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  • 1990-1994  (7)
  • Polymer and Materials Science  (4)
  • 21.60.−n  (2)
  • 25.30.Dh  (1)
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Material
Years
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Super-allowed beta decay of nuclei at the drip-line (1991)
    Springer
    The European physical journal 340 (1991), S. 255-261 
    Details
    ISSN: 1434-601X
    Keywords: 23.40.Hc ; 21.60.−n ; 27.20.+n
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have investigated the continuous particle spectra following the beta decay of the neutron-rich nuclei that terminate the mass 6, 8, 9 and 11 isobaric chains. Strong beta transitions feeding the very top of the spectrum are found systematically. The favoured states are within a few MeV of the energy of the initial state. This phenomenon seems to be linked to the occurrence of a di-neutron structure or neutron halo in the drip-line nuclei.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294673
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Electroexcitation of magnetic dipole and other modes in46Ti and48Ti (1990)
    Springer
    The European physical journal 336 (1990), S. 159-178 
    Details
    ISSN: 1434-601X
    Keywords: 21.60.-n ; 25.30.Dh ; 27.40.+z
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract With high-resolution inelastic electron scattering measurements on46Ti and48Ti the excitation mechanism of the transition into low lying Jπ=1+ states is investigated. The experimental evidence of considerable contribution of the orbital part of theM1 operator to the total transition strength is given by a model dependent analysis of form factors. The possibility of physical relationship to low lying Jπ=1+ states in the rare earth nuclei is discussed in various models. MoreoverE2 form factors and good candidates forM3 form factors are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01290617
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Phenomenological wave functions for the massA=14 system and a consistent description of beta decay observables (1991)
    Springer
    The European physical journal 341 (1991), S. 9-24 
    Details
    ISSN: 1434-601X
    Keywords: 21.60.−n ; 23.40.−s ; 25.30.−c
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A set of phenomenological wave functions has been derived to describe the14N ground state and the isospin triplet consisting of the14C ground state, the first excited state of14N at 2.313 MeV and the14O ground state. Elastic and inelastic electron scattering form factors, the magnetic moment of the14N ground state and the shape factors in theβ ± decay have been employed in a multiparameter fitting procedure to determine the amplitudes of the wave functions inL-S coupling. The inclusion of the beta decay observables in the fit has become possible for the first time since exact formulas for the shape factor in higher order do exist. The set of wave functions deduced exhibit predominately anL=0 contribution for the 0+; 1 states andL=1 and 2 contributions of nearly equal weight for the 1+; 0 state. It was observed that the inclusion of the shape factors allowed a more stringent determination of the amplitudes compared to previous attempts reported in the literature and led in the case of the 0+; 1 states to wave functions that show a small but noticeable difference within the isospin triplet. Besides the observables used for the fit, the radiative widthΓ γ (M1) of the 2.313 MeV state in14N can be described quite well with the derived wave functions, and in addition it has become possible to predict the pathological largeft − value of the14C decay and theft + value of the14O decay precisely. The wave functions are also applied to calculate the14N(γ,π +) cross section.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01281270
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    133. Poröses Silicium - ein Material der Mikrosystemtechnik (1993)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 65 (1993), S. 1132-1133 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.3306509135
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Influence of temperature on the supermolecular structure of polyethylene - a Raman spectroscopic study (1991)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 42 (1991), S. 337-338 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1991.010420712
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Organische Elektronenleiter und Vorstufen. XIII. Untersuchungen zum thermischen Verhalten von Poly(bis-alkylthio-acetylen)en (1991)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 42 (1991), S. 615-620 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The thermal properties of poly(bis-alkylthio-acetylene)s in the temperature range from 30°C to 600°C have been investigated. On the basis of thermal analysis, 13C-solid state NMR and ESR spectroscopic measurements on the solid phases and gas chromatographic characterization of the volatile pyrolysis products, possible pyrolysis reactions are formulated. A simple kinetic model of the thermal behaviour of poly(bis-methylthio-acetylene) in a wide range of temperature and time is suggested.
    Notes: Das thermische Verhalten der Poly(bis-alkylthio-acetylen)e wurde im Temperaturbereich von 30°C bis 600°C untersucht. Aus den Ergebnissen der thermischen Analyse, aus 13C-Festkörper-NMR- und ESR-Messungen an den festen Thermolyserückständen und der Untersuchung der flüchtigen Pyrolyseprodukte werden mögliche Abbaureaktionen abgeleitet. Für einen weiten Zeit- und Temperaturbereich wird für Poly(bis-methylthio-acetylen) ein einfaches kinetisches Modell formuliert.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1991.010421201
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    NMR-Untersuchungen zu Struktur und Beweglichkeit von substituierten Polyacetylenen (1990)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 41 (1990), S. 522-527 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Poly(bis-methylthio-acetylene) and poly(bis-ethylthio-acetylene) were investigated by 13C-NMR with respect to the structure of the main chain and the mobility of the side chains. The main chain consists of sp2-hybridized carbon atoms. The 1,2-bisalkylthylen units build up a nonplanar polymer backbone, which does not show any discrete configurations. In poly(bis-methylthio-acetylene) the MeS units undergo a rotational diffusion motion with a resorentation rate of about 70 kHz. The electron spin dynamics have on importance within the main chain.
    Notes: Poly(bis-methylthio-acetylen) und Poly(bis-ethylthio-acetylen) wurden hinsichtlich der Struktur der Hauptkette und der Beweglichkeit der Seitenketten mittels 13C-NMR-Spektroskopie untersucht. Die Hauptkette bestecht aus sp2- hydridisierten C-Atomen. Die 1,2-Bisalkythioethylen-Einheiten bilden ein nicht-Planares Polymerrückgrat, für das keine distreten Konfigurationen nachzuweisen sind. In Poly(bis-methylthio-acetylen) führen die MeS-Einheiten eine Rotationsdiffusionsbewegung von etwa 70 kHz aus. Innerhalb der Hauptkette hat die Elektronenspindynamik keine Bedeutung.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1990.010411003
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    Paper (German National Licenses)
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