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81.
L. Corradi S. J. Skorka U. Lenz K. E. G. Löbner P. R. Pascholati U. Quade K. Rudolph W. Schomburg M. Steinmayer H. G. Thies G. Montagnoli D. R. Napoli A. M. Stefanini A. Tivelli S. Beghini F. Scarlassara C. Signorini F. Soramel 《Zeitschrift für Physik A Hadrons and Nuclei》1990,335(1):55-72
Double differential cross sections of all prominent transfer channels have been measured in the systems33S +99,91,92Zr at two energies close to the nominal Coulomb barrier. In addition the fusion excitation functions of these systems have been measured below and around the barrier. The angular- andQ-distributions of the most important transfer reactions have been analysed in the framework of a simple semiclassical formalism. Particularly the two-nucleon transfer angular distributions exhibit strong multi step coupling effects which manifest themselves in reduced cross sections at large angles corresponding to close distances. From the angular distributions at forward angles, where a single step character of the transfer reaction can be assumed, approximate form factors have been extracted employing a first order perturbation theory. Within the uncertainties of a schematic coupled channels calculation the isotopic differences of the sub-barrier fusion enhancement can be understood on the basis of the isotopic differences of the transfer form factors andQ-values. 相似文献
82.
We study strictly ergodic Delone dynamical systems and prove an ergodic theorem for Banach space valued functions on the associated
set of pattern classes. As an application, we prove existence of the integrated density of states in the sense of uniform
convergence in distribution for the associated random operators.
Dedicated to J. Voigt on the occasion of his 60th birthday
Research partly supported by the DFG in the priority program Quasicrystals. 相似文献
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86.
Poly(alkyl α-chloroacrylates). IV. Tacticity analysis from 300 MHz proton magnetic resonance spectra
G. R. Dever F. E. Karasz W. J. Macknight R. W. Lenz 《Journal of polymer science. Part A, Polymer chemistry》1975,13(8):1803-1818
300 MHz proton magnetic resonance spectroscopy was applied to the determination of triad structures of three poly(alkyl α-chloroacrylates) of widely varying stereoregularities. Assignments and quantitative analyses were made for all of the tetrad peaks in the backbone methylene resonance of poly(methyl α-chloroacrylate), poly(ethyl α-chloroacrylate), and poly(isopropyl α-chloroacrylate). In addition the methyl singlet peaks of poly(methyl α-chloroacrylate), the methyl triplet peaks of poly(ethyl α-chloroacrylate) which had not been amenable previously to resolution at 220 MHz, and the methyl doublet peaks of poly(isopropyl α-chloroacrylate) were resolved, and the triad values which were obtained from these pendant ester group resonances compared favorably with triad values calculated from experimental tetrad values. As a demonstration of the internal agreement of the triad and tetrad peaks assignments, statistical calculations of the stereochemical structures of the actic and syndiotactic polymers were generally described well or to a first approximation by random selection statistics (Bernoullian) while the stereochemical statistics of the moderately to highly isotactic polymers were consistent with a nonrandom statistical process (first-order Markovian), as expected. 相似文献
87.
The role of the Δ-nucleus spin-orbit interaction in π-nucleus scattering is studied within the isobar-hole formalism. Due to the peripheral nature of the π-nucleus interaction, elastic scattering is very sensitive to the presence of such an L-S term. We report results for pion scattering on light nuclei in the resonance region. The systematics of the phenomenological Δ-nucleus optical potential are discussed. 相似文献
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89.
Hanfried Lenz 《Mathematische Annalen》1954,128(1):363-372
Ohne Zusammenfassung 相似文献
90.