Sensitivity of intermediate mass fragment flows to the symmetry energy

Kohley, Z.; Colonna, M.; Bonasera, A.; May, L. W.; Wuenschel, S.; Toro, M. Di; Galanopoulos, S.; Hagel, K.; Mehlman, M.; Smith, W. B.; Souliotis, G. A.; Soisson, S. N.; Stein, B. C.; Tripathi, R.; Yennello, S. J.; Zielińska-Pfabé, M.

doi:10.1103/physrevc.85.064605

Cited by 30 publications

(11 citation statements)

References 55 publications

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“…Improved quantum molecular dynamics simulations describing both isospin diffusion data and double ratios of neutron and proton spectra, support a similar range of L values for a symmetry energy at saturation between 28 and 34 MeV [16]. Experiments on transverse collective flows of hydrogen and helium isotopes [95,96] favor similar values of L, as well as the predictions from neutron-proton emission data [15] (L ∼ 50 MeV) and the isotopic-scaling results of ref. [14] (L ∼ 65 MeV).…”

Section: Discussion Of Results and Comparison With Other Estimates Ofsupporting

confidence: 62%

Density dependence of the symmetry energy from neutron skin thickness in finite nuclei

et al. 2014

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Abstract. The density dependence of the symmetry energy around saturation density, characterized by the slope parameter L, is studied using information provided by the neutron skin thickness in finite nuclei. An estimate for L is obtained from experimental data on neutron skins extracted from antiprotonic atoms. We also discuss the ability of parity-violating elastic electron scattering to obtain information on the neutron skin thickness in 208 Pb and to constrain the density dependence of the nuclear symmetry energy. The size and shape of the neutron density distribution of 208 Pb predicted by mean-field models is briefly addressed. We conclude with a comparative overview of the L values predicted by several existing determinations.

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Section: Discussion Of Results and Comparison With Other Estimates Ofsupporting

confidence: 62%

Density dependence of the symmetry energy from neutron skin thickness in finite nuclei

et al. 2014

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“…Clearly, this is an unsatisfactory state of affairs. This situation has stimulated various efforts for code comparison [124][125][126][127]. Earlier attempts to analyze the situation took place in workshops at Trento in 2004 (for particle production at 1 GeV/u [124]) and in 2009 (for flow at 100 MeV/u and 400 MeV/u).…”

Section: Transport Codesmentioning

confidence: 99%

A way forward in the study of the symmetry energy: experiment, theory, and observation

Horowitz

Brown

Kim

et al. 2014

J. Phys. G: Nucl. Part. Phys.

305

307

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The symmetry energy describes how the energy of nuclear matter rises as one goes away from equal numbers of neutrons and protons. This is very important to describe neutron rich matter in astrophysics. This article reviews our knowledge of the symmetry energy from theoretical calculations, nuclear structure measurements, heavy ion collisions, and astronomical observations. We then present a roadmap to make progress in areas of relevance to the symmetry energy that promotes collaboration between the astrophysics and the nuclear physics communities.

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“…Moreover, through comparing with the FOPI data [4], the calculational results of different transport models were opposite. For example, a very soft nuclear symmetry energy was suggested by the isospin-dependent Boltzmann-Uehling-Uhlenbeck model (IBUU04) [5], and a hard one was predicted by the stochastic mean-field approach (SMF) [6] and the improved isospin-dependent quantum molecular dynamics model (ImIQMD) [7]. Therefore, further investigations of nuclear symmetry energy by improving the theoretical models or proposing a new theoretical model are still necessary.…”

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confidence: 98%

Symmetry energy and pion production in the Boltzmann–Langevin approach

et al. 2013

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Based on the improved isospin-dependent Boltzmann-Langevin model which incorporates the dynamical fluctuations, we study the π production in central heavy ion collisions at different incident energies from 250 to 1200 A MeV. It is found that the π multiplicity is sensitive to the nuclear equation of state. At π subthreshold energy, the fluctuations have a larger effect on the π multiplicity. The π − /π + ratios as a probe of nuclear symmetry energy are calculated with different stiffness of symmetry energy. The results favor a supersoft symmetry energy of the potential term in comparison with the FOPI data, which supports the one obtained by the usual Boltzmann-Uehling-Uhlenbeck model.During the last few years, the study of nuclear symmetry energy E sym (ρ) has been a highly interesting subject. The constraining of E sym (ρ) is important for not only understanding of heavy-ion reactions [1] but also many issues in astrophysics [1,2].Unfortunately, the form of E sym (ρ) is very controversial, especially at supra-saturation density. At sub-saturation density, constraints on the E sym (ρ) were obtained by analyzing the isospin diffusion data [3]. At supra-saturation density, the main difference of the E sym (ρ) forms predicted by some microscopical or phenomenological many-body approaches is the trend of the E sym (ρ) with the density. One is the E sym (ρ) increases continuously with the increasing density, and the other is the E sym (ρ) increases

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Sensitivity of intermediate mass fragment flows to the symmetry energy

Cited by 30 publications

References 55 publications

Density dependence of the symmetry energy from neutron skin thickness in finite nuclei

Density dependence of the symmetry energy from neutron skin thickness in finite nuclei

A way forward in the study of the symmetry energy: experiment, theory, and observation

Symmetry energy and pion production in the Boltzmann–Langevin approach

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