Present Status of Hirfl in Lanzhou

Wenlong, Zhan; Xu, H. S.; Sun, Zhigang; Xiao, Guoqing; Xia, J.W.; Zhao, Hongwei; Song, M. T.; Yuan, Y. J.; GROUP, HIRFL-CSR

doi:10.1142/s0218301306005526

Cited by 34 publications

(26 citation statements)

References 3 publications

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“…To the fourth order in isospin asymmetry, it is written as E(ρ,δ) = E 0 (ρ) + E sym (ρ)δ 2 + E sym,4 (ρ)δ 4 + O(δ 6 ), (1) where E 0 (ρ) = E(ρ, δ = 0) is the binding energy per nucleon of symmetric nuclear matter and…”

Section: A Equation Of State Of Asymmetric Nuclear Mattermentioning

confidence: 99%

“…For cold nuclear matter, the EOS is usually defined as the binding energy per nucleon as a function of the density, from which information on other thermodynamic properties of nuclear matter, such as its pressure and incompressibility, can be obtained. With the establishment or construction of many radioactive beam facilities around the world, such as the Cooling Storage Ring (CSR) facility at HIRFL in China [1], the Radioactive Ion Beam (RIB) Factory at RIKEN in Japan [2], the FAIR/GSI in Germany [3], SPIRAL2/GANIL in France [4], and the Facility for Rare Isotope Beams (FRIB) in the United States [5], it is possible in terrestrial laboratories to explore the EOS of isospin asymmetric nuclear matter under the extreme condition of large isospin asymmetry, especially with regard to the density dependence of the nuclear symmetry energy. This knowledge, especially the latter, is important for understanding not only the structure of radioactive nuclei, the reaction dynamics induced by rare isotopes, and the liquid-gas phase transition in asymmetric nuclear matter but also many critical issues in astrophysics [6][7][8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

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Higher-order effects on the incompressibility of isospin asymmetric nuclear matter

et al. 2009

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Analytical expressions for the saturation density of asymmetric nuclear matter as well as its binding energy and incompressibility at saturation density are given up to fourth order in the isospin asymmetry δ = (ρ n − ρ p )/ρ using 11 characteristic parameters defined by the density derivatives of the binding energy per nucleon of symmetric nuclear matter, the symmetry energy E sym (ρ), and the fourth-order symmetry energy E sym,4 (ρ) at normal nuclear density ρ 0 . Using an isospin-and momentum-dependent modified Gogny interaction (MDI) and the Skyrme-Hartree-Fock (SHF) approach with 63 popular Skyrme interactions, we have systematically studied the isospin dependence of the saturation properties of asymmetric nuclear matter, particularly the incompressibilityat saturation density. Our results show that the magnitude of the higher order K sat,4 parameter is generally small compared to that of the K sat,2 parameter. The latter essentially characterizes the isospin dependence of the incompressibility at saturation density and can be expressed asL, where L and K sym represent, respectively, the slope and curvature parameters of the symmetry energy at ρ 0 and J 0 is the third-order derivative parameter of symmetric nuclear matter at ρ 0 . Furthermore, we have constructed a phenomenological modified Skyrme-like (MSL) model that can reasonably describe the general properties of symmetric nuclear matter and the symmetry energy predicted by both the MDI model and the SHF approach. The results indicate that the higher order J 0 contribution to K sat,2 generally cannot be neglected. In addition, it is found that there exists a nicely linear correlation between K sym and L as well as between J 0 /K 0 and K 0 . These correlations together with the empirical constraints on K 0 , L, E sym (ρ 0 ), and the nucleon effective mass lead to an estimate of K sat,2 = −370 ± 120 MeV.

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Section: A Equation Of State Of Asymmetric Nuclear Mattermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Higher-order effects on the incompressibility of isospin asymmetric nuclear matter

et al. 2009

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“…Besides the many existing radioactive beam facilities and their upgrades, such as the Cooling Storage Ring (CSR) facility at HIRFL in China [1] , many more are being constructed or under planning, including the Radioactive Ion Beam (RIB) Factory at RIKEN in Japan [2] , the FAIR/GSI in Germany [3] , SPIRAL2/GANIL in France [4] , and the Facility for Rare Isotope Beams (FRIB) in the USA [5] . These new facilities offer the possibility to study the properties of nuclear matter or nuclei under the extreme condition of large isospin asymmetry.…”

Section: Equation Of State Of Nuclear Matter Isospin the Symmetry Ementioning

confidence: 99%

A phenomenological equation of state for isospin asymmetric nuclear matter

Chen

2009

Sci. China Ser. G-Phys. Mech. Astron.

