Theory of the scattering of pions from nuclei

A nonrelativistic quantum field theoretic formulation of pion-nucleus scattering is presented. A nonrelativistic boson-complex-target Low equation is developed, in which the coupling between the incident boson and target constituent particles is completely general. This development is then particularized to the case where the bosons are pions and the target is a nucleus of A nucleons. Special detailed attention is paid to the case where the pion-nucleon coupling is linear. The pion-nucleus Low equation is decomposed into a finite series of A terms, referred to as a spectator expansion, of which the first term involves one active particle and (A-1) spectators and the higher terms involve an increasingly larger number of active target particles. Within the framework of the nonrelativistic pion-nucleus Low equation, a formal definition of the pion-nucleus optical potential is also given.     

Untersuchung der Chlorokomplexe einiger Platinelemente mit Hilfe hochspannungsionophoretischer Methoden

Ohne ZusammenfassungDer Deutschen Forschungsgemeinschaft sei auch an dieser Stelle für die Unterstützung der Arbeit gedankt, die zusammen mit Herrn Dr. Gaigl an der Deutschen Forschungsanstalt für Lebensmittelchemie in München durchgeführt wurde.     

Giant magnetothermopower oscillations in indium: Evidence for magnetic breakdown

Large amplitude, low frequency oscillations in the transverse magnetothermopower of indium have been observed below 2.5 K for magnetic fields between 10 kG and 20 kG directed along either [010], [$\text{1}$01], or [1$\text{1}$0] crystallographic axes. The oscillations are attributed to magnetic breakdown.     

Search for B --> tau(nu) and B --> K(nu)nu

We report results of a search for B-->tau(nu) in a sample of 9.7 x 10(6) charged B meson decays. We exclusively reconstruct the companion B decay to suppress background. We set an upper limit on the branching fraction B(B-->tau(nu))<8.4 x 10(-4) at 90% confidence level. We also establish B(B+/--->K+/-nu(nu))<2.4 x 10(-4) at 90% confidence level.     

What controls the phase diagram and superconductivity in Ru-substituted BaFe2As2?

We use high resolution angle-resolved photoemission to study the electronic structure of the iron based high-temperature superconductors Ba(Fe(1-x)Ru(x))(2)As(2) as a function of Ru concentration. We find that substitution of Ru for Fe is isoelectronic, i.e., it does not change the value of the chemical potential. More interestingly, there are no measured, significant changes in the shape of the Fermi surface or in the Fermi velocity over a wide range of substitution levels (0相似文献   

Tetraiododiborane(4) (B2I4) is a Polymer Based on sp3 Boron in the Solid State

Herein we present the first solid‐state structures of tetraiododiborane(4) (B₂I₄), which was long believed to exist in all phases as discrete molecules with planar, tricoordinate boron atoms, like the lighter tetrahalodiboranes(4) B₂F₄, B₂Cl₄, and B₂Br₄. Single‐crystal X‐ray diffraction, solid‐state NMR, and IR measurements indicate that B₂I₄ in fact exists as two different polymeric forms in the solid state, both of which feature boron atoms in tetrahedral environments. DFT calculations are used to simulate the IR spectra of the solution and solid‐state structures, and these are compared with the experimental spectra.     

Sulfoxide-alkene hybrids: a new class of chiral ligands for the Hayashi-Miyaura reaction

Sulfoxide-alkene hybrids are introduced as a new class of chiral heterodentate ligands for the Hayashi-Miyaura reaction. The synthesis of these ligands was achieved without the use of protecting groups. A chiral resolution was performed via simple column-chromatographic separation of the diastereomeric ligands. Both diastereomers proved to be excellent ligands in Rh-catalyzed 1,4-addition reactions, furnishing chiral products with high enantioselectivities and, remarkably, opposite stereoconfigurations.