28965135
Effect of channel coupling on spin distribution at and above Coulomb barrier energies.
The energy dependence of the fusion spin distribution has been studied in terms of its scaled moments. It is shown that the effect of channel coupling on spin distribution, particularly the effect of coupling of the shape degree of freedom to the translational motion, is much stronger at and above Coulomb barrier energies, even though the effect on fusion cross section is largest at sub-barrier energies.
119558719
Assembly, testing and production of bakelite RPCs for the end-cap region of the Compact Muon Solenoid experiment at CERN
Abstract The production of ten large area Resistive Plate Chambers (RPCs) for the end-cap region of CMS, under India-CMS-RPC Collaboration—“Action Plan (Phase-I)”, is in progress at the Nuclear Physics Division, Bhabha Atomic Research Centre, Mumbai, in active collaboration with Delhi University and Panjab University. These detectors are being assembled with gas-gaps fabricated in KODEL-Korea, mechanics from China and the FEBs from Italy. After testing and validating the series for REi/2,3, these chambers would be sent to CMS at CERN. This paper reports various pre-assembly jobs, leak tests and leakage current measurements of the gas-gaps, mechanical assembly and progress of ten RPCs under production.
15159040
Dissipative phenomena in a chemically nonequilibrated quark gluon plasma
The dissipative corrections to the hydrodynamic equations describing the evolution of energy-momentum tensor and parton densities are derived in a simple way using the scaling approximation for the expanding quark gluon plasma at finite baryon density. This procedure has been extended to study the process of chemical equilibration using a set of rate equations appropriate for a viscous quark gluon plasma. It is found that in the presence of dissipation, the temperature of the plasma evolves slower, whereas the quark and gluon fugacities evolve faster than their counterparts in the ideal case without viscosity.
44941537
Entrance-channel dependence of fission-fragment anisotropies: A direct experimental signature of fission before equilibration.
Fission-fragment angular distributions in reactions of {sup 10}B, {sup 12}C, {sup 16}O+{sup 232}Th and {sup 237}Np, and {sup 19}F+{sup 237}Np have been measured. While the measured anisotropies in B- and C-induced fission are found to be in agreement with the predictions of the standard Halpern-Strutinsky theory, they are anomalously large in the case of O- and F-induced fission. Such a discontinuous behavior in angular anisotropy with respect to the entrance-channel mass-to-charge asymmetry provides an experimental verification of the predictions of the preequilibrium fission model proposed earlier to explain the anomalous fragment angular distributions.
120756008
Supercooling in viscous hydrodynamics for QCD phase transition
First order quark hadron phase transition is considered in scaling hydrodynamics including the Csernai-Kapusta model of nucleation of hadronic bubbles leading to supercooling. The effect of viscosity on the entropy production is studied in ideal as well as in viscous hydrodynamics with and without supercooling. It is found that the excess entropy produced due to supercooling depends weakly on viscosity.
2366114
Pattern recognition of particle tracks using principal component analysis and artificial neural network
Abstract A new method is suggested for pattern recognition of particle tracks based on a combined approach of both artificial neural network (ANN) and principal component analysis (PCA). It is seen that in high multiplicity environment, neither the PCA nor the ANN method is satisfactory when used separately as a track classifier. Best performance is achieved when the data are preprocessed using PCA technique, before it is fed to the backpropagated neural network.
29905749
Polarization-dependent bending of light by the axion hair of black holes.
We study the deflection of light by the pseudoscalar "axion" hair of black holes. Because of the $P$- and $T$-violating interaction ${\mathcal{L}}_{\mathcal{I}}=\ensuremath{\lambda}\mathrm{aF}\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{F}$ between axions and photons, light signals of opposite circular polarization propagating through the axion medium will be deflected through different angles. There will be a twofold splitting of the image of the source with an angular separation which is determined by the static configuration of the axion field outside the black hole horizon and could be an unambiguous signature of axionic black holes.