Isospin effects on two-nucleon correlation functions in heavy-ion collisions at intermediate energies

Chen, Lie‐Wen; Greco, V.; Ko, Che Ming; Li, Bao-An

doi:10.1103/physrevc.68.014605

Cited by 51 publications

(55 citation statements)

References 83 publications

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“…2), while the results with medium modifications (i.e., with reduced cross sections) show larger transparency. The conversion of Q zz (after integrating the whole momentum space) from negative to positive was also seen [25] and should be easily measurable by experiments. From Fig.…”

Section: Introductionmentioning

confidence: 99%

“…P = p 1 + p 2 and q = (p 1 − p 2 )/2 are the total and relative momenta of the particle pair, respectively. According to previous studies (see for examples, [25,32,33]), the effect of nuclear medium on neutron-neutron, neutron-proton correlation functions is more pronounced at smaller relative momentum (q) and larger total momentum (P ) than that with larger q or smaller P and that on proton-proton correlation function is more pronounced at q ∼ 20MeV/c and with larger P . In Fig.…”

Section: Introductionmentioning

confidence: 99%

“…It was also pointed out that the two-body correlation is unsensitive to both the isoscalar part of the EoS and in-medium cross sections [25]. In this work we elaborate on the sensitivity of the two-particle correlation function to the in-medium NN cross section.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, Chen et al [25] found that the two-nucleon correlation functions in neutron-rich 61A MeV 36 Ar+ 112,124 Sn reactions by Ghetti et al [27] and it seems that the two-particle correlation functions is indeed a useful probe for the isospin dependence of the nuclear EoS.…”

Section: Introductionmentioning

confidence: 99%

“…Its major advantage is the weak dependence on the uncertainties of the symmetry energy (for example, see Refs. [23,24,25]). Fig.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Medium modifications of the nucleon–nucleon elastic cross section in neutron-rich intermediate energy HICs

Li¹,

Li²,

Soff³

et al. 2006

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

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Several observables of unbound nucleons which are to some extent sensitive to the medium modifications of nucleon-nucleon elastic cross sections in neutron-rich intermediate energy heavy ion collisions are investigated. The splitting effect of neutron and proton effective masses on cross sections is discussed. It is found that the transverse flow as a function of rapidity, the Q zz as a function of momentum, and the ratio of halfwidths of the transverse to that of longitudinal rapidity distribution R t/l are very sensitive to the medium modifications of the cross sections. The transverse momentum distribution of correlation functions of two-nucleons does not yield information on the in-medium cross section.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Its major advantage is the weak dependence on the uncertainties of the symmetry energy (for example, see Refs. [23,24,25]). Fig.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Medium modifications of the nucleon–nucleon elastic cross section in neutron-rich intermediate energy HICs

Li¹,

Li²,

Soff³

et al. 2006

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

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Correlations and characterization of emitting sources

Verde

Chbihi

Ghetti

et al.

Dynamics and Thermodynamics With Nuclear Degrees of Freedom

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Difficulties in probing density dependent symmetry potential with the HBT interferometry

Shen

2009

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

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Based on the updated UrQMD transport model, the effect of the symmetry potential energy on the two-nucleon HBT correlation is investigated with the help of the coalescence program for constructing clusters, and the CRAB analyzing program of the two-particle HBT correlation. An obvious nonlinear dependence of the neutron-proton (or neutron-neutron) HBT correlation function (Cnp,nn) at small relative momenta on the stiffness factor γ of the symmetry potential energy is found: when γ 0.8, Cnp,nn increases rapidly with increasing γ, while it starts to saturate if γ 0.8. It is also found that both the symmetry potential energy at low densities and the conditions of constructing clusters at the late stage of the whole process influence the two-nucleon HBT correlation with the same power. density dependence of the symmetry energy, sensitive observables, HBT correlation In recent years, the isospin dependent equation of state (EoS) of both infinite and finite nuclear matter has been investigated in a deeper and broader range. Theoretically, a large amount of probes have been brought out to be sensitively affected by the isovector part of the EoS, i.e., the symmetry energy term. Based on different theories, the symmetry energy has been parameterized in different ways (please see refs. [1 − 3] for details). Among these parametrizations, E sym = S 0 u γ is often used (S 0 being the symmetry energy at the normal density, and u = ρ/ρ 0 the reduced density, while γ is the stiffness factor of the density dependence of the symmetry energy). Especially, the density dependence of the symmetry potential energy is paid much more attention since the uncertainty of the symmetry energy mainly comes from this term. Recently, with some comparisons between the results of experimental data and dynamical model IBUU, the uncertainty in the density dependence of the symmetry energy at subnormal densities is reduced into the range of γ ∼ 0.7 − 1.1, depending on the probable medium modifications of the nucleon transport [4,5] . Nevertheless, recently a quite soft symmetry energy (the corresponding γ factor is only about 0.3) was implied experimentally at very low nuclear densities (ρ N is 0.01 − 0.05 times normal density) [6] . Furthermore, in the most recent analyses by Tsang's group [7] , although they found that several different observables can provide consistent constraints on the density dependence of the symmetry energy, the constraints are still

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Isospin effects on two-nucleon correlation functions in heavy-ion collisions at intermediate energies

Cited by 51 publications

References 83 publications

Medium modifications of the nucleon–nucleon elastic cross section in neutron-rich intermediate energy HICs

Medium modifications of the nucleon–nucleon elastic cross section in neutron-rich intermediate energy HICs

Correlations and characterization of emitting sources

Difficulties in probing density dependent symmetry potential with the HBT interferometry

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