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  • Chemistry  (4)
  • 21.10.Ft  (2)
  • 21.10.Re  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Reaction cross section measurements of the neutron-rich isotopes8,9,11Li at 80 MeV/nucleon (1991)
    Springer
    The European physical journal 340 (1991), S. 41-50 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.−k ; 27.20.+n ; 25.70.Np ; 21.10.Re
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Total interaction cross sections have been measured for8Li on C and Pb targets, for9Li on C, Al, Cu, Sn and Pb targets as well as for11Li on C, Sn and Pb targets. For each beam, we also used a plastic scintillator as target. The measurements with the scintillator targets are used to extract reduced nuclear radii of the lithium isotopes. These radii are then used for the calculation of the nuclear part of the total cross section for the other targets. The total electromagnetic-dissociation (EMD) cross sections have been deduced and are compared to different models. A strong target-charge-dependent EMD cross section is measured for11Li reaching 2.96 −0.82 +0.84 b for the Pb target. In the9Li case, a large EMD cross section for high-Z targets has been observed which amounts to 0.75 ± 0.45 b for the Pb target. The EMD cross sections of both,9Li and11Li, may be understood by the giantdipole-resonance model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01284479
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  • 2
    Electronic Resource
    Electronic Resource
    Total charge-changing cross sections for neutron-deficient isotopes from58Ni fragmentation (1995)
    Springer
    The European physical journal 352 (1995), S. 69-75 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.Ft ; 25.70.Np ; 27.40.+Z
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract At the projectile-fragment separator FRS of GSI, relativistic secondary beams of about 520 MeV/nucleon were produced by fragmentation of a primary beam of58Ni at 650 MeV/nucleon in a beryllium target. By means of aΔE—Bρ—TOF measurement, the fragments have been identified and their charge-changing probabilities in targets of CH2, C, Al, and Pb have been determined. We describe the results for the total charge-changing cross sections in this first paper, whereas a second article deals with the partial charge-changing cross sections. At the drip line, the measured charge-changing cross sections exhaust close to 100% of the total interaction cross sections as calculated with semiempirical models. The measurements at the proton drip line with low-Z targets indicate that only a very small increase of the cross sections may be observed, whereas the measurements with a lead target show that no significant increase of the total charge-changing cross sections is present which would be a hint for low-lying dipole strength. Our experimental data are compared to Glauber-type calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01292761
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  • 3
    Electronic Resource
    Electronic Resource
    Charge-changing cross sections of the neutron-rich isotopes8,9,11Li (1992)
    Springer
    The European physical journal 343 (1992), S. 375-379 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.−k ; 27.20.+n ; 25.70.Np ; 21.10.Re
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Total charge-changing cross sections have been measured for8Li on C and Pb targets, for9Li on C, Al, Cu, Sn and Pb targets, as well as for11Li on C, Sn and Pb targets at about 80 MeV/nucleon. These data are compared to measured total reaction cross sections and Glauber-type calculations using Hartree-Fock density distributions. These comparisons allow to draw conclusions on the proton density distribution of the neutronrich lithium isotopes. The results show that even for the most exotic nucleus11Li the proton distribution is only very weakly influenced by the long tail in the neutron density distribution already established in several experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01289813
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Partial charge-changing cross sections for neutron-deficient isotopes from58Ni fragmentation (1995)
    Springer
    The European physical journal 352 (1995), S. 77-83 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.Ft ; 25.70.Np ; 27.40.+z
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract At the projectile-fragment separator FRS of GSI, relativistic secondary beams of about 520 MeV/nucleon were produced by fragmentation of a primary beam of58Ni at 650 MeV/nucleon in a beryllium target. By means of aΔE—Bρ—TOF measurement, the fragments were identified and their charge-changing probabilities in targets of (CH2) n , C, Al, and Pb placed at the exit of the FRS were determined. Whereas a first article dealt with the total charge-changing cross sections, we describe in this second article the element distributions of these secondary fragments, which are found to depend strongly on the isospin of the secondary projectile as well as on the target material. In the case of the lead target, the influence of the electromagnetic dissociation is clearly visible in the one-proton and two-proton removal channels. The preference for the formation of even-Z fragments is much more pronounced for exotic secondary projectiles than for projectiles close to stability. Calculations with a geometrical abrasion-ablation model allow to understand the global features of the experimental data. However, far from stability, the discrepancies between calculations and experimental data increase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01292762
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  • 5
    Electronic Resource
    Electronic Resource
    Die bestimmung der maschenweite von netzwerk-lösungen aus fließkurven, KurzmitteilungHerrn Professor Dr. W. Franke mit allen guten Wünschen zum 65. Geburtstag gewidmet (1971)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 18 (1971), S. 195-202 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1971.050180118
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Untersuchungen über die Verknäuelung von technischen Polyisobutylenen (1976)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 52 (1976), S. 165-177 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: With technical grade polyisobutylenes (Oppanole B of BASF), light scattering in n-hexane, osmotic pressure in toluene, and intrinsic viscosity in different solvents are measured. The data are used to derive polydispersity, degree of coiling, and coil expansion of the samples. The undisturbed dimensions are estimated.
