Asymmetry Dependence of the Nuclear Caloric Curve

TL;DR

This study investigates how the nuclear caloric curve depends on neutron-proton asymmetry, revealing a linear relationship where increased asymmetry lowers the temperature, emphasizing the importance of full quasi-projectile reconstruction.

Contribution

It provides experimental evidence of the linear dependence of the nuclear caloric curve on asymmetry using reconstructed quasi-projectiles around mass 50.

Findings

Temperature decreases by about 1 MeV with 0.15 increase in asymmetry.

The caloric curve shows a linear dependence on asymmetry.

Full quasi-projectile reconstruction is crucial for accurate thermodynamic analysis.

Abstract

A basic feature of the nuclear equation of state is not yet understood: the dependence of the nuclear caloric curve on the neutron-proton asymmetry. Predictions of theoretical models differ on the magnitude and even the sign of this dependence. In this work, the nuclear caloric curve is examined for fully reconstructed quasi-projectiles around mass A=50. The caloric curve extracted with the momentum quadrupole fluctuation thermometer shows that the temperature varies linearly with quasi-projectile asymmetry (N-Z)/A. An increase in asymmetry of 0.15 units corresponds to a decrease in temperature on the order of 1 MeV. These results also highlight the importance of a full quasi-projectile reconstruction in the study of thermodynamic properties of hot nuclei.