• P K Chattopadhyay

      Articles written in Pramana – Journal of Physics

    • Investigation of the boundary value problem corresponding to a generalized Skyrme lagrangian

      Rajesh Kumar P K Chattopadhyay

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      A detailed numerical analysis of the boundary value problem resulting from the most general Skyrme type lagrangian containing up to quartic terms in field gradients is presented. The additional parameters in the lagrangian can be related to pion-pion scattering lengths. It is found that solutions to the boundary value problem does not exist for all values of the parameters and in particular, for the values predicted from pion-pion scattering data. Physical quantities of the nucleon are calculated for the highest possible values of the parameters admitting a solution and are compared with the corresponding values for the Skyrme model and experimental values.

    • The breaking of O(6) symmetry in 118Xe and 120Xe

      Bir Singh Rawat P K Chattopadhyay

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      The spectra of the isotopes of xenon are analysed from the point of view of O(6) symmetry breaking. It is pointed out that the excitation energies of the states 03+ can be used in detecting breaking of the symmetry. The nature of symmetry breaking in 118Xe and 120Xe is indicated.

    • Complex plasma experimental device – A test bed for studying dust vortices and other collective phenomena


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      A typical device for carrying out sophisticated and complex dusty plasma experiments is designed, fabricated and made operational at the Institute for Plasma Research, India. The device is named as complex plasma experimental device (CPED). The main aim of this multipurpose machine is to study the formation and behaviour of dust vortices in the absence of external magnetic field under the effect of various plasma parameters. Further, the device is equipped with advanced imaging diagnostics for studying many other interesting phenomena such as dust oscillations, three-dimensional crystalline structures, dust rotation, etc. The device is quite flexible to accommodate many innovative experiments. Detailed design of the device, its diagnostics capabilities and theadvanced image analysis techniques are presented in this paper.

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