Nuclear Matter Properties at High Densities: Squeezing Out Nuclear Matter Properties from Experimental Data

2020 ◽  
pp. 149-160
Author(s):  
Yvonne Leifels
Keyword(s):  
Experimental Data ◽  
Nuclear Matter

scholarly journals DIRECT PHOTON PRODUCTION IN d+A AND A+A COLLISIONS AT RHIC

2009 ◽  
Vol 24 (33) ◽  
pp. 2649-2658 ◽  
Author(s):  
BEN-WEI ZHANG ◽  
IVAN VITEV
Keyword(s):  
Experimental Data ◽  
Nuclear Matter ◽  
Photon Emission ◽  
Photon Production ◽  
Jet Quenching ◽  
Direct Photon ◽  
Cold Nuclear Matter ◽  
Matter Effects ◽  
Direct Photon Production ◽  
Photon Conversion

Direct photon production in minimum bias d+Cu and d+Au and central Cu+Cu and Au+Au collisions at center-of-mass energies [Formula: see text] and 200 GeV at RHIC is systematically investigated. We study the jet quenching effect, the medium-induced photon bremsstrahlung and jet-photon conversion in the hot QGP. We account for known cold nuclear matter effects, such as the isospin effect,the Cronin effect, shadowing and cold nuclear matter energy loss. It is shown that at high pT the nuclear modification factor for direct photons [Formula: see text] is dominated by cold nuclear matter effects and there is no evidence for large cross-section amplification due to medium-induced photon bremsstrahlung and jet-photon conversion in the medium. Comparison of numerical simulations to experimental data also rules out large Cronin enhancement and incoherent photon emission in the QGP but the error bars in the current experimental data cannot provide further constraints on the magnitudes of other nuclear matter effects.

scholarly journals Effects of NN potentials on p Nuclides in the A ∼100–120 region

2016 ◽  
Vol 25 (02) ◽  
pp. 1650015 ◽  
Author(s):  
C. Lahiri ◽  
S. K. Biswal ◽  
S. K. Patra
Keyword(s):  
Experimental Data ◽  
Nuclear Matter ◽  
Mean Field ◽  
Reaction Rates ◽  
Mass Region ◽  
Low Energy ◽  
Field Approach ◽  
Relativistic Mean Field ◽  
Energy Proton ◽  
Energy Formula

Microscopic optical potentials for low-energy proton reactions have been obtained by folding density dependent M3Y (DDM3Y) interaction derived from nuclear matter calculation with densities from mean field approach to study astrophysically important proton rich nuclei in mass 100–120 region. We compare [Formula: see text] factors for low-energy [Formula: see text] reactions with available experimental data and further calculate astrophysical reaction rates for [Formula: see text] and [Formula: see text] reactions. Again, we choose some nonlinear R3Y (NR3Y) interactions from relativistic mean field (RMF) calculation and folded them with corresponding RMF densities to reproduce experimental [Formula: see text]-factor values in this mass region. Finally, the effect of nonlinearity on our result is discussed.

STRUCTURE FUNCTION IN NUCLEAR MATTER IN THE NJL MODEL

2003 ◽  
Vol 18 (02n06) ◽  
pp. 384-387
Author(s):  
H. MINEO ◽  
W. BENTZ ◽  
A. W. THOMAS ◽  
N. ISHII ◽  
K. YAZAKI
Keyword(s):  
Experimental Data ◽  
Equation Of State ◽  
Structure Function ◽  
Nuclear Matter ◽  
Structure Functions ◽  
Simple Approximation ◽  
Nucleon Structure ◽  
Confinement Effects ◽  
Njl Model ◽  
Emc Effect

In this work we discuss the EMC effect on the nucleon structure functions in nuclear matter, using a simple approximation to the relativistic Faddeev description of the nucleon in the framework of the Nambu-Jona-Lasinio (NJL) model. We adopt a stable nuclear matter equation of state, calculated in the NJL model, which incorporates confinement effects phenomenologically so as to avoid unphysical thresholds for the decay into quarks. We will compare our results for the EMC ratio in nuclear matter in the NJL model with the parametrized fits to the experimental data.

