P. Arumugam

Nuclear reaction studies of unstable nuclei using relativistic mean field formalisms in conjunction with the Glauber model

We study nuclear reaction cross sections for stable and unstable projectiles and targets within Glauber model, using densities obtained from various relativistic mean-field formalisms. The calculated cross sections are compared with the experimental data in some specific cases. We also evaluate the differential scattering cross sections at several incident energies and observe that the results found from various densities are similar at smaller scattering angles, whereas a systematic deviation is noticed at large angles. In general, these results agree fairly well with the experimental data.

Versatility of field theory motivated nuclear effective Lagrangian approach

Abstract We analyze the results for infinite nuclear and neutron matter using the standard relativistic mean field model and its recent effective field theory motivated generalization. For the first time, we show quantitatively that the inclusion in the effective theory of vector meson self-interactions and scalar–vector cross-interactions explains naturally the recent experimental observations of the softness of the nuclear equation of state, without losing the advantages of the standard relativistic model for finite nuclei.

Reaction cross-sections for light nuclei on 12C using relativistic mean field formalism

The reaction cross-sections are calculated for various Li, Be and B+12C systems, also involving the exotic halo nuclei, by using both the spherical and deformed relativistic mean field (RMF) densities in the finite range Glauber model with Coulomb effects included. For reactions at higher energies (>500 MeV/nucleon), both the spherical and deformed RMF densities give similar results for all the isotopic chains of exotic nuclei studied here. On the other hand, for reactions between stable nuclei, though the two RMF densities (spherical and deformed) result in simply an overall normalization for the excitation functions, it gives an improved comparison with experimental data, at high and low energies for spherical and deformed densities, respectively. A similar normalization is obtained for other densities, which means to stress that, though densities are different, they do not change much with the excitation energy. Finally, some details of the characteristic properies of exotic light nuclei are shown to contain the deformation effects of the halo nuclei.

Giant dipole resonance with exact treatment of thermal fluctuations

The shape fluctuations due to thermal effects in the giant dipole resonance (GDR) observables are calculated using the exact free energies evaluated at fixed spin and temperature. The results obtained are compared with Landau theory calculations done by parameterizing the free energy. The Landau theory is found to be insufficient when the shell effects are dominating.

Effects of thermal shape fluctuations and pairing fluctuations on the giant dipole resonance in warm nuclei

Apart from the higher limits of isospin and temperature, the properties of atomic nuclei are intriguing and less explored at the limits of lowest but finite temperatures. At very low temperatures there is a strong interplay between the shell (quantal fluctuations), statistical (thermal fluctuations), and residual pairing effects as evidenced from the studies on giant dipole resonance (GDR). In our recent work [Phys. Rev. C \textbf{90}, 044308 (2014)], we have outlined some of our results from a theoretical approach for such warm nuclei where all these effects are incorporated along within the thermal shape fluctuation model (TSFM) extended to include the fluctuations in the pairing field. In this article, we present the complete formalism based on the microscopic-macroscopic approach for determining the deformation energies and a macroscopic approach which links the deformation to GDR observables. We discuss our results for the nuclei

Pairing effect in the thermal shape-fluctuation model on the width of the giant dipole resonance

^{97}

Role of higher order couplings in the presence of kaons in relativistic mean field description of neutron stars

Tc,

NUCLEAR SUB-STRUCTURE IN 112–122Ba NUCLEI WITHIN RELATIVISTIC MEAN FIELD THEORY

^{120}

Applicability of shape parameterizations for giant dipole resonance in warm and rapidly rotating nuclei

Sn,

Shape change in Hf, W and Os-isotopes: A non-relativistic Hartree-Fock versus relativistic Hartree approximation

^{179}