• K H Bhatt

      Articles written in Pramana – Journal of Physics

    • Intrashell quartet excited states

      A K Dhar D R Kulkarni K H Bhatt

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      The intrashell quartet states are obtained by exciting two protons and two neutrons from the highest occupied orbital to the lowest unoccupied orbital of the lowest Hartree-Fock solutions for some even-even (N=Z) nuclei in the ds and fp shells. These intrinsic quartet states are found to be very high in energy. The states with good angular momenta are obtained by diagonalizing the Hamiltonian matrix constructed in the basis of the states projected from the lowest prolate and oblate HF states and the quartet excited intrinsic states with proper care of the non-orthogonality of these states. It was observed that for20Ne both the projection as well as the orthogonalization procedures significantly change the energy separations of the original intrinsic states and the low lying excited states do not have a well-defined quartet structure. The excited states of24Mg and28Si which seem to have dominant quartet structure lie very high up in energy. In contrast to these nuclei, quartet excited states are not likely to provide a reasonable description of the eigenstates of the fp shell nuclei44Ti,48Cr and52Fe.

    • The deformation producing tendency of (d3/2f7/2) empirical effective interaction

      D P Ahalpara K H Bhatt

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      The effective matrix elements in (d3/2f7/2)2 configuration have been recently defined by Erskineet al. and Sherret al. assuming shell clcsures for S32 and Ca40. We have attempted to verify whether this empirically deduced (d3/2f7/2)2 interaction permits thed3/2 shell to remain closed when nucleons are added to Ca40. It is found that the Erskine interaction gives rise to ground states of thef7/2 shell nuclei in which thed3/2 orbit is completely filled. However that interaction over-binds Ca40. If the centroid of the (d3/2)2 interaction is modified to fit the Ca40 binding energy, the ground states of Cr48 and Fe52 become deformed and thed3/2 orbit is not completely filled.

    • Shell model spectra of92Tc and93Ru

      D P Ahalpara K H Bhatt

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      Shell model calculations for the nuclei91Mo,92Tc and93Ru in the Talmi approach have been done. The ground state binding energies and the excitation spectra agree with experiment.

    • Enhanced isospin dependence of the empirical particle-hole effective interaction

      D P Ahalpara K H Bhatt

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      The separation betweenT=0 andT=1 centroids of the empirical effective interaction is fairly large for the (d32/−1f7/2)JT particle-hole interaction as compared to nearby (f7/2)2JT and (d5/2)2JT particle-particle interactions. This interesting feature of the empirical effective interaction is shown to arise as a consequence of renormalization of the effective interaction as one truncates the configuration space from (sd)−1(fp)1 to (d32/−1f7/2) and from (fp)2 and (sd)2 configurations to (f7/2)2 and (d5/2)2 respectively.

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