• Volume 2, Issue 5

      May 1974,   pages  229-297

    • Gravitational charges,f-gravity and hadron masses

      C Sivaram K P Sinha

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      Two types of fundamental gravitational charges are suggested by quantization of the angular momentum (i.e. J=nħ, wheren is an integer or half integer) occurring in the uncharged and charged Kerr metrics. These charges turn out to bee/√a ande/a, wheree is the unit electric charge anda the fine structure constant. The use of strong (f) gravity leads to corresponding fundamental massesM1(f) ∼2.2×10−24 g andM2(f)∼2.3×10−23 g. It is postulated that the hadrons are composed of these fundamental entities (christened oms here). Thus mesons arediomic particles and baryons aretriomic particles. This has a close resemblance to the quark model but here we deal with gravitational charges. The charges constituting hadrons are bound together by strong (f) gravity which is super strong compared to nuclear forces. Various hadron masses are obtained as the vibrational excitations of these composite units. The above model is capable of accounting for quantum numbers such as spin, baryon number, strangeness and isospin.

    • Are nuclei withN∼43 deformed?

      CK Baba S M Bharathi B Lal

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      The level schemes of75Se and79Kr have been established through gamma ray and conversion electron spectroscopy following75As (p, nγe) and79Br (p, nγe) reactions. The data on these nuclei and the nuclei in the neighbourhood of this mass region are discussed and evidence is presented to show that the nuclei withN∼43 are deformed.

    • Correlations in pp-collisions and two-component models

      B S Chaudhary V Gupta

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      Some general consequences of charge conservation inclusive sum rules for the correlation integralsfkandf0k are given. It is also pointed out that the energy dependence offkorf0k is 〈nk fork≤7 for pp-collisions and that the data suggest all thefk andf0k’s are non-zero. Further, two-component models for the charge multiplicity distribution consistent with charge conservation, are considered and compared with the data for pp-collisions.

    • Diffractive and nondiffractive components of the multiplicity distribution in pp collisions

      D S Narayan

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      Topological cross sections for diffractive and nondiffractive components in pp collisions are deduced on the basis of a dynamical model proposed earlier to explain the multiplicity distribution of charged particles. The model has an important prediction for the angular and momentum distributions of charged particles in diffractive events.

    • Shape mixing as an approximation to shell model24Ne

      S B Khadkikar D R Kulkarni S P Pandya

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      Band mixing calculations have been done for24Ne including the two degenerate prolate and oblate Hartree-Fock states and also some particle-hole excited states in the projection formalism using an interaction obtained by Preedom and Wildenthal. The energy spectrum agrees very well with the experimental results as well as the exact shell model calculations. Thus the band mixing calculations provide a good approximation to the lengthy exact shell-model calcuations. In addition they offer a physical insight into the collective nature of the nucleus as nuclear states are described in terms of only a few ‘intrinsic’ states.

    • Potential energy curves for theB2Σ andX2Σ states of scandium monoxide

      B Narasimhamurthy N Sreedhara Murthy

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      For theB2Σ andX2Σ states of scandium monoxide, the potential energy curves are constructed by the Rydberg-Klein-Rees and the Morse methods. Morse model is shown to be adequate for the (B→X) band system of ScO. The re values are found to be 1.717 Å and 1.665 Å for theB andX states respectively.

    • Phonon drag resistivity of potassium

      Manashi Roy

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      The phonon drag resistivity for potassium is calculated by solving the Boltzman equations for both the electrons and phonons as opposed to the conventional method of Ziman where the phonon equation is not considered. By an application of the Schwartz inequality we can show that the drag resistivity in the present formalism is larger than that obtained by the conventional method. We substantiate this result by numerical calculation for potassium at very low temperatures, using a realistic phonon spectrum obtained from inelastic neutron scattering data.

    • Ionic conductivity and anion diffusion in single crystals of lead chloride

      A K Pansare A V Patankar

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      The ionic conductivity and self-diffusion of chlorine ions in undoped single crystals of zone-refined lead chloride have been measured over the temperature range 625–370K. These measurements suggest that the conductivity and self-diffusion are due to simple vacancy migration as confirmed by the observed correlation factor. The activation energy of formation of vacancies is found to be 1.55 eV and that for migration of an anion is 0.38 eV. In the extrinsic region, the two measurements show marked discrepancies which are explained by assuming the presence of oxygen impurity ions in the lattice, and the mechanisms for their contribution to the observed excess conductivity are discussed.

    • X-ray spectroscopic study of zirconium and molybdenum diselenides

      V G Bhide B A Patki

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      The K absorption spectra of zirconium, molybdenum and selenium in ZrSe2 and MoSe2 have been recorded photographically using a Cauchois type bent crystal (mica) spectrograph. The absorption edge shifts are used along with the data for NbSe2 (Bhide and Bahl 1971J. Phys. Chem. Solids32 1001) to propose bond schemes for these compounds.

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