Elliptic flow in intermediate energy heavy ion collisions and in-medium effects

Persram, Declan; Gale, Charles

doi:10.1103/physrevc.65.064611

Cited by 83 publications

(88 citation statements)

References 49 publications

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“…However, very little work has been done so far about the isospin dependence of the in-medium NN cross sections in asymmetric nuclear matter although extensive studies have been carried out in symmetric matter based on various many-body theories and/or phenomenological approaches, see, e.g., Refs. [209,281,399,404]. Therefore, only some information about the density dependence of the σ np /σ pp ratio in symmetric nuclear matter can be found in the literature.…”

Section: Isospin Dependence Of Nn Cross Sections In Neutron-rich Mattermentioning

confidence: 99%

“…Knowledge about nucleon effective mass in neutron-rich matter is essential for understanding a number of properties of neutron stars [278][279][280]. It is also important for the reaction dynamics of nuclear collisions induced by radioactive nuclei, such as the degree and rate of isospin diffusion, the neutron-proton differential collective flow, and the isospin equilibration [48,50,209,281].…”

Section: Isospin-splitting Of the Neutron And Proton Effective Massesmentioning

confidence: 99%

“…[199] where a momentum-dependent single-particle potential is used, and the resulting EOS reproduces the results of microscopic VMB approach [110] and is further used to study the properties of neutron stars. An important feature of the potential model is that it can be easily and directly used in transport models for heavy-ion collisions [200][201][202][203][204][205][206][207][208][209]. In particular, an isospin-and momentum-dependent potential model has been recently proposed based on an isospin-and momentum-dependent MDI interaction, which is derived from the Hartree-Fock approximation with a modified Gogny effective interaction [210].…”

Section: The Phenomenological Approachmentioning

confidence: 99%

“…Based on an effective mass scaling model [209,276,281], the isospin dependence of NN cross sections in neutron-rich matter was recently studied in Ref. [56].…”

Section: Isospin Dependence Of Nn Cross Sections In Neutron-rich Mattermentioning

confidence: 99%

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Recent progress and new challenges in isospin physics with heavy-ion reactions

2008

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The ultimate goal of studying isospin physics via heavy-ion reactions with neutron-rich, stable and/or radioactive nuclei is to explore the isospin dependence of in-medium nuclear effective interactions and the equation of state of neutron-rich nuclear matter, particularly the isospin-dependent term in the equation of state, i.e., the density dependence of the symmetry energy. Because of its great importance for understanding many phenomena in both nuclear physics and astrophysics, the study of the density dependence of the nuclear symmetry energy has been the main focus of the intermediate-energy heavy-ion physics community during the last decade, and significant progress has been achieved both experimentally and theoretically. In particular, a number of phenomena or observables have been identified as sensitive probes to the density dependence of the nuclear symmetry energy. Experimental studies have confirmed some of these interesting isospin-dependent effects and allowed us to constrain relatively stringently the symmetry energy at sub-saturation densities. The impacts of this constrained density dependence of the symmetry energy on the properties of neutron stars have also been studied, and they were found to be very useful for the astrophysical community. With new opportunities provided by the various radioactive beam facilities being constructed around the world, the study of isospin physics is expected to remain one of the forefront research areas in nuclear physics. In this report, we review the major progress achieved during the last decade in isospin physics with heavy ion reactions and discuss future challenges to the most important issues in this field.Key words: Equation of state of asymmetric nuclear matter, Nuclear symmetry energy, Heavy-ion reactions with neutron-rich nuclei, Neutron skin thickness of heavy nuclei, Neutron stars Constraining the Skyrme effective interactions and the neutron skin thickness of heavy nuclei using terrestrial nuclear laboratory data 216 8

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Section: Isospin Dependence Of Nn Cross Sections In Neutron-rich Mattermentioning

confidence: 99%

Section: Isospin-splitting Of the Neutron And Proton Effective Massesmentioning

confidence: 99%

Section: The Phenomenological Approachmentioning

confidence: 99%

“…Based on an effective mass scaling model [209,276,281], the isospin dependence of NN cross sections in neutron-rich matter was recently studied in Ref. [56].…”

Section: Isospin Dependence Of Nn Cross Sections In Neutron-rich Mattermentioning

confidence: 99%

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Recent progress and new challenges in isospin physics with heavy-ion reactions

2008

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“…In semi-phenomenological approaches, one makes the assumption that the transition matrix in the medium is approximately the same as the one in vacuum and that medium effects come in only through the use of effective masses in the phase space factor [10][11][12]. Then, the in-medium cross section is scaled (relative to its value in vacuum) as the square of the ratio of the (reduced) masses.…”

Section: Introductionmentioning

confidence: 99%

Microscopic in-medium nucleon-nucleon cross sections with improved Pauli blocking effects

2013

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We present updated predictions of effective elastic nucleon-nucleon cross sections intended for use in nucleus-nucleus reactions. A novel characteristic of the present approach combines all microscopic medium effects included in the Dirac-Brueckner-Hartree-Fock G-matrix with a Pauli blocking mechanism which is more appropriate for applications in ion-ion reaction models as compared to a previous approach. The effective in-medium cross section is found to be quite sensitive to the description of Pauli blocking in the final configurations.

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