# The Isospin Dependence Of The Nuclear Equation Of State Near The Critical Point

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Aldo Bonasera, Jul 06, 2015 Available from:- [Show abstract] [Hide abstract]

**ABSTRACT:**A new thermometer based on fragment momentum fluctuations is presented. This thermometer exhibited residual contamination from the collective motion of the fragments along the beam axis. For this reason, the transverse direction has been explored. Additionally, a mass dependence was observed for this thermometer. This mass dependence may be the result of the Fermi momentum of nucleons or the different properties of the fragments (binding energy, spin etc..) which might be more sensitive to different densities and temperatures of the exploding fragments. We expect some of these aspects to be smaller for protons (and/or neutrons); consequently, the proton transverse momentum fluctuations were used to investigate the temperature dependence of the source.Nuclear Physics A 03/2010; DOI:10.1016/j.nuclphysa.2010.04.013 · 2.50 Impact Factor - [Show abstract] [Hide abstract]

**ABSTRACT:**We study the effect of isospin degree of freedom on balance energy throughout the mass range between 50 and 350 for two sets of isotopic systems with N/Z = 1.16 and 1.33 as well as isobaric systems with N/Z = 1.0 and 1.4. Our findings indicate that different values of balance energy for two isobaric systems may be mainly due to the Coulomb repulsion. We also demonstrate clearly the dominance of Coulomb repulsion over symmetry energy. Comment: 5 pages, 3 figures In this version the discussion is in terms of N/Z whereas in the journal the whole discussion is in terms of N/A. The conclusions remain unaffectedPhysical Review C 07/2010; 82(1). DOI:10.1103/PhysRevC.82.014604 · 3.88 Impact Factor - [Show abstract] [Hide abstract]

**ABSTRACT:**A novel method to determine the density and temperature of a system is proposed based on quantum fluctuations typical of Fermions in the limit where the reached temperature T is small compared to the Fermi energy $\epsilon_f$ at a given density $\rho$. Quadrupole and particle multiplicity fluctuations relations are derived in terms of $\frac{T}{\epsilon_f}$. This method is valid for infinite and finite fermionic systems, in particular we apply it to heavy ion collisions using the Constrained Molecular Dynamics (CoMD) approach which includes the Fermi statistics. A preliminary comparison to available experimental data is discussed as well. We stress the differences with methods based on classical approximations. The derived 'quantum' temperatures are systematically lower than the corresponding 'classical' ones. With the proposed method we may get important informations on the Equation of State (EOS) of quantum Fermi systems to order O($\frac{T}{\epsilon_f})^3$, in particular near the Liquid-Gas (LG) phase transition and at very low densities where quantum effects are dominant.Physics Letters B 10/2010; 696(1-2). DOI:10.1016/j.physletb.2010.12.019 · 6.02 Impact Factor