• Amit Roy

      Articles written in Pramana – Journal of Physics

    • Alpha decay of isobaric analogue states in24Mg and28Si

      Amit Roy M L Jhingan K V Iyengar

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      Theα-decay of isobaric analogue states (which are forbidden by isospin selection rules) excited in24Mg and28Si through preton capture by23Na atEp=677 and 739 keV and by27Al atEp=295, 327 and 405 keV, respectively, have been studied using solid state track detectors. The ratio ofα-decay widths of the two resonance states in24Mg to the state at 1.632 MeV (2+) in20Ne yields the value 0.065 for the mixing parameterε and the value 4.01 keV for the Coulomb matrix element responsible for the isospin mixing in24Mg.

      In28Si the measurement of theα-decay widths of the three resonance states resulted in the determination of the proton, gamma and alpha partial widths which comprise the total width of the resonance states. Limits have been set for the value of the two mixing parameters involved in this case. Upper limits of 16 and 39 keV have been obtained for the Coulomb matrix elements responsible for the isospin mixing in28Si.

    • Superconducting linac and associated accelerator development at NSC

      Amit Roy

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      There has been significant progress in the programme to develop a superconducting linear accelerator as a booster for the Pelletron accelerator at the Nuclear Science Centre. This paper presents the current status of the development in all the major components of the accelerator.

    • Design of a superconducting low beta niobium resonator

      Prakash Potukuchi Amit Roy

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      The proposed high current injector for the superconducting Linac at the InterUniversity Accelerator Centre will have several accelerating structures, including a superconducting module which will contain low beta niobium resonators. A prototype resonator for the low beta module has been designed. The resonator has been carefully modelled to optimize the electromagnetic parameters. In order to validate them, a room-temperature copper model has been built and tested. In this paper we present details of the electromagnetic design of the low beta resonator, briefly discuss the mechanical and engineering design, and present results from the measurements on the room-temperature copper model.

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