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  • 1
    Digitale Medien
    Digitale Medien
    Further evidence for nuclear rolling friction acting in heavy-ion induced reactions (1983)
    Springer
    The European physical journal 310 (1983), S. 229-232 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Recent experimental results on heavy-ion fusion cross sections for asymmetric systems and on angular momentum transfer in damped collisions are shown to be well described, if rolling friction is explicitly taken into account. Its neglect in various other trajectory calculations leads to a significant underestimate of the fusion cross section as well as of the transferred angular momentum.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01415227
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  • 2
    Digitale Medien
    Digitale Medien
    Measurement of the η production in proton-proton collisions with the COSY time-of-flight spectrometer (2003)
    Springer
    The European physical journal 16 (2003), S. 127-137 
    Details
    ISSN: 1434-601X
    Schlagwort(e): PACS. 25.40.Ve Other reactions above meson production thresholds (energies 400 MeV) – 13.75.Cs Nucleon-nucleon interactions (including antinucleons, deuterons, etc.) – 14.40.Aq π, K, and η mesons
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: The reaction pp → ppη was measured at excess energies of 15 and 41 MeV at an external target of the Jülich Cooler Synchrotron COSY with the time-of-flight spectrometer. About 25000 events were measured for the excess energy of 15 MeV and about 8000 for 41 MeV. Both protons of the process ppη were detected with an acceptance of nearly 100% and the η was reconstructed by the missing-mass technique. For both excess energies the angular distributions are found to be nearly isotropic. In the invariant-mass distributions strong deviations from the pure phase space distributions are seen.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1140/epja/i2002-10079-7
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  • 3
    Digitale Medien
    Digitale Medien
    Search for delayed α-decay of high spin isomers in heavy-ion induced fusion reactions (1981)
    Springer
    The European physical journal 301 (1981), S. 349-352 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A search forα-decay of high spin isomers in the mass range 140〈A〈200 is reported. Fusion reactions with beams of132Xe and50Ti have been used to provide high velocity recoils with angular momenta beyond 50ℏ. Recoil distance experiments sensitive to half lives longer than 10 ps and shorter than about 1 ns have been performed for 31 different compound nuclei. Within a sensitivity of 1–30μb per event no delayedα-emission has been observed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01421700
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  • 4
    Digitale Medien
    Digitale Medien
    Light charged particle decay in the reaction7Li+16O (1995)
    Springer
    The European physical journal 351 (1995), S. 43-58 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 24.60.Dr ; 25.70.Gh
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Angular distributions and excitation functions for the emission of a large number of proton, deuteron, triton, andα-particle groups in7Li+16O reactions have been measured in the vicinity of the Coulomb barrier. Within the framework of the statistical reaction model, two approaches are presented that can reproduce the only weakly anisotropic shape of the angular distributions and the absolute cross section for those groups of ejectiles where contributions from direct reaction modes are small. When a standard Woods-Saxon potential deduced from elastic scattering is used, the entrance channel angular momentum distribution must be limited to values below critical angular momental cr which are smaller than the grazing angular momental gr if fusion is to be described. A global proximity potential with a parameter set that has been adjusted to reproduce the fusion reactions of a variety of p- and sd-shell nuclei yields very similar results when applied to7Li+16O. The proximity potential effectively introduces a similar angular-momentum limitation. This analysis proves the existence of a fusion cross section limitation and the importance of strong direct reaction modes (transfer and possibly inelastic processes) in7Li+16O reactions at energies close to and even below the Coulomb barrier. Another aspect of7Li+16O is addressed briefly. The resonance-like structure observed in the heavy-ion radiative capture reaction7Li(16O,γ 0+1)23Na atE x (23Na)=25.4 MeV is not observed in the particle decay channels investigated in the present work.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01292785
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  • 5
    Digitale Medien
    Digitale Medien
    Ceftazidime, ceftizoxime, cefotaxime and HR 221 in experimental chronic Escherichia coli pyelonephritis in rats (1983)
    Springer
    Infection 11 (1983), S. S54 
    Details
    ISSN: 1439-0973
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Die therapeutische Effektivität und Pharmakokinetik der Cephalosporine Ceftazidim, Ceftizoxim, Cefotaxim und HR 221 wurde tierexperimentell untersucht. Tiermodell war die experimentelle östrogengebahnte und nicht-gebahnte chronischeE. coli-Pyelonephritis der Ratte. Die Tiere wurden für eine Woche 2× täglich mit 5 mg Cephalosporin/kg behandelt. Alle Cephalosporine führten zu einem signifikanten Abfall der renalen Keimzahlen trotz der niedrigen Dosierung. In beiden Tiermodellen war Ceftazidim signifikant wirksamer als HR 221, obwohl die Serumspiegel von HR 221 höher waren und länger andauerten als die von Ceftazidim. Unterschiede in der Pharmakokinetik (metabolische Stabilität, Proteinbindung) könnten der Grund für die unterschiedliche therapeutische Effektivität sein, da die antimikrobielleIn-vitro-Aktivität aller Cephalosporine gegenüber dem Testkeim sehr ähnlich war.
    Notizen: Summary The therapeutic efficacy and pharmacokinetics of the cephalosporins ceftazidime, ceftizoxime, cefotaxime and HR 221 were studied in animal experiments. The animal model used was experimental estrogen-induced or non-induced chronicEscherichia coli pyelonephritis in rats. The animals were treated with 5 mg cephalosporin/kg twice daily for one week. Each of the cephalosporins tested led to a significant decrease in renal bacterial counts, in spite of the low doses given. Ceftazidime was significantly more active than HR 221 in both experimental models, although the serum levels of HR 221 were higher and were maintained for a longer period of time than those of ceftazidime. Differences in pharmacokinetic properties (influenced by metabolic stability and protein binding) could be the reason for the differences in therapeutic activity, since thein vitro antimicrobial activity of each of the cephalosporins tested was very similar against the test strain.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01641108
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