Target fragmentation in proton-nucleus and16O-nucleus reactions at 60 and 200 GeV/nucleon

Target remnants withZ<3 from proton-nucleus and¹⁶O-nucleus reactions at 60 and 200 GeV/nucleon were measured in the angular range from 30° to 160° (?1.7<η<1.3) employing the Plastic Ball detector. The excitation energy of the target spectator matter in central oxygen-induced collisions is found to be high enough to allow for complete disintegration of the target nucleus into fragments withZ<3. The average longitudinal momentum transfer per proton to the target in central collisions is considerably higher in the case of¹⁶O-induced reactions (≈300 MeV/c) than in proton-induced reactions (≈130 MeV/c). The baryon rapidity distributions are roughly in agreement with one-fluid hydrodynamical calculations at 60 GeV/nucleon¹⁶O+Au but are in disagreement at 200 GeV/nucleon, indicating the higher degree of transparency at the higher bombarding energy. Both, the transverse momenta of target spectators and the entropy produced in the target fragmentation region are compared to those attained in head-on collisions of two heavy nuclei at Bevalac energies. They are found to be comparable or do even exceed the values for the participant matter at beam energies of about 1–2 GeV/nucleon.     

Zur instationären Wärmeleitung in Festkörpern

Summary For a continuum containing point defects one can deduce an integro-differential equation describing the conduction of heat which implies the usual parabolic differential equation as a special case and which permits the expansion of a perturbation with a finite velocity. The structure of integro-differential equation and solutions is studied for simple examples.     

Bewertungssysteme in Moduln. II

Ohne Zusammenfassung     

Synthesen und pharmakologische Eigenschaften von 2,2-Dialkyl-5-aryl-3-pyridylpyrrolidinen

Syntheses and Pharmacological Properties of 2,2-Dialkyl-5-aryl-3-pyridylpyrrolidines Reaction of the photochemically generated benzonitrile methylides 2 with vinylpyridines yields 2-aryl-4-pyridyl-1-pyrrolines 3. Depending on reduction methods, the compounds 3 are selectively transformed to the corresponding cis- or the trans-substituted pyrrolidines 10 or 11 , respectively. Furthermore, a non-photochemical synthesis has been developed: the easily available nitro-ketones 8 provide through reductive cyclization the pyrrolines 3 or directly the pyrrolidines 11. Twenty-seven compounds of types 10 and 11 have been evaluated in the writhing, hot plate and kaolin tests; especially the cis-pyrrolidines 10 exhibit a valuable antinociceptive activity. Some of the pyrrolines and pyrrolidines have been separated into their enantiomers, which are easily interconverted.     

Computer model of the formation of self-organizing systems

A model of a simple self-organizing system is investigated. Mechanisms that are important to a molecular-biological understanding of evolution are studied with the aid of the model.     

Charged particle spectra in16O induced nuclear collisions at the CERN SPS

Charged particle multiplicity distributions and pseudo-rapidity density distributions from¹⁶O induced nuclear collisions at 200 and 60A GeV are presented. The data were taken, using a minimumbias trigger, with the WA80 set-up at the CERN SPS. In this presentation we focus on how the yield of charged particles depends on the projectile energy, the mass number of the target nucleus and the energy measured in a uranium-plastic sampling calorimeter covering angles close to zero degrees. The data are compared to simulations from the event generator FRITIOF.     

Die invarianten Teilräume der stetigen Endomorphismen von ω

Ohne Zusammenfassung