• Volume 2, Issue 2

      February 1974,   pages  51-106

    • Fluctuation power spectrum of a Josephson junction

      A C Biswas I Rama Rao

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      The fluctuation power spectrum of the Josephson junction has been evaluated in the limit of large energy barriers [(UnmaxUnmin)γ]≫1 and small currents [xxe]. The result is valid for finite capacitance of the junction. The effect of the fluctuating Josephson current on the voltageV(t) across the junction has also been taken into account.

    • Radial correlation in atoms

      A Mukherji

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      A method is described to calculate correlation energy in atoms. The total wavefunction of ann-electron system is expressed as a linear combination of products ofn one-electron basis orbitals. This function gives a correlated description of the system. Under suitable restrictions it reduces to DODS and to splitshell description of closed-shell atoms or molecules. Energies of He atom, He-like ions and also of H ion have been calculated including radial correlation only. The calculated electron affinity of H is better than earlier split-shell calculations. The result for He shows that the energy limit for radial correlation has been attained. For the other 2-electron ions radial correlation alone explains about one-third of the total correlation.

    • Analysis of the neutral-current interaction in the inclusive neutrino reactions

      G Rajasekaran K V L Sarma

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      We attempt a general phenomenological analysis of the neutral weak current in the inclusive neutrino reactions using the parton model as a tool. From the recently reported data on these processes we determine the strengthH of the neutral-current interaction as well as the amount of theVA interference. We find (H/G)2=0·54±0·06 whereG is the Fermi coupling constant and theVA interference contribution turns out to be 33±23%. We also discuss the comparison of the data with various models for the neutral hadronic current.

    • A model for the multiplicity distribution in pp-collisions from 5 to 300 GeV/c

      B S Chaudhary V Gupta D S Narayan

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      The multiplicity distribution of charged particles in pp-collisions in the range 5–300 GeV/c is explained on the basis of a dynamical model which leads to a specific mixture of Poisson distributions.

    • Comments on the high energy behaviour of total cross-sections based on light-cone algebra

      T Das L K Pandit Probir Roy

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      Based on considerations of the light-cone algebra of currents and pseudoscalar densities, it is suggested that either the high energy meson-nucleon cross-sections are constants (even though the pp-cross-section increases indefinitely) or that they deviate from constancy by logarithmic terms whose scale is set by a mass, of the order of at least tens of Gev, and which also characterises the consequent logarithmic violations of Bjorken scaling.

    • 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.

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