• B K Nayak

      Articles written in Pramana – Journal of Physics

    • Some aspects of heavy ion fusion-fission dynamics

      D V Shetty R K Choudhury B K Nayak D M Nadkarni S S Kapoor

      More Details Abstract Fulltext PDF

      Study of heavy ion induced fusion-fission reactions at near and below barrier energies has attracted a great deal of attention in recent years, due to the observations of anomalous features in the fragment angular distributions for many target-projectile systems. Additionally there are also measurements of the fragment spin distributions and time-scales of the fusion-fission reactions, which have provided important information on the dynamics of these processes. In the present paper, the emphasis would be to highlight some of the recent experimental findings and their implications on the dynamics of the fusion-fission reactions in heavy ion collisions at near and above barrier energies.

    • The construction of shower maximising sensitive MCP detector


      More Details Abstract Fulltext PDF

      The set-up described here involves a large-area microchannel plate (MCP) detector, equipped with a 90-degree bender used to reflect the lightweight charged particles. To measure the energy of ions, ions have to be passed through the detector. The assembled MCP detector provides the signature of the detection of high-energy particles by producing a shower of secondary electrons. The MCP detector is designed and developed using areflecting mirror, supporting screws, conversion foil, a teflon base and a collimator. The passage of ions through the collimator and then from the conversion foil generates secondary electrons which are bent down by the reflectorbefore the detection. Also, the working of the MCP detector developed at BARC is tested with strontium-90 (primary electron source) and Th 232 (alpha emitter). Lower cost and low value of fall time constant (less than 2 ns) are the attractive features of the MCP. Additionally, the MCP has been used in the detection of a low-energy electron where a timing resolution of a few hundreds of picosecond to nanoseconds is desired.

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