Using Light Charged Particles to Probe the Asymmetry Dependence of the Nuclear Caloric Curve

Abstract

Recently, we observed a clear dependence of the nuclear caloric curve on neutron-proton asymmetry $\frac{N-Z}{A}$ through examination of fully reconstructed equilibrated quasi-projectile sources produced in heavy ion collisions at E/A = 35 MeV. In the present work, we extend our analysis using multiple light charged particle probes of the temperature. Temperatures are extracted with five distinct probes using a kinetic thermometer approach. Additionally, temperatures are extracted using two probes within a chemical thermometer approach (Albergo method). All seven measurements show a significant linear dependence of the source temperature on the source asymmetry. For the kinetic thermometer, the strength of the asymmetry dependence varies with the probe particle species in a way which is consistent with an average emission-time ordering.

7 pages, 4 figures

References in corpus (7)

• Theory of Core-Collapse Supernovae
• Isotopic Dependence of the Nuclear Caloric Curve
• Density and Temperature of Fermions from Quantum Fluctuations
• Constraining the Symmetry Term in the Nuclear Equation of State at Sub-Saturation Densities and Finite Temperatures
• Asymmetry Dependence of the Nuclear Caloric Curve
• N/Z Dependence of Projectile Fragmentation
• Experimental determination of the quasi-projectile mass with measured neutrons

Cited by in corpus (6)

• The equation of state and symmetry energy of low density nuclear matter
• Critical parameters of liquid-gas phase transition in thermal symmetric and asymmetric nuclear matter
• Coulomb corrections to density and temperature of bosons in heavy ion collisions
• Coulomb corrections to density and temperature in heavy ion collisions
• Experimental study of the ${}^{40,48}$Ca+ ${}^{40,48}$Ca reactions at 35 MeV/nucleon
• Critical Scaling of Two-component Systems from Quantum Fluctuations