• M R Gunye

      Articles written in Pramana – Journal of Physics

    • Back-bending in182,184,186osmium

      M R Gunye Ashok Kumar

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      The high spin yrast states uptoJ=22+ in182,184,186Os are studied in a microscopic variational approach with number-conserved projected states. The energy spectra, quadrupole, moments andB (E2) values are calculated by employing the Hamiltonian with quadrupole plus pairing interactions. The results of the calculations are in fair agreement with the available experimental data.

    • Imploding shocks in laser-driven fusion

      S V Lawande M R Gunye S V G Menon

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      The role of a sequence of imploding spherical and cylindrical shocks is investigated in the context of laser-driven fusion in deuterium-tritium pellets. An approximate analytical treatment of a convergent sequence of shocks is presented within the framework of gas-dynamic equations for self-similar motion. These analytical solutions are compared with the exact numerical solutions. The solutions display an explicit dependence on the relative strength between the successive shocks and the ratio of the final to the initial pressure in the shocks. These solutions are employed to estimate the fusion yield for a given input shock energy.

    • High spin yrast states in even platinum isotopes

      Ashok Kumar M R Gunye

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      The high spin yrast states up toJ=20+ in184, 186Pt and190, 192, 194Pt are studied in a microscopic approach of variation with number-conserved projected states. The energy spectra, quadrupole moments andB(E2) values are calculated by employing the Hamiltonian with quadrupole plus pairing interactions. The results of the calculations are in fair agreement with the available experimental data.

    • Microscopic band-mixing calculations in154,156Gd

      S V Moholkar C S Warke M R Gunye

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      A many-body microscopic band-mixing formulation of variation after projection of angular momentum and conservation of nucleon number is used to study the yrast band and first excitedKπ=0+ band in the doubly even nuclei154,156Gd. The computed energy spectra and the interband and intra-band B (E2) values are in good agreement with corresponding experimental data. Connection with the phenomenological model of Stephens and Simon is discussed, bringing out the role played by thei13/2 neutron pair in the microscopic formalism.

    • Microscopic study of odd-A nuclei

      S V Moholkar C S Warke M R Gunye

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      The odd-proton nucleus155Tb and odd-neutron nucleus155Dy are studied along with doubly-even nucleus156Dy using microscopic method of variation after projection of angular momentum and conservation of nucleon number in each projected state. The calculated energies of the ground band in156Dy and the ground and excited bands in155Dy and155Tb are in good agreement with the corresponding experimental data. The role played by thei13/2 neutron pair in these nuclei is discussed.

    • The quadrupole plus pairing interaction model in large configuration space for W, Os and Pt nuclei

      Ashok Kumar M R Gunye

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      The equilibrium deformations of tungsten, osmium and platinum nuclei are studied with the self-consistent quadrupole plus pairing interaction model by considering all the nucleons in nucleus explicitly. It is shown that similar results can be obtained by performing calculations with or without the assumption of an inert core. The only difference is in the strength of the quadrupole and pairing interactions to be employed in the respective calculations. The experimental static quadrupole moments and theB (E2) values are correctly reproduced by performing calculations with bare nucleon charge for all the nucleons.

    • Side-bands in170Yb

      S V Moholkar C S Warke M R Gunye

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      The energy spectra of the even-parity (Kπ = 2+, 3+) and odd-parity (Kπ = 3, 4) side-bands in the doubly even nucleus170Yb are studied in the framework of the microscopic method of variation after angular momentum projection with nucleon number conservation in each projected state. The calculated energy spectra of the ground band and the four side bands in170Yb are in good agreement with the corresponding experimental results.

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