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  • Polymer and Materials Science  (8)
  • 21.60.−n  (3)
  • 25.30.Dh  (3)
  • 1
    Electronic Resource
    Electronic Resource
    The115In(γ, γ′) reaction as a test of the quasi-particle phonon model with complex configurations in odd-mass nuclei (1995)
    Springer
    The European physical journal 350 (1995), S. 303-309 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.Tg ; 21.60.−n ; 25.20.Lj ; 27.60.+j
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The115In(γ, γ′) reaction was measured at the S-DALINAC using bremsstrahlung with endpoint energiesE 0=3.1, 4.6 and 5.2 MeV. In the excitation energy range of 1–5 MeV in total 32 transitions were observed, 18 of which were hithertoo unknown. The results are compared to two quasiparticle-phonon model calculations, one with a model space of ‘quasiparticle⊗phonon’ and one extended by ‘quasiparticle⊗two-phonon’ configurations. A substantial improvement is achieved in the description of low-lying115In states by the consideration of the more complex configurations. The calculations quantitatively account for the summed115In(γ, γ′) integrated cross sections and show a comparable amount of fragmentation of the individual transition strengths. The model interpretation of the microscopic structure of the experimentally observed transitions is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01291187
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  • 2
    Electronic Resource
    Electronic Resource
    No evidence for medium effects in the12C(e, e'p)11Bg.s. reaction (1995)
    Springer
    The European physical journal 351 (1995), S. 353-354 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.Pc ; 25.30.Dh ; 24.50.+g ; 27.20.+n
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The12C(e, e'p)11B g.s reaction has been measured in parallel and anti-parallel kinematics over ap m range of −120〈p m〈120 MeV/c at a centralT p of 90 MeV. In contrast to previous measurements at NIKHEF, both kinematics can be described without enhancement of the transverse form factor of the bound proton (η=0.98(5)). The spectroscopic factor for this transition as determined with the new Mainz data (S α =1.54(5)) is 22% smaller than the NIKHEF value.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01291135
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  • 3
    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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  • 4
    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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  • 5
    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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  • 6
    Electronic Resource
    Electronic Resource
    Line shape and excitation strength of the first excited state in9Be (1987)
    Springer
    The European physical journal 326 (1987), S. 447-454 
    Details
    ISSN: 1434-601X
    Keywords: 21.60.CS ; 25.30.Dh ; 27.20.+n
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The line shape and the excitation strength of the very weak first excited J π =1/2+ state at Ex=1.684 MeV in Zeitschrift für Physik Zeitschrift für Physik9Be has been investigated with high-resolution inelastic electron scattering at E0=45 and 49 MeV and scattering angles θ=105°, 117°, 129° and 165°, and with high-resolution inelastic proton scattering at E0=13MeV and θ=15° and 18°. Due to lying just above the neutron threshold the level has a strongly asymmetric line shape which in both experiments can be described consistently with a Breit-Wigner expression modified on the low energy side by the threshold behaviour of the cross section. The resonance energy is ER=1.684 ± 0.007 MeV and the width T=217± 10 keV in thec.m. system. A single particle potential model calculation reproduces the line shape and the resonance parameters fairly well. In addition, the inelastic electron scattering form factor has been measured. In the range of momentum transfersq =0.24-0.46 fm−1 it is dominated by a 0p3/2→ 1s1/2 particle-hole transition. The transition is mainly longitudinal and of isoscalar nature with a strength of B (E1)↑ =0.027 + 0.002 e2 fm2, but a small M2 contribution ofB(M2)↑=8.8 ±1.5 μ N 2 fm2 has also been detected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01289549
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  • 7
    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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  • 8
    Electronic Resource
    Electronic Resource
    Waveguide Effect on the Image Formation Process in Near-field Photocurrent Spectroscopy of Semiconductor Laser Diodes (1997)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 25 (1997), S. 573-582 
    Details
    ISSN: 0142-2421
    Keywords: near-field microscopy ; laser diodes ; photocurrent spectroscopy ; optics ; semi-conductor lasers ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Near-field photocurrent spectra of high-power laser diode arrays with different wave-guide characteristics are reported. Subwavelength spatial resolution is achieved by using a near-field fibre probe as the excitation source. The effect of the laser diode waveguide structure and of surface recombination processes on the near-field photocurrent image formation is discussed and analysed in terms of a beam propagation model. Experiments on laser diodes before and after accelerated ageing demonstrate the potential of the technique for analysing microscopic defect formation processes in optoelectronic devices.© 1997 John Wiley & Sons, Ltd.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Near-field Optical Spectroscopy of Single GaAs Quantum Wires (1997)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 25 (1997), S. 583-592 
    Details
    ISSN: 0142-2421
    Keywords: near-field microscopy ; semiconductors ; quantum wires ; photoluminescence spectroscopy ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The nanoscopic room temperature optical properties of single quantum wires are characterized by a combination of near-field photoluminescence and photoluminescence excitation spectroscopy. Single GaAs quantum wires with a 50 nm lateral dimension are grown at the edge of 15 nm high mesa stripes on patterned GaAs(311) surfaces. Wire formation relies on the preferential migration of Ga atoms from a GaAs layer on the mesa top and bottom towards the sidewall. Spatially resolved photoluminescence spectra separate quantum wire and quantum well emission and image the diffusion of photoexcited carriers into the wires. Photoluminescence excitation spectra give insight into the absorption spectrum of the wires and the spectral position of different interband transitions in the one-dimensional carrier system. They allow the change in local thickness of the GaAs quantum well due to the migration process to be monitored directly with subwavelength spatial resolution. Both the trapping of carriers into the wire and the detrapping of carriers generated within the wire into the surrounding quantum well states are separately resolved.© 1997 John Wiley & Sons, Ltd.
    Type of Medium: Electronic Resource
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  • 10
    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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