has remained largely unconstrained. Recent studies using beams from the Cyclotron Institute of Texas A&M University, constraining the density dependence of the symmetry energy, is presented. A dependence of the form E sym (ρ) = C(ρ/ρ o ) γ , where C = 31.6 MeV and γ = 0.69, is obtained from the dynamical and statistical model analysis. Their implications to both astrophysical and nuclear physics studies are discussed.

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“…The determined neutron skin was R skin = 0.33 +0. 16 −0.18 fm. However such a large error is not enough to constrain the various nuclear models.…”

Section: Resultsmentioning

confidence: 99%

“…Actually there is a variety of neutron star properties which are sensitive to SE, that is the maximum mass value and the corresponding radius, the onset of the direct Urca process, the crust-core transition density and pressure e.t.c. [2,9] Recently, there is an extended theoretical [10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,57,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,…”

Section: Introductionmentioning

confidence: 99%

Effects of the symmetry energy on the isovector properties of neutron-rich nuclei within a Thomas-Fermi approach

Papazoglou

Moustakidis

2014

Phys. Rev. C

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We employ a variational method, in the framework of the Thomas-Fermi approximation, to study the effect of the symmetry energy on the neutron skin thickness and the symmetry energy coefficients of various neutron rich nuclei. We concentrate our interest on 208 Pb, 124 Sn, 90 Zr, and 48 Ca, although the method can be applied in the totality of medium and heavy neutron rich nuclei. Our approach has the advantage that the isospin asymmetry function α(r), which is the key quantity to calculate isovector properties of various nuclei, is directly related with the symmetry energy as a consequence of the variational principle. Moreover, the Coulomb interaction is included in a self-consistent way and its effects can be separated easily from the nucleon-nucleon interaction. We confirm, both qualitatively and quantitatively, the strong dependence of the symmetry energy on the various isovector properties for the relevant nuclei, using possible constraints between the slope and the value of the symmetry energy at the saturation density. PACS number(s): 21.65. Ef, 21.65.Mn, 21.65.Cd, 21.10.Gv

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Isospin fractionation and isoscaling in dynamical simulations of nuclear collisions

Cited by 207 publications

References 16 publications

Influence of in-mediumNNcross sections, symmetry potential, and impact parameter on isospin observables

Influence of in-mediumNNcross sections, symmetry potential, and impact parameter on isospin observables

Constraining the density dependence of the symmetry energy in the nuclear equation of state using heavy ion beams

Effects of the symmetry energy on the isovector properties of neutron-rich nuclei within a Thomas-Fermi approach

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