The Dirac-Brueckner Approach

Brockmann, R.; Machleidt, R.

doi:10.1142/9789812817501_0002

Cited by 15 publications

(23 citation statements)

References 77 publications

(167 reference statements)

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“…How the nucleon effective masses and the NN cross sections are modified compared to their free-space values in a typical heavy-ion reaction at intermediate energies can be seen in Fig. 69 from the correlation between the average nucleon effective mass and average nucleon density (top panel), and the distribution of nucleon effective masses (bottom panel) at the instant of 10 fm/c after the contact of two 132 Sn nuclei in the IBUU04 simulations of their reactions at a beam energy of 50 MeV/A and an impact parameter of 5 fm. It is seen that the nucleon effective masses decrease with increasing density.…”

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

confidence: 99%

“…As an example, Fig. 118 shows the central baryon density (upper panel) and the average (n/p) ρ≥ρ 0 ratio (lower panel) of regions with baryon densities higher than ρ 0 in the reaction of 132 Sn+ 124 Sn at a beam energy of 400 MeV/nucleon and an impact parameter of 1 fm. These reactions will be available in future FAIR at GSI and CSR at Lanzhou.…”

Section: High Density Behavior Of the Nuclear Symmetry Energy And Thementioning

confidence: 99%

“…Since the symmetry energy in the supranormal density region changes from a soft one to a stiff one when the parameter x varies from 1 to −2, the value of (n/p) ρ≥ρ 0 becomes lower as the parameter x changes from 1 to −2. Because of the neutron-skins of the colliding nuclei, especially that of the neutronrich projectile 132 Sn, the n/p ratio on the low-density surface is much higher than that in their interior. As a result, the initial value of the quantity (n/p) ρ≥ρ 0 is only about 1.4, which is less than the average n/p ratio of 1.56 of the reaction system.…”

Section: High Density Behavior Of the Nuclear Symmetry Energy And Thementioning

confidence: 99%

“…Shown in Fig. 120 are the average (over all phase-space cells of the same density) isospin asymmetry δ as a function of density for central 132 Sn+ 124 Sn reactions at 400 and 2000 MeV/nucleon at the instants of approximately maximum compression. The overall rise of δ at low densities is mainly due to the neutron skins of the colliding nuclei and the distilled neutrons from isospin fractionation.…”

Section: High Density Behavior Of the Nuclear Symmetry Energy And Thementioning

confidence: 99%

“…Using the IBUU04 model, such study has been done recently to see whether the squeeze-out nucleons can be used to constrain the high density behavior of the nuclear symmetry energy [63]. An example is shown here for the reaction of 132 Sn+ 124 Sn at a beam energy of 400 MeV/nucleon and an impact parameter of 5 fm. In this reaction the maximal baryon density reached is about twice the normal nuclear matter density [69].…”

Section: The Neutron/proton Ratio Of Squeezed-out Nucleonsmentioning

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: High Density Behavior Of the Nuclear Symmetry Energy And Thementioning

confidence: 99%

Section: High Density Behavior Of the Nuclear Symmetry Energy And Thementioning

confidence: 99%

Section: High Density Behavior Of the Nuclear Symmetry Energy And Thementioning

confidence: 99%

Section: The Neutron/proton Ratio Of Squeezed-out Nucleonsmentioning

confidence: 99%

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

2008

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Light front quantization—A technique for relativistic and realistic nuclear physics

Miller¹

2000

Progress in Particle and Nuclear Physics

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Nucleon–nucleon effective potential in dense matter including rho-meson exchange

2002

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We obtain the RPA summed one-meson exchange potential between nucleons in symmetric nuclear matter at zero temperature, from a model which includes ρ, σ, ω and π mesons. The behavior of rho mesons inside the medium is first discussed using different schemes to extract a finite contribution from the vacuum polarization. These schemes give qualitatively different results for the in-medium rho mass. The results are discussed in connection with the non-renormalizability of the model. We next study the modified potential as density increases. In the intermediate distance range, it is qualitatively modified by matter and vacuum effects. In the long-distance range (r > 2 fm), one observes the presence of oscillations, which are not present in free-space. Features on this distance range are insensitive to the renormalization scheme.

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The Dirac-Brueckner Approach

Cited by 15 publications

References 77 publications

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

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

Light front quantization—A technique for relativistic and realistic nuclear physics

Nucleon–nucleon effective potential in dense matter including rho-meson exchange

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