New approach to solving the problem of composite-particle scattering on nuclei

An essentially new approach to solving the problem of elastic and inelastic scattering of a composite particle on stable nuclei is described. Within this approach, all channels of virtual breakup and stripping in the intermediate states are included in a nonlocal complex-valued interaction operator with the aid of the projection-operator technique.The three-particle continuum spectrum of the Hamiltonian for intermediate states in Q space is calculated within the orthogonalizing-pseudopotential method by introducing a pseudo-Hamiltonian, which is diagonalized in a full space in terms of a relevant oscillator basis. As was shown by a number of authors, the use of special quadratures makes it possible to reduce integration over the continuous spectrum of intermediate states to summation over a discretized continuum. On the basis of the formalism developed in this study, a closed Schrödinger equation with a nonlocal complex potential for partial waves is derived for describing elastic scattering of a composite particle by a target, and an explicit approximate formula for the amplitude of three-particle breakup is obtained on the same basis. This method has a number of obvious advantages over currently well-known approaches of the type of the discretized-continuum coupled-channel method, where solving the problem in question reduces to solving a cumbersome set of coupled equations.     

Reactions of chlorine dioxide with organic compounds. Selective oxidation of sulfides to sulfoxides by chlorine dioxide

A novel method for the selective oxidation of various types of sulfides to sulfoxides using chlorine dioxide as the oxidant is proposed.     

Oxidative transformations of alkyl caryophyllanyl sulfides

Sesquiterpene sulfoxides and sulfones were synthesized in up to 56 and 74% yields, respectively. The oxidation of sulfides was accompanied by rearrangement of the epoxide fragment to allylic alcohol with subsequent oxidation. The isomerization of 4,5-epoxycaryophyllane-15-thiol afforded for the first time 4,11,11-trimethyl-8-(sulfanylmethyl)bicyclo[7.2.0]undec-3-en-5-ol in 40–45% yield.     

Synthesis of New Sulfonamides Based on β-Pinene

Russian Journal of Organic Chemistry - Reactions of pinane-10-sulfonyl chlorides with alkyl-, aryl-, and hetarylamines afforded up to 92% of new chiral sulfonamides that are potentially...     

Dependence of Properties of Variable Gradient Porous Structures of Silicon on the Method of Formation

Physics of the Solid State - A series of samples of gradient-porous silicon structures with crystallographic orientations (100) and (111) by deep anode etching was obtained. Dependences of the rate...     

Reactions of caryophyllene oxide with ethane-1,2-dithiol and 2-sulfanylethanol catalyzed by Lewis acids

Russian Journal of Organic Chemistry - Reactions of caryophyllene oxide with ethane-1,2-dithiol and 2-sulfanylethanol in the presence of Lewis acids (BF3 · Et2O and ZnCl2) as catalyst afforded...     

DNA microarrays on porous membrane supports with colorimetric detection

The technology of DNA microarrays on porous membrane supports with colorimetric detection on horseradish peroxidase was developed. Comparison of the methods of oligonucleotide immobilization on chemically different membranes was carried out and the conditions of colorimetric detection of biotin in DNA duplexes on microarray surface were optimized. The method that was developed was applied for determining the type of genes encoding extended-spectrum β lactamases.     

A new technique to measure the phase characteristics of laser mirrors based on semiconductor heterostructures

A reflection interferometer based on a thin metal film is proposed to measure the phase of the reflection spectrum of laser mirrors. The device is applied to the study of the phase characteristics of the all-semiconductor mirror which combines the functions of the saturable absorber and the dispersion compensator (all-in-one) in the Nd³⁺:KGd(WO₄)₂ laser operating in the ultrashort-pulse regime. The method provides improvement of spectral resolutions and an increase in the accuracy in the measurement of the phase characteristics.