    Notes: An technischen Polyisobutylenen (Oppanole B der BASF) werden Lichtstreuungsmessungen in n-Hexan, osmotische Messungen in Toluol sowie Grenzviskositätszahlmessungen in verschiedenen Lösungsmitteln durchgeführt. Daraus werden Uneinheitlichkeit, Verknäuelungsgrad sowie Knäuel-Aufweitung der Proben ermittelt. Die ungestörten Dimensionen werden abgeschätzt.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1976.050520115
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  • 7
    Electronic Resource
    Electronic Resource
    Lineare polyester mit alkoholischen endgruppen und deren bestimmung (1955)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 17 (1955), S. 201-218 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The synthesis of polyesters from succinic acid and 1,6-hexanediol with alcoholic terminal groups by use of an excess of diol is described. They are obtained by meltingcondensation and condensation in solution. Polyesters of higher molecular weight with predominant alcoholic endgroups are prepared by secondary condensation with diol. By reacting the polyesters with phenylisocyanate polyesterdiurethanes are formed. The determination of nitrogen by the Kjeldahl method gives molecular weights with satisfactory precision up to molecular weight of ∼5 · 103. Aniline is obtained by total hydrolysis of polyesterdiurethanes. It is determined quantitatively by sensitive photometric measurements. Molecular weights were calculated from the determined amount of aniline with sufficient precision up to molecular weight of 8 · 104.
    Notes: Lineare Bernsteinsäure-1,6-Hexandiol-Polyester mit alkoholischen Endgruppen werden mit einem überschuß des Diols durch Schmelz- und durch Lösungskondensation hergestellt. Höhermolekulare Polyester mit überwiegend alkoholischen Endgruppen werden durch. Nachkondensation mit dem Diol erhalten. Die Umsetzung der Produkte mit Phenylisocyanat führt zu Polyesterdiurethanen. Die Ermittlung des Stickstoffs nach Kjeldahl liefert mit befriedigender Genauigkeit Endgruppenmolekulargewichte bis zum Molgewicht ∼5 · 103. Bei der Totalhydrolyse der Polyesterdiurethane bildet sich Anilin, das mit einem empfindlichen, photometrischen Verfahren quantitative erfaßt wird. Aus der so bestimmten Anilinmenge wurden Endgruppenmolekulargewichte bis zum Molgewicht 8 · 104 mit ausreichender Genauigkeit ermittelt.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1955.020170115
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  • 8
    Electronic Resource
    Electronic Resource
    Lineare polyester mit carboxylendgruppen und deren bestimmung (1955)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 17 (1955), S. 219-230 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: By reaction of „alcoholic“ poly-1,6-hexanediol-succinate with succinic anhydride in benzene solution chain-analogous polyesters with terminal carboxylgroups are obtained. Molecular weights of polyesters up to ∼ 7 · 103 are determined by titration of the carboxyl end groups. Polyester-dicarboxylic acids react with phenylisocyanate in inert solvents by prolongation of chains, forming carboxyl anhydride groups. The reaction of polyesterdicarboxylic acids with phenylisocyanate without diluent is a chain-analogous one. Terminal carboxylic acid anilide groups are formed. After hydrolysis these end groups are determined quantitatively by photometric measurements of aniline formed. The molecular weights are calculated and agree with those obtained by titration. Viscosimetric measurements have been made.
    Notes: Durch Umsetzung von „alkoholischen“ Bernsteinsäure-1,6-Hexandiol-Polyestern mit Bernsteinsäureanhydrid in Benzol werden kettenanaloge Polyester mit endständigen Carboxylgruppen hergestellt. Die Titration dieser Carboxylgruppen ergibt Molgewichte bis ∼ 7 · 103. Mit Phenylisocyanat in indifferenten Lösungsmitteln reagieren Polyesterdicarbonsäuren unter Kettenverlängerung und Bildung von kettenständigen Carbonsäureanhydridgruppen. Die Umsetzung der Polyester-dicarbonsäuren in Phenylisocyanat ohne Verdünnungsmittel erfolgt kettenanalog unter Bildung von Carboxanilidendgruppen. Durch photometrische Anilinbestimmung nach der Hydrolyse können diese Endgruppen quantitativ bestimmt und Molgewichte berechnet werden, die mit den titrimetrisch erhaltenen Molgewichten übereinstimmen. Es werden weiterhin viskosimetrische Messungen an Lösungen der Polyester ausgeführt.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1955.020170116
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