A model for the three lepton decay mode of the proton

An extension of the left-right symmetric model has been constructed which gives in a natural way the three lepton decay modes of the proton which have been suggested as an explanation for the atmospheric neutrino anomaly. We write down the potential which after minimization gives the proper choice of the Higgs spectrum. With this Higgs spectrum we then study the evolution of the gauge coupling constants and point out that for consistency one has to include effects of gravity.     

A quasi random search technique for functional fitting of detector responses

The problem of nonlinear optimization is encountered while fitting the observed response of certain radiation detectors. In this paper the development of an optimizing technique based on quasi random search is described. The performance of this technique is compared with other existing methods of gradient search and linear Taylor differential correction technique in the case of fitting the photopeak responses of Nal(Tl) detectors. Our results are favourable especially when the observed data are associated with poor statistics.     

Use of threshold activation technique in estimating energy distributions of accelerator produced neutrons

A study of effective implementation of threshold activation technique for neutron spectral analysis in the environment of an alpha-cyclotron target is presented. The activation data are analysed using LOUHI-82 code. Optimal choices of the regularization parameters of the code are studied and discussed. Energy distribution of neutrons emitted from thick targets of Be, C and Ta irradiated by 40–45 MeV alphas is discussed.     

Acetylacetone complexes of tetravalent molybdenum

Some new complexes of tetravalent molybdenum containing acetylacetone have been synthesized by the reaction of acetylacetone with hydrated molybdenum(IV) oxide. Two series of complexes having varied coordination linkages for acetylacetone have been isolated under appropriate conditions. All the compounds were characterized through their elemental analyses, spectral data, magnetic moment and conductance measurement.     

On microbending loss calculations in single mode fibers with arbitrary index profiles

We present an analytical method to evaluate the auxiliary function and spot sizes determining microbending loss in single mode fibers with arbitrary refractive index profiles. Comparison with the exact numerical results shows that the present method gives very accurate results for spot sizes. The method is simple and requires relatively less computational effort.     

Heating due to the 9.6μm ozone band in an inhomogeneous atmosphere—a new approximation

The Curtis-Godson method when applied to the 9.6μm ozone band yields large errors. Kuriyan et al. suggested a method improving this result and yet retaining the analytic simplicity of the transmission function. In this paper, the analytic form of the derivative of the transmission function is obtained and then the heating rates are calculated with the new approximation. The errors in this case are negligibly small. Algebraic manipulation enables the reduction of this approximation to a form similar to that proposed by Goody. This procedure permits interpretation of the boundary conditions in physical terms.     

Finite quantum field theory and neutrinodynamics

In quantum neutrinodynamics (photon-neutrino weak coupling) all the renormalization constants vanish and therefore the field equations cannot be expressed in terms of unrenormalized field quantities. This helps us to formulate quantum neutrinodynamics as a convergent quantum field theory. It is also pointed out that from the viewpoint of the unified model of weak and electromagnetic interaction as developed on the basis of the photon-neutrino weak coupling by Bandyopadhyay, quantum electrodynamics also manifests itself as a convergent field theory.     

Rhenium. Part XVI. Ammine and pyridine compounds of zinc and cadmium containing coordinated perrhenate

Summary [Zn(NH₃)₄](ReO₄)₂ and [Cd(NH₃)₄](ReO₄)₂ have been prepared from M(ReO₄)₂ and aqueous ammonia. The tetrapyridine compounds [Zn(py)₄(ReO₄)₂] and [Cd(py)₄(ReO₄)₂] have been obtained by reacting M(NO₃)₂ with aqueous pyridine followed by the addition of HReO₄. Pyrolysis of these complexes gives [Zn(NH₃)₂(ReO₄)₂], [Cd(NH₃)₂(ReO₄)₂], [Zn(py)₂(ReO₄)₂] and [Cd(py)₂(ReO₄)₂] respectively. The kinetics of the decomposition steps: [ML₄(ReO₄)₂] [ML₂(ReO₄)₂] M(ReO₄)₂ have been studied from the t.g.a. curves. I.r. and Raman spectral and x-ray powder diffraction studies indicate that all the pyridine complexes and the two diammine complexes contain coordinated perrhenate, while the two tetrammine complexes contain ionic perrhenate.