Excitation of two-neutron-halo nuclei in a continuum

Reactions induced by collisions of beams of unstable nuclei with nuclear targets are studied. Kinematically full breakup reactions are considered. A microscopic four-body model of the breakup of two-neutron-halo nuclei is formulated with allowance for special features of their structure. The model relies on the distorted-wave method and creates a basis for the spectroscopy of the continuous spectrum via a consistent analysis of various correlation cross sections.     

Selective electroreduction of dinitrogen on a rotating copper amalgam electrode

On an amalgamated rotating copper disk electrode in an alkaline methanol solution in the presence of mixed Ti(OH)₃–Mo(III) hydroxide, dinitrogen is shown to be selectively electroreduced to hydrazine in the potential range –1.6 to –1.9 V (with respect to the saturated calomel electrode).

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, Ti(OH)₃–Mo(III) –1,6+ –1,9 ( ) .

     

On the asymptotics of the solution of a system of linear equations with two small parameters

We consider the Cauchy problem for a system of two linear ordinary differential equations with two independent small parameters multiplying the derivatives. Estimates for the terms in the asymptotic expansion of the solution are obtained. Recursion formulas for the efficient computation of terms of the inner expansion are given.     

Clustering aspects of light exotic nuclei

The discovery of light nuclei with neutron halos has opened new perspectives for nuclear structure and a possibility to study genuine few-body aspects of matter. A number of borromean systems where the system is bound but where no binary subsystems are bound, are realized by nature in the context of nuclei,¹¹Li being the nucleus which has had most recent attention. Although a large number of calculations have addressed the detailed structure of the¹¹Li neutron halo, no single model has yet explained all the data presently available. This is in part due to uncertainties in then+⁹Li interaction. For⁶He, also a borromean system, where then+core interaction is known, the best three-body and reaction models succeed in reproducing the data. In the¹¹Li case, a major uncertainty concerns the effect of possible 1s intruder states.     

Couette flow of a multicomponent ionized gas

We consider equilibrium flow of a multicomponent ionized gas between two catalytic plates of infinite length, one of which moves parallel to the other with constant velocity. The results of [1] are generalized for ionized gaseous mixtures which are in local thermodynamic equilibrium. Formulas are presented for calculating the thermal flux and the effective thermal conductivity for ambipolar diffusion.Then a special ionization case is discussed.Notation A_i chemical symbol of the i-th component - W_i projection of the molar diffusive flux vector of the i-th component on the y-axis - x_i molar concentration - H_i enthalpy - m_i molecular weight - Q_s heat of the s-th reaction - K_ps(T) equilibrium constant of the s-th reaction - W_i mass formation rate of the i-th component per unit volume - Z_i charge number - e unit charge (electron charge) - E electric field intensity - distance between the plates - N number of components - v _sl stoichiometric coefficients - density - T temperature - p pressure - u projection of average velocity on y-axis - viscosity - thermal conductivity - D_ij binary diffusion coefficient - R universal gas constant - k Boltzmann constant In conclusion, the author wishes to thank G. A. Tirskii for proposing the study and for suggestions made in the course of the investigation.     

Asymptotic solution of the Navier-Stokes equations for a compressible-fluid flow in a plane channel under intensive blowing from the walls

The problem of determining the friction, heat flux, line of spreading, and longitudinal pressure gradient in the neighborhood of the central streamline is considered for the flow of a homogeneous, weightless, compressible fluid in a plane channel under intensive blowing from the walls. The asymptotic formulas obtained are compared with the results of numerical computations, and the limit of their applicability is established.Translated from Izvestiya Akademii Nauk SSSR, Mekhanika Zhidkosti i Gaza, No. 6, pp. 76–82, November–December, 1971.In conclusion, the author is grateful to G. A. Tirskii for valuable comments and interest in the research.     

Investigation of the reaction of 1-adamantyl bromomethyl ketone with azoles

The reactions of 1-adamantyl bromomethyl ketone with 1,2,4-triazole, benzotriazole, benzimidazole, 5-aminotetrazole, and 3(5)-amino-1,2,4-triazole were investigated, and the respective N-alkylation products were obtained. The optimum conditions were determined for alkylation in the presence of sodium hydride in hexamethylphosphorotriamide.Samara State University, Samara, Russia. Samara State Technical University, Samara, Russia. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 760–762, June, 1999.     

Mass spectra of trisubstituted 1,2,3,4-tetrahydro-1,5-benzodiazocin-2-ones

The mass spectra of 1,5-benzodiazocin-2-ones are characterized by multiline character due to the large number of pathways of fragmentation of the molecular ions. In a number of cases the same signal in the high m/e region corresponds to ions with different compositions. The principal fragmentation pathways were determined by high-resolution mass spectrometry. The possible structures of the fragment ions and the mechanisms of their formation are discussed. The mass spectra of model compounds were also investigated for this purpose.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, pp. 529–536, April, 1977.