Isospin emission and flow at high baryon density: A test of the symmetry potential

Giordano, V.; Colonna, M.; Toro, M. Di; Greco, V.; Rizzo, J.

doi:10.1103/physrevc.81.044611

Cited by 84 publications

(105 citation statements)

References 35 publications

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“…While it is claimed that the neutron-proton elliptic flow difference is influenced to some extent by the momentum dependence of the nuclear symmetry potential in Refs. [49,52], it was reported in Ref. [53] that the flow difference does not exhibit a visible sensitivity to the momentum dependent part of the isovector nucleon potential within the constraint of an asy-soft EoS, although the neutron-proton differential transverse flow does.…”

Section: Introductionmentioning

confidence: 99%

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Constraining the high-density nuclear symmetry energy with the transverse-momentum-dependent elliptic flow

Wang

Guo

et al. 2014

Phys. Rev. C

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Within the newly updated version of the ultrarelativistic quantum molecular dynamics (UrQMD) model, the transverse-velocity dependence of the elliptic flow of free nucleons from 197 Au+ 197 Au collisions at the incident energy 400 MeV/nucleon is studied within different windows of the normalized c.m. rapidity y 0 . It is found that the elliptic flow difference v n 2 -v p 2 and ratio v n 2 /v p 2 of neutrons versus protons are sensitive to the density dependence of the symmetry energy, especially the ratio v n 2 /v p 2 at small transverse velocity in the intermediate rapidity intervals 0.4 < |y 0 | < 0.6. By comparing either transverse-momentum dependent or integrated FOPI/LAND elliptic flow data of nucleons and hydrogen isotopes with calculations using various Skyrme interactions, all exhibiting similar values of isoscalar incompressibility but very different density dependences of the symmetry energy, a moderately soft to linear symmetry energy is extracted, in good agreement with previous UrQMD or Tübingen QMD model calculations but contrasting results obtained with π − /π + yield ratios available in the literature.

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Section: Introductionmentioning

confidence: 99%

“…HICs have been discussed recently [46][47][48][49][50][51][52][53]. But, it is still unclear whether the effective mass of neutrons is larger or smaller than that of protons in, for example, the neutron-rich nuclear medium [1,[54][55][56].…”

Section: Introductionmentioning

confidence: 99%

Constraining the high-density nuclear symmetry energy with the transverse-momentum-dependent elliptic flow

Wang

Guo

et al. 2014

Phys. Rev. C

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“…Thus, the flow is reduced and even coincides with protons. Furthermore, a larger mass splitting (stronger isovector momentumdependent interaction) increases the squeeze out neutrons and consequently results in an lower elliptic flows for neutrons [22]. The stiffness of the symmetry energy slightly affect the flow spectrum.…”

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confidence: 99%

Effective mass splitting of neutron and proton and isospin emission in heavy-ion collisions

Feng

2012

Nuclear Physics A

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Within the framework of an isospin and momentum dependent transport model, the emissions of isospin particles (nucleons and light clusters) squeezed out in heavy-ion collisions are investigated as probes of the poorly known symmetry energy at high baryon density. Two different mass splittings of neutrons and protons in nuclear medium as m * n > m * p and m * n < m * p are used in the model and their influence on the isospin emission in heavy-ion collisions is discussed thoroughly.The competition between the stiffness and the momentum dependence of the symmetry potential on reaction dynamics are compared and systematically analyzed. It is found that the difference of the neutron and proton directed flows and the transverse momentum distribution of the neutron/proton ratio are sensitive to the stiffness of the symmetry energy, which can not be changed with the controversial effective mass splitting. The elliptic flows of free nucleons at high transverse momentum within mid-rapidity emission are a promising observable as distinguishing the nucleon effective mass splitting.PACS : 21.65.Ef, 24.10.Lx, 25.75.-q Keywords: isospin and momentum dependent transport model; isospin particles; symmetry energy; effective mass splitting It has been well established the fact that the effective nucleon mass in nuclear matter or finite nuclei deviates from its vacuum value [1,2]. Moreover, a splitting of neutron and proton effective mass (here, the nonrelativistic mass (Landau mass) is concerned in accordance with the definition in Ref.[3]) appears in neutron-rich matter, which increases with the isospin asymmetry.

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“…The elliptic flow corresponds to the second Fourier coefficient in the transverse-momentum distribution and can be expressed as [31,[43][44][45] …”

Section: Resultsmentioning

confidence: 99%

Effects of the high-momentum tail of nucleon momentum distribution on the isospin-sensitive observables

Zhang

Yong

2016

Eur. Phys. J. A

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Based on the Isospin-dependent transport model Boltzmann-Uehling-Uhlenbeck (IBUU), effects of the high momentum tail (HMT) of nucleon momentum distribution in colliding nuclei on some isospin-sensitive observables are studied in the semi-central 197 Au+ 197 Au reactions at incident beam energy of 400 MeV/nucleon. It is found that the nucleon transverse flow, the difference of neutron and proton transverse flows, the nucleon elliptic flow and free neutron to proton ratio are all less sensitive to the HMT, while the isospin-sensitive nucleon elliptic flow difference is clearly affected by the HMT. Except at very high kinetic energies, the kinetic energy distributions of π − , π + and charged pion ratio π − /π + are all sensitive to the HMT.

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Isospin emission and flow at high baryon density: A test of the symmetry potential

Cited by 84 publications

References 35 publications

Constraining the high-density nuclear symmetry energy with the transverse-momentum-dependent elliptic flow

Constraining the high-density nuclear symmetry energy with the transverse-momentum-dependent elliptic flow

Effective mass splitting of neutron and proton and isospin emission in heavy-ion collisions

Effects of the high-momentum tail of nucleon momentum distribution on the isospin-sensitive observables

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