THE DENSITY-DEPENDENT Av18 EFFECTIVE INTERACTION AND GROUND STATE OF CLOSED SHELL NUCLEI

2011 ◽  
Vol 20 (03) ◽  
pp. 679-703 ◽  
Author(s):  
M. MODARRES ◽  
N. RASEKHINEJAD ◽  
H. MARIJI
Keyword(s):  
Experimental Data ◽  
Nuclear Matter ◽  
Ground State ◽  
Local Density ◽  
Closed Shell ◽  
Binding Energies ◽  
Nucleon Potential ◽  
Theoretical Approaches ◽  
Closed Shell Nuclei ◽  
Body Potential

The ground state properties of light closed shell nuclei, i.e. 4He, 12C, 16O, 28Si, 32S, 40Ca and 56Ni are studied by using the channel-dependent effective two-body interactions (CDEI's). The CDEI's are generated through the lowest-order constrained variational (LOCV) calculation for asymmetric nuclear matter with the charge-dependent Av18 bare nucleon–nucleon potential. The work is performed on the harmonic oscillator basis, and the local density approximation is applied to create the relative and the center of mass dependent effective two-body potential. Unlike nuclear matter, and similar to our previous calculations with the Reid68 interaction, while the Av18 potential under binds above nuclei up J max = 2 channel, it gives ground state binding energies closer to the experimental data with respect to the Δ- Reid68 and the Reid68 potentials. There are not much difference between the results of Av18 interaction with J max = 5, and those of Reid68Day potential which has been define up to J max = 5. The different CDEI's up to J max = 5 are discussed and the results of our calculations are compared with the other theoretical approaches and experimental data. Finally, it is shown that the contributions of higher partial waves (J>2) are not very important and the two-body kinetic energy in J = 1 channel is roughly twice as that of J = 0 which is not the case for the two-body potential energy.

scholarly journals EQUATION OF STATE FOR NUCLEAR MATTER BASED ON DENSITY DEPENDENT EFFECTIVE INTERACTION

2005 ◽  
Vol 14 (05) ◽  
pp. 739-749 ◽  
Author(s):  
D. N. BASU
Keyword(s):  
Experimental Data ◽  
Equation Of State ◽  
Energy Density ◽  
Nuclear Matter ◽  
Effective Interaction ◽  
Velocity Of Sound ◽  
Density Dependent ◽  
Nuclear Incompressibility ◽  
Unified Description ◽  
Good Agreement

An interesting method of obtaining the equation of state for nuclear matter, from a density dependent M3Y interaction, by minimizing the energy per nucleon is described. The density dependence parameters of the interaction are obtained by reproducing the saturation energy per nucleon and the saturation density of spin and isospin symmetric cold infinite nuclear matter. The nuclear matter equation of state thus obtained is then used to calculate the pressure, energy density, nuclear incompressibility and velocity of sound in nuclear medium. The results obtained are in good agreement with experimental data and provide a unified description of radioactivity, scattering and nuclear matter.

scholarly journals LINEAR RESPONSE IN INFINITE NUCLEAR MATTER AS A TOOL TO REVEAL FINITE SIZE INSTABILITIES

2012 ◽  
Vol 21 (05) ◽  
pp. 1250040 ◽  
Author(s):  
A. PASTORE ◽  
K. BENNACEUR ◽  
D. DAVESNE ◽  
J. MEYER
Keyword(s):  
Experimental Data ◽  
Nuclear Matter ◽  
Linear Response ◽  
Effective Interaction ◽  
Finite Size ◽  
Effective Interactions ◽  
Zero Range ◽  
Analytical Expressions ◽  
Range Force ◽  
Rotating Nuclei

Nuclear effective interactions are often modeled by simple analytical expressions such as the Skyrme zero-range force. This effective interaction depends on a limited number of parameters that are usually fitted using experimental data obtained from doubly magic nuclei. It was recently shown that many Skyrme functionals lead to the appearance of instabilities, in particular when symmetries are broken, for example unphysical polarization of odd–even or rotating nuclei. In this paper, we show how the formalism of the linear response in infinite nuclear matter can be used to predict and avoid the regions of parameters that are responsible for these unphysical instabilities.

scholarly journals Relativistic Hartree-Bogoliubov description of deformed light nuclei

2020 ◽  
Vol 13 ◽  
pp. 1
Author(s):  
G. A. Lalazissis ◽  
D. Vretenar ◽  
P. Ring
Keyword(s):  
Experimental Data ◽  
Nuclear Matter ◽  
Ground State ◽  
Effective Interaction ◽  
Mean Field ◽  
Light Nuclei ◽  
Recent Experimental Data ◽  
Finite Range ◽  
Pairing Correlations ◽  
The Mean

The Relativistic Hartree-Bogoliubov model is applied in the analysis of ground- state properties of light nuclei with 4 < Ζ < 11. The model uses the NL3 effective interaction in the mean-field Lagrangian, and describes pairing correlations by the pairing part of the finite range Gogny interaction DIS. Neutron separation energies, quadrupole deformations, nuclear matter radii, and differences in radii of proton and neutron distributions are compared with recent experimental data.

