Thermodynamic properties at the kinetic freeze-out in the Au plus Au and Cu plus Cu collisions at the RHIC using the Tsallis distribution

作者：Wu, Wei-Hao; Tao, Jun-Qi; Zheng, Hua^*; Zhang, Wen-Chao; Liu, Xing-Quan; Zhu, Li-Lin; Bonasera, Aldo

来源：Nuclear Science and Techniques, 2023, 34(10): 151.

DOI：10.1007/s41365-023-01307-y

• Heavy-ion collision
• Tsallis distribution
• Kinetic freeze-out
• Energy density
• Entropy density
• Particle density
• Squared speed of sound
• Pressure

The thermodynamic properties of charged particles, such as the energy density, pressure, entropy density, particle density, and squared speed of sound at the kinetic freeze-out in the Au + Au collisions from the relativistic heavy ion collider (RHIC) beam energy scan program (root s(NN) = 7.7-200 GeV) and in the Cu + Cu collisions at root s(NN) = 62.4, 200 GeV are studied using the thermodynamically consistent Tsallis distribution. The energy density, pressure, and particle density decrease monotonically with the collision energy for the same collision centrality; These properties also decrease monotonically from the central to peripheral collisions at the same collision energy. While the scaled energy density epsilon/T-4 and scaled entropy density s/T-3 demonstrate the opposite trend with the collision energy for the same collision centrality. There is a correlation between epsilon/T-4 and s/T-3 at the same centrality. In addition, the squared speed of sound was calculated to determine that all the collision energies share nearly the same value at different collision centralities.

• 单位
  四川大学; i