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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
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Dr. Pawel Jewula Mickaël Grandmougin Mélanie Choppin Anna Maria Chiara Tivelli Dr. Agnese Amati Dr. Yoann Rousselin Dr. Lydia Karmazin Dr. Jean-Claude Chambron Dr. Michel Meyer 《欧洲无机化学杂志》2023,26(13):e202300038
Six- and seven-membered cyclic hydroxamic acids are found as terminal binding units in different families of siderophores, including exochelins and mycobactins. The simplest models of these preorganized chelating ligands were known, but their coordination chemistry with Fe3+, the target metal ion of siderophores, had never been reported. Four complexes were synthesized and studied: two Fe3+ complexes, one with the six-membered ring hydroxamate PIPO− and one with the seven-membered ring hydroxamate AZEPO−, and the two corresponding Ga3+ complexes. X-ray diffraction studies showed that the interligand repulsion energies were better minimized in the case of the AZEPO− complexes whatever the metal cation considered, and that the Fe−O bond distances were shorter in [Fe(AZEPO)3] by comparison with [Fe(PIPO)3]. 相似文献
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S. J. Skorka A. M. Stefanini G. Fortuna R. Pengo W. Meczynski G. Montagnoli A. Tivelli S. Beghini C. Signorini P. R. Pascholati 《Zeitschrift für Physik A Hadrons and Nuclei》1987,328(3):355-362
Sub-barrier fusion excitation functions of35,37Cl+58,64Ni have been measured. They are discussed in comparison to similar data of34,36S+58,64Ni with the aim of revealing the influence of coupled proton transfer channels. Using the simplified coupled channel code CCFUS, differences in the effects of inelastic channels are eliminated in an approximative manner to stress the differences in the effects of transfer channels. Signatures of positiveQ-value transfer channels coupled to fusion are clearly identified. 相似文献
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