排序方式: 共有23条查询结果,搜索用时 15 毫秒
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D. I. Ivanov A. S. Iljinov M. V. Mebel V. G. Nedorezov A. S. Sudov A. A. Turinge T. von Egidy S. Schmid W. Schmid H. Rossner J. Eades 《Zeitschrift für Physik A Hadrons and Nuclei》1995,352(2):191-195
The A dependence of nuclear fission induced by stopped antiprotons has been measured. An unambiguous identification of the binary fission decay mode was provided by a coordinate measurement of complementary fission fragments in coincidence using a large-acceptance fission detector based on low pressure multiwire proportional chambers. A deep fissility minimum was observed nearA=100, in agreement with the general behaviour predicted by the liquid-drop model. An unexpectedly low and high fission probability was found for the Ag and Cu nuclei, respectively. 相似文献
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One-pot RAFT/"click" chemistry via isocyanates: efficient synthesis of α-end-functionalized polymers
Gody G Rossner C Moraes J Vana P Maschmeyer T Perrier S 《Journal of the American Chemical Society》2012,134(30):12596-12603
A new methodology has been developed for preparing α-functional polymers in a one-pot simultaneous polymerization/isocyanate "click" reaction. Our original synthetic strategy is based on the preparation of a carbonyl-azide chain transfer agent (CTA) precursor that undergoes the Curtius rearrangement in situ during reversible addition-fragmentation chain transfer (RAFT) polymerization yielding well-controlled α-isocyanate modified polymers. This strategy overcomes numerous difficulties associated with the synthesis of a polymerization mediator bearing an isocyanate at the R group and with the handling of such a reactive functionality. This new carbonyl-azide CTA can control the polymerization of a wide range of monomers, including (meth)acrylates, acrylamides, and styrenes (M(n) = 2-30 kDa; ? = 1.16-1.38). We also show that this carbonyl-azide CTA can be used as a universal platform for the synthesis of α-end-functionalized polymers in a one-pot RAFT polymerization/isocyanate "click" procedure. 相似文献
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Goldenbaum F Bohne W Eades J Egidy Tv Figuera P Fuchs H Galin J Golubeva YS Gulda K Hilscher D Iljinov AS Jahnke U Jastrzebski J Kurcewicz W Lott B Morjean M Pausch G Péghaire A Pienkowski L Polster D Proschitzki S Quednau B Rossner H Schmid S Schmid W Ziem P 《Physical review letters》1996,77(7):1230-1233
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Multiple-excitation cross sections for the scattering of 70.4 MeV 12C ions on the even neodymium isotopes are calculated by the method of angle-dependent phase shifts. The results are compared with the data. 相似文献
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The reaction channels of the system 16O + 16O with outgoing heavy particles from lithium to magnesium have been measured using a ΔE-E telescope. Excitation functions from 49 to 65 MeV at θLab = 30° and angular distributions from θLab = 10° (20°) to 50° at ELab = 51.5 MeV are presented for the strong transitions. The excitation function of the 12C-20Ne (4.25 MeV) channel shows a pronounced regular cross structure with peaks at 52 and 60 MeV. A selective excitation of certain states in the inelastic scattering and the 12C-20Ne channel is observed; the yields of the other heavy-ion channels being weaker by at least one order of magnitude. An explanation of this phenomenon is given by considering the angular momentum matching between entrance and exit channels. Furthermore it is shown that no strong dependence of the cross sections on the transferred angular momentum or on the nuclear structure of the final states is observed. Possible implications of these results on the reaction mechanism are discussed. 相似文献
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H. J. Krappe K. Möhring M. C. Nemes H. Rossner 《Zeitschrift für Physik A Hadrons and Nuclei》1983,314(1):23-31
We study the well-known deviation of measured fusion cross-sections below the barrier from predictions of one-dimensional tunnelling models. A simple parametrisation of measured excitation functions is discussed which allows to identify a smooth general trend depending only on gross nuclear properties. The parametrisation is substantiated by quantum mechanically exact calculations in a two-dimensional tunnelling model. Various possibilities for the geometrical interpretation of the second degree of freedom are discussed. Neck formation is identified as the most probable degree of freedom effecting the overall behavior of sub-barrier fusion. 相似文献
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Zeitschrift für Physik A Hadrons and nuclei - It is shown that the phase-shift analysis of elastic-scattering data leads to a set of illposed, non-linear, stochastic equations. An algorithm is... 相似文献
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Christian Rossner Ekaterina B. Zhulina Eugenia Kumacheva 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(27):9370-9375
Using two orthogonal external stimuli, programmable staged surface patterning and self‐assembly of inorganic nanoparticles (NPs) was achieved. For gold NPs capped with end‐grafted poly(styrene‐block‐(4‐vinylbenzoic acid)), P(St‐block‐4VBA), block copolymer ligands, surface‐pinned micelles (patches) formed from NP‐adjacent PSt blocks under reduced solvency conditions (Stimulus 1); solvated NP‐remote P(4VBA) blocks stabilized the NPs against aggregation. Subsequent self‐assembly of patchy NPs was triggered by crosslinking the P(4VBA) blocks with copper(II) ions (Stimulus 2). Block copolymer ligand design has a strong effect on NP self‐assembly. Small, well‐defined clusters assembled from NPs functionalized with ligands with a short P(4VBA) block, while NPs tethered with ligands with a long P(4VBA) block formed large irregularly shaped assemblies. This approach is promising for high‐yield fabrication of colloidal molecules and their assemblies with structural and functional complexity. 相似文献