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- Wednesday, April 14, 2021

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Langevin equations are employed to study the dissipative dynamics of highly excited compound nuclei undergoing fission. A microscopic model of nuclear dissipation is developed.

Space-time evolution of a dissipative fluid modeling a strongly coupled quark-gluon plasma and undergoing boost-invariant longitudinal and arbitrary transverse expansion is formulated from Israel-Stewart’s formal theory of 2nd order dissipative fluid dynamics. A computer code AZHYDRO-KOLKATA is developed to solve these equations to study the fluid properties.

J/psi suppression in nuclear collisions at SPS (E_{cm}~18 AGeV) and RHIC (E_{cm}~200 AGeV) energies is studied and its role as a quark gluon plasma diagnostic evaluated.

Radiation of thermal single photons and dileptons from relativistic heavy ion collisions at SPS (E_{cm} ~18 AGeV), RHIC (E_{cm}~200 AGeV), and LHC (E_{cm}~5500 AGeV) energies and their role as a signature of quark-hadron phase transition is studied.

The intensity interferometry of thermal photons is studied with a view to get information about the evolution of the system formed in such collisions.

Suppression of particles having large transverse momenta due to the energy loss suffered partons during their passage through quark gluon plasma, known as jet-quenching is one of the most spectacular observations at RHIC energies. First studies of radiation of high energy photons and large mass dileptons due to the passage of high energy partons through quark gluon partons are performed.

Elliptic flow of hadrons radiated from relativistic heavy ion collisions are considered to be a most reliable confirmation of the formation of a hot and dense system very early in the collision. However, the hadrons themselves leave the system at the time of freeze-out. First studies of the elliptic flow of thermal photons and dileptons are performed with a view to get direct information about the evolution of the elliptic flow and the flow of the quark gluon plasma stage of the system.

A description of the relativistic heavy ion collision is attempted in terms of scattering, radiating, and fusing partonic cascades, based on perturbative quantum chromodynamics. Energy densities, Debye screening lengths, and radiation of pre-equilibrium photons from such studies is performed.

The perturbed angular correlation between the two gamma rays is investigated in terms of the transport properties of the environment. The role of stochastic resonance in information transmission through noisy channel is being studied. Application of the coherent stochastic resonance phenomenon to separate different sizes of large DNA molecules is under investigation.

Mean field calculations are made for the properties of nuclear matter. Microscopic calculations of nuclear potentials are also made to extract the particle and cluster radioactivity lifetimes of finite nuclei.

The liquid drop mass formula is extended to estimate the binding energies of hyperons and also to predict the existence of bound hypernuclei near the drip lines.

Medium modification of production of hadrons in relativistic heavy ion collisions due to propagation of quarks and gluons through quark gluon plasma undergoing multiple collisions and radiating gluons before fragmenting is studied to understand the phenomenon of jet quenching.

Thermo-dynamical models based on both canonical and grand canonical ensembles are being developed in order to study multifragmentation in intermediate energy heavy ion collision. The model is also suitably extended for the projectile fragmentation reactions (peripheral collisions). These models are used to study the systematic features of multi-fragmentation like mass and charge distribution, isotopic distribution, multiplicity of intermediate mass fragments and others. Isospin dependence is also being investigated.