scholarly journals The Ξ-nuclear potential constrained by recent Ξ– hypernuclei experiments

2021 ◽  
Author(s):  
Jinniu Hu ◽  
Ying Zhang ◽  
Hong Shen
Keyword(s):  
Experimental Data ◽  
Neutron Star ◽  
Binding Energy ◽  
Vector Meson ◽  
Nuclear Matter ◽  
Mean Field ◽  
Symmetric Nuclear Matter ◽  
Nuclear Potential ◽  
Coupling Strengths ◽  
Xi Hyperon

Abstract The $\Xi$-nuclear potential is investigated in the quark mean-field (QMF) model based on recent results of the $\Xi^-+^{14}\rm{N}$ ($_{\Xi^-}^{15}\rm{C}$) system. The experimental data on the binding energy of $1p$-state $\Xi^-$ hyperon in $_{\Xi^-}^{15}\rm{C}$ hypernuclei in KISO, IBUKI, E07-T011, E176-14-03-35 events are merged as $B_{\Xi^-}(1p)=1.14\pm0.11$ MeV. With this constraint, the coupling strengths between the $\omega$ vector meson and $\Xi$ hyperon are fixed in three QMF parameter sets. At the same time, the $\Xi^-$ binding energy of $1s$ state in $_{\Xi^-}^{15}\rm{C}$ is predicted as $B_{\Xi^-}(1s)=5.66\pm0.38$ MeV with the same interactions, completely consistent with the data from the KINKA and IRRAWADDY events. Finally, the $\Xi$-nuclear potential is calculated in the symmetric nuclear matter in the framework of QMF models. It is $U_{\Xi }=-11.96\pm 0.85$ MeV at nuclear saturation density, which will be essential to determine the onset density of $\Xi$ hyperon in neutron star.

Quarkonia in high energy nuclear collisions

2015 ◽  
Vol 24 (11) ◽  
pp. 1530015 ◽  
Author(s):  
Yunpeng Liu ◽  
Kai Zhou ◽  
Pengfei Zhuang
Keyword(s):  
Experimental Data ◽  
Nuclear Matter ◽  
Heavy Ion ◽  
High Energy ◽  
Nuclear Collisions ◽  
Matter Effects ◽  
Ion Collisions ◽  
Quarkonium Production ◽  
High Energy Collisions ◽  
Transport Approach

We first review the cold and hot nuclear matter effects on quarkonium production in high energy collisions, then discuss three kinds of models to describe the quarkonium suppression and regeneration: the sequential dissociation, the statistical production and the transport approach, and finally make comparisons between the models and the experimental data from heavy ion collisions at SPS, RHIC and LHC energies.

INSTABILITIES CONSTRAINT AND RELATIVISTIC MEAN FIELD PARAMETRIZATION

2011 ◽  
Vol 20 (01) ◽  
pp. 81-100 ◽  
Author(s):  
A. SULAKSONO ◽  
KASMUDIN ◽  
T. J. BÜRVENICH ◽  
P.-G. REINHARD ◽  
J. A. MARUHN
Keyword(s):  
Experimental Data ◽  
Equation Of State ◽  
Nuclear Matter ◽  
Nonlinear Term ◽  
Mean Field ◽  
Saturation Point ◽  
Relativistic Mean Field ◽  
Finite Nuclei ◽  
Two Parameter ◽  
Rmf Model

Two parameter sets (Set 1 and Set 2) of the standard relativistic mean field (RMF) model plus additional vector isoscalar nonlinear term, which are constrained by a set of criteria20 determined by symmetric nuclear matter stabilities at high densities due to longitudinal and transversal particle–hole excitation modes are investigated. In the latter parameter set, δ meson and isoscalar as well as isovector tensor contributions are included. The effects in selected finite nuclei and nuclear matter properties predicted by both parameter sets are systematically studied and compared with the ones predicted by well-known RMF parameter sets. The vector isoscalar nonlinear term addition and instability constraints have reasonably good effects in the high-density properties of the isoscalar sector of nuclear matter and certain finite nuclei properties. However, even though the δ meson and isovector tensor are included, the incompatibility with the constraints from some experimental data in certain nuclear properties at saturation point and the excessive stiffness of the isovector nuclear matter equation of state at high densities as well as the incorrect isotonic trend in binding the energies of finite nuclei are still encountered. It is shown that the problem may be remedied if we introduce additional nonlinear terms not only in the isovector but also in the isoscalar vectors.

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