scholarly journals Modifications of the pion-production threshold in the nuclear medium in heavy ion collisions and the nuclear symmetry energy

2015 ◽  
Vol 91 (1) ◽  
Author(s):  
Taesoo Song ◽  
Che Ming Ko
Keyword(s):  
Symmetry Energy ◽  
Heavy Ion Collisions ◽  
Pion Production ◽  
Heavy Ion ◽  
Nuclear Medium ◽  
Nuclear Symmetry Energy ◽  
Production Threshold ◽  
Pion Production Threshold ◽  
Ion Collisions

scholarly journals MEDIUM EFFECTS ON CHARGED PION RATIO IN HEAVY ION COLLISIONS

2010 ◽  
Vol 19 (08n09) ◽  
pp. 1763-1772 ◽  
Author(s):  
CHE MING KO ◽  
YONGSEOK OH ◽  
JUN XU
Keyword(s):  
Nuclear Matter ◽  
Symmetry Energy ◽  
Heavy Ion Collisions ◽  
Wave Interaction ◽  
Heavy Ion ◽  
Nuclear Medium ◽  
Nuclear Symmetry Energy ◽  
Ion Collisions ◽  
Charged Pions ◽  
Positively Charged

We have recently studied in the delta-resonance–nucleon-hole model the dependence of the pion spectral function in hot dense asymmetric nuclear matter on the charge of the pion due to the pion p-wave interaction in nuclear medium. In a thermal model, this isospin-dependent effect enhances the ratio of negatively charged to positively charged pions in neutron-rich nuclear matter, and the effect is comparable to that due to the uncertainties in the theoretically predicted stiffness of nuclear symmetry energy at high densities. This effect is, however, reversed if we also take into account the s-wave interaction of the pion in nuclear medium as given by chiral perturbation theory, resulting instead in a slightly reduced ratio of negatively charged to positively charged pions. Relevance of our results to the determination of the nuclear symmetry energy from the ratio of negatively to positively charged pions produced in heavy ion collisions is discussed.

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