Jun 21 – 26, 2015
Dipartimento di Fisica ed Astronomia, Università di Catania
Europe/Rome timezone
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In-medium and isospin effects of strange particles in heavy-ion

Jun 22, 2015, 4:25 PM
20m
INFN-LNS, Sala conferenze (INFN-Laboratori Nazionali del Sud)

INFN-LNS, Sala conferenze

INFN-Laboratori Nazionali del Sud

Oral presentation Equation of State of Neutron-Rich Nuclear Matter, Clusters in Nuclei and Nuclear Reactions Equation of State of Neutron-Rich Nuclear Matter, Clusters in Nuclei and Nuclear Reactions

Speaker

Dr Zhaoqing Feng (Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou , China)

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Dynamics of strange particles produced in proton induced nuclear reactions and in heavy-ion collisions near threshold energies has been investigated within the Lanzhou quantum molecular dynamics (LQMD) transport model[1]. The in-medium modifications on particle production in dense nuclear matter are considered through corrections on the elementary cross sections via the effective mass and the mean-field potentials. A repulsive kaon-nucleon potential is implemented in the model through fitting the flow data and inclusive spectra in heavy-ion collisions, which enhances the energetic kaon emission squeezed out in the reaction zone and leads to a variation of the high-momentum spectrum of the K0/K+ yields. It is found that the stiffness of nuclear symmetry energy plays a significant role on the isospin ratio with decreasing the incident energy and a hard symmetry energy has a larger value of the K0/K+ ratio in the domain of subthreshold energies. The attractive antikaon-nucleon potential enhances the subthresholdK production and also influences the structure of inclusive spectra. The strangeness production is strongly suppressed in proton induced reactions in comparison to heavy-ion collisions. The kaon-nucleon and antikaon-nucleon potentials change the structures of rapidity and transverse momentum distributions, and also the inclusive spectra[2]. The measured data from KaoS collaboration have been well explained with inclusion of the in-medium potentials.

[1] Z. Q. Feng, Phys. Rev. C 83, 067604 (2011); 84, 024610 (2011); 85, 014604 (2012); Nucl. Phys. A 878, 3 (2012); Phys. Lett. B 707, 83 (2012).
[2] Z. Q. Feng, Phys. Rev. C 87, 064605 (2013); Z. Q. Feng, Wen-Jie Xie, Gen-Ming Jin, 90, 064604 (2014).

Primary author

Dr Zhaoqing Feng (Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou , China)

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