scholarly journals Effects of the kinetic symmetry energy reduced by short-range correlations in heavy-ion collisions at intermediate energies

2015 ◽  
Vol 91 (4) ◽  
Author(s):  
Bao-An Li ◽  
Wen-Jun Guo ◽  
Zhaozhong Shi
Keyword(s):  
Symmetry Energy ◽  
Heavy Ion Collisions ◽  
Short Range ◽  
Heavy Ion ◽  
Intermediate Energies ◽  
Ion Collisions ◽  
Short Range Correlations

CORRELATED NUCLEON EMISSION IN PERIPHERAL RELATIVISTIC HEAVY ION COLLISIONS

1993 ◽  
Vol 08 (13) ◽  
pp. 2287-2296
Author(s):  
L. L. BARZ ◽  
A. F. R. de TOLEDO PIZA
Keyword(s):  
Cross Section ◽  
Born Approximation ◽  
Heavy Ion Collisions ◽  
Short Range ◽  
Heavy Ion ◽  
Relativistic Heavy Ion Collisions ◽  
Final States ◽  
Ion Collisions ◽  
Nucleon Emission ◽  
Short Range Correlations

The effects of short range correlations for two nucleon emission in peripheral relativistic heavy ion collisions are investigated. The cross section is calculated in Born approximation with properly orthogonalized initial and final states.

scholarly journals Quantifying the Effect of Initial Fluctuations on Isospin-Sensitive Observables from Heavy-Ion Collisions at Intermediate Energies

Symmetry ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 2172
Author(s):  
Yongjia Wang ◽  
Zepeng Gao ◽  
Qingfeng Li
Keyword(s):  
Symmetry Energy ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Yield Ratio ◽  
Quantum Molecular Dynamics ◽  
Intermediate Energies ◽  
Ion Collisions ◽  
Protons And Neutrons ◽  
Charged Pions ◽  
Sensitive Observables

Initial fluctuation is one of the ingredients that washes fingerprints of the nuclear symmetry energy on observables in heavy-ion collisions. By artificially using the same initial nuclei in all collision events, the effect of the initial fluctuation on isospin-sensitive observables, e.g., the yield ratio of free neutrons with respect to protons Nn/Np, 3H/3He yield ratio, the yield ratio between charged pions π−/π+, and the elliptic flow ratio or difference between free neutrons and protons v2n/v2p (v2n-v2p), are studied within the ultrarelativistic quantum molecular dynamics (UrQMD) model. In practice, Au + Au collisions with impact parameter b = 5 fm and beam energy Elab = 400 MeV/nucleon are calculated. It is found that the effect of the initialization on the yields of free protons and neutrons is small, while for the yield of pions, the directed and elliptic flows are found to be apparently influenced by the choice of initialization because of the strong memory effects. Regarding the isospin-sensitive observables, the effect of the initialization on Nn/Np and 3H/3He is negligible, while π−/π+ and v2n/v2p (v2n-v2p) display a distinct difference among different initializations. The fingerprints of symmetry energy on π−/π+ and v2n/v2p can be either enhanced or reduced when different initializations are utilized.

Isospin effects on pt-differential flow in heavy ion collisions at intermediate energies

2014 ◽  
Vol 23 (10) ◽  
pp. 1450062
Author(s):  
Rubina Bansal ◽  
Anupriya Jain ◽  
Suneel Kumar
Keyword(s):  
Density Dependence ◽  
Symmetry Energy ◽  
Heavy Ion Collisions ◽  
Dominant Role ◽  
Heavy Ion ◽  
Nucleon Nucleon ◽  
Transverse Flow ◽  
Intermediate Energies ◽  
Ion Collisions ◽  
Isospin Dependence

This paper aims to study the role of isospin degree of freedom in heavy-ion collisions through the transverse momentum (pt), neutron to proton ratio and system mass dependence of pt-differential transverse flow. Our study shows that (pt)-differential transverse flow dependence can act as sensitive probe to study symmetry energy and its density dependence compared to the energy of vanishing flow. Symmetry energy and its density dependence play a dominant role over the isospin-dependence of nucleon–nucleon cross-section at Fermi energy.

SHORT RANGE CORRELATIONS AND NUCLEON EMISSION IN PERIPHERAL RELATIVISTIC HEAVY ION COLLISIONS

1989 ◽  
Vol 04 (14) ◽  
pp. 1315-1328 ◽  
Author(s):  
C.A. BERTULANI ◽  
L.F. CANTO ◽  
R. DONANGELO ◽  
J.O. RASMUSSEN
Keyword(s):  
Cross Sections ◽  
Heavy Ion Collisions ◽  
Short Range ◽  
Heavy Ion ◽  
Momentum Conservation ◽  
Relativistic Heavy Ion Collisions ◽  
Ion Collisions ◽  
Nucleon Emission ◽  
Short Range Correlations ◽  
Phonon Absorption

We investigate the effects of short range correlations on nucleon emission in peripheral relativistic heavy ion collisions, following an idea originally proposed by Feshbach and Zabek. Expressions for one- and two-nucleon emission cross sections are derived and calculations for typical heavy ion systems are performed. We show that momentum conservation in the phonon absorption process leads to pronounced ridges in the quadruple-differential cross section for two-nucleon emission. We suggest that the presence of such ridges in future exclusive experiments should be considered as a signature of correlated emission of a nucleon pair.

scholarly journals Symmetry energy dependence of light fragment production in heavy-ion collisions

2015 ◽  
Vol 88 ◽  
pp. 00021
Author(s):  
H. H. Wolter ◽  
M. Zielinska-Pfabe ◽  
P. Decowski ◽  
M. Colonna
Keyword(s):  
Energy Dependence ◽  
Symmetry Energy ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Light Fragment ◽  
Ion Collisions ◽  
Fragment Production
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