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A phenomenological momentum-independent (MID) model is constructed to describe the equation of state (EOS) for isospin asymmetric nuclear matter, especially the density dependence of the nuclear symmetry energy Esym(ρ). This model can reasonably describe the general properties of the EOS for symmetric nuclear matter and the symmetry energy predicted by both the sophisticated isospin and momentum dependent MDI model and the Skyrme-Hartree-Fock approach. We find that there exists a nicely linear correlation between Ksym and L as well as between J 0 /K 0 and K 0 , where L and Ksym represent, respectively, the slope and curvature parameters of the symmetry energy at the normal nuclear density ρ 0 , while K 0 and J 0 are, respectively, the incompressibility and the third-order derivative parameter of symmetric nuclear matter at ρ 0 . These correlations together with the empirical constraints on K 0 , L and Esym(ρ 0 ) lead to an estimation of −477 MeV K sat,2 −241 MeV for the second-order isospin asymmetry expansion coefficient for the incompressibility of asymmetric nuclear matter at the saturation point. equation of state of nuclear matter, isospin, the symmetry energyThe study of the isospin degree of freedom in nuclear physics has recently attracted much attention due to the establishment of many radioactive beam facilities around the world. Besides the many existing radioactive beam facilities and their upgrades, such as the Cooling Storage Ring (CSR) facility at HIRFL in China [1] , many more are being constructed or under planning, including the Radioactive Ion Beam (RIB) Factory at RIKEN in Japan [2] , the FAIR/GSI in Germany [3] , SPIRAL2/GANIL in France [4] , and the Facility for Rare Isotope Beams (FRIB) in the USA [5] . These new facilities offer the possibility to study the properties of nuclear matter or nuclei under the extreme condition of large isospin asymmetry. The ultimate goal of such study is to extract information on the isospin dependence of in-medium nuclear effective interactions as well as the equation of state (EOS) of isospin asymmetric nuclear matter, particularly its isospin-dependent term or the density dependence of the nuclear symmetry energy. This knowledge, especially the latter, is important for understand-

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“…The EOS of isospin asymmetric nuclear matter, given by its binding energy per nucleon, can be generally written as E(ρ, α) = E(ρ, α = 0) + E sym (ρ)α 2 + O(α 4 ), (1) where ρ = ρ n + ρ p is the baryon density with ρ n and ρ p denoting the neutron and proton densities, respectively; α = (ρ n − ρ p )/(ρ p + ρ n ) is the isospin asymmetry; E(ρ, α = 0) is the binding energy per nucleon in symmetric nuclear matter, and…”

Section: Introductionmentioning

confidence: 99%

Isospin-dependent properties of asymmetric nuclear matter in relativistic mean field models

2007

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Using various relativistic mean-field models, including the nonlinear ones with meson field selfinteractions, those with density-dependent meson-nucleon couplings, and the point-coupling models without meson fields, we have studied the isospin-dependent bulk and single-particle properties of asymmetric nuclear matter. In particular, we have determined the density dependence of nuclear symmetry energy from these different relativistic mean-field models and compare the results with the constraints recently extracted from analyses of experimental data on isospin diffusion and isotopic scaling in intermediate-energy heavy ion collisions as well as from measured isotopic dependence of the giant monopole resonances in even-A Sn isotopes. Among the 23 parameter sets in the relativistic mean-filed model that are commonly used for nuclear structure studies, only a few are found to give symmetry energies that are consistent with the empirical constraints. We have also studied the nuclear symmetry potential and the isospin-splitting of the nucleon effective mass in isospin asymmetric nuclear matter. We find that both the momentum dependence of the nuclear symmetry potential at fixed baryon density and the isospin-splitting of the nucleon effective mass in neutron-rich nuclear matter depend not only on the nuclear interactions but also on the definition of the nucleon optical potential.

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Present Status of Hirfl in Lanzhou

Cited by 34 publications

References 3 publications

Higher-order effects on the incompressibility of isospin asymmetric nuclear matter

Higher-order effects on the incompressibility of isospin asymmetric nuclear matter

A phenomenological equation of state for isospin asymmetric nuclear matter

Isospin-dependent properties of asymmetric nuclear matter in relativistic mean field models

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