S. K. Samaddar

Thermostatic properties of finite and infinite nuclear systems

Abstract From a constructed finite-range momentum- and density-dependent effective interaction, we arrive at the equation of state for infinite nuclear matter. This interaction reproduces ground-state properties of finite nuclear systems; in addition it gives a proper energy dependence of the single-particle potential. For symmetric and asymmetric hot nuclear matter, we find the critical and phase-separation temperature, the specific heats, incompressibility and variations of effective mass with temperature and density. For finite nuclei, we also find the limiting temperature, i.e. the maximum temperature that such nuclear systems can sustain.

Determining the density content of symmetry energy and neutron skin: an empirical approach.

The density dependence of nuclear symmetry energy remains poorly constrained. Starting from precise empirical values of the nuclear volume and surface symmetry energy coefficients and the nuclear saturation density, we show how in the ambit of microscopic calculations with different energy density functionals, the value of the symmetry energy slope parameter L along with that for neutron skin can be put in tighter bounds. The value of L is found to be L=64±5  MeV. For 208Pb, the neutron skin thickness comes out to be 0.188±0.014  fm. Knowing L, the method can be applied to predict neutron skin thicknesses of other nuclei.

Nuclear shape transition at finite temperature in a relativistic mean field approach

The relativistic Hartree-BCS theory is applied to study the temperature dependence of nuclear shape and pairing gap for

The role of asymmetry on critical and limiting temperature

{}^{166}\mathrm{Er}

Excitation energy dependence of the symmetry energy of finite nuclei

and

The effect of flow on nuclear multifragmentation in a quantum statistical model

{}^{170}\mathrm{Er}.

Shape transition in some rare earth nuclei in relativistic mean field theory

For both the nuclei, we find that as temperature increases the pairing gap vanishes leading to phase transition from superfluid to normal phase as is observed in nonrelativistic calculation. The deformation evolves from prolate shapes to spherical shapes at

Sensitivity of elements of the symmetry energy of nuclear matter to the properties of neutron-rich systems

T\ensuremath{\sim}2.7

Equation of state of nuclear matter from empirical constraints

MeV. Comparison of our results for heat capacity with the ones obtained in the nonrelativistic mean field framework indicates that in the relativistic mean field theory the shape transition occurs at a temperature about 0.9 MeV higher and is relatively weaker. The effect of thermal shape fluctuations on the temperature dependence of deformation is also studied. Relevant results for the level density parameter are further presented.

Constraining the density dependence of the symmetry energy from nuclear masses

Abstract The critical temperature of infinite nuclear systems and the limiting temperature of finite nuclear systems are found to be strongly sensitive to neutron-proton asymmetry.