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  • 1
    Electronic Resource
    Electronic Resource
    Insertion devices for BESSY II (1998)
    Chester : International Union of Crystallography (IUCr)
    Journal of synchrotron radiation 5 (1998), S. 443-444 
    Details
    ISSN: 1600-5775
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The high-brilliance synchrotron radiation source BESSY II will provide space for the installation of 14 insertion devices. At the time of writing (July 1997), eight insertion devices are funded. The first light for use by scientists will be available in January 1999. The undulators are designed for a scanning operation in parallel with the monochromator. This modus requires tight tolerances concerning the drive system. The first insertion device to be installed, a U-49 undulator, has been assembled and magnetically measured. The r.m.s. phase error is 2°. An endpole configuration using coils with less than 64 amp-turns makes the angular kick smaller than ±3 µrad over a gap range 15–50 mm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0909049597013757
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  • 2
    Electronic Resource
    Electronic Resource
    Transport through cavities with tunnel barriers: a semiclassical analysis (1998)
    Springer
    The European physical journal 3 (1998), S. 387-396 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 73.23.Ad Ballistic transport - 03.65.Sq Semiclassical theories and applications
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We study the influence of a tunnel barrier on the quantum transport through a circular cavity. Our analysis in terms of classical trajectories shows that the semiclassical approaches developed for ballistic transport can be adapted to deal with the case where tunneling is present. Peaks in the Fourier transform of the energy-dependent transmission and reflection spectra exhibit a nonmonotonic behaviour as a function of the barrier height in the quantum mechanical numerical calculations. Semiclassical analysis provides a simple qualitative explanation of this behaviour, as well as a quantitative agreement with the exact calculations. The experimental relevance of the classical trajectories in mesoscopic and microwave systems is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050326
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  • 3
    Electronic Resource
    Electronic Resource
    Observation of the nuclear rainbow scattering for12C+12C atE Lab =300 MeV (1982)
    Springer
    The European physical journal 308 (1982), S. 121-131 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The elastic and inelastic scattering of12C on12C has been measured in the angular range between 2.8° and 70.4° in the c.m. system atE Lab =300 MeV. Optical model calculations have been performed with Woods-Saxon and folded potentials, the ground state and the first 2+-state were coupled in the calculations. The large cross sections of the elastic scattering at large angles is related to the nuclear rainbow scattering, which is centered at about 56°. This requires a potential depth of 100 MeV at a distance of 3 fm, the fit to the data is sensitive down to this region. The calculations with the folded potential show a better agreement with the data than those with the Woods-Saxon shape. The total reaction cross section of 1,420 mb, obtained from the optical model analysis, corresponds to the geometrical value; no transparency is observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01413002
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  • 4
    Electronic Resource
    Electronic Resource
    Interaction of 80 MeV12C with88Sr; Neutron transfer, inelastic scattering and spin alignment of the 2+ State of12C (1982)
    Springer
    The European physical journal 305 (1982), S. 135-142 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using a Q3D magnetic spectrometer the elastic and inelastic scattering of12C on88Sr and the neutron pick-up (12C,13C) has been studied. The spin alignment of the inelastically excited 2+ state of12C (4.43 MeV) has been deduced from the line shapes broadened by theγ-decay in flight. Thus for eachm-substate a full angular distribution was obtained. Them=1 substate shows a shifted interference minimum, which is explained by the different strength of the Coulomb and nuclear amplitudes in them-substates. The analysis of the data on elastic scattering, inelastic scattering, alignment and the neutron transfer can be described consistently with one choice of the optical model parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01415021
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  • 5
    Electronic Resource
    Electronic Resource
    Two different sources of fast forward-emittedα-particles in heavy-ion reactions (1983)
    Springer
    The European physical journal 314 (1983), S. 143-147 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract For the reaction 290 MeV20Ne+197Au the number of neutrons emitted in coincidence withα-particles is used to discriminate between two equally important but qualitatively different mechanisms for the emission of fastα-particles. They are connected with low and high inelasticity, respectively, and the resultingα-particles differ in mean velocity and velocity distribution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01879872
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  • 6
    Electronic Resource
    Electronic Resource
    From ballistic motion to localization: a phase space analysis (2002)
    Springer
    The European physical journal 27 (2002), S. 11-14 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 05.60.Gg Quantum transport – 71.23.An Theories and models; localized states – 05.45.Pq Numerical simulations of chaotic models
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We introduce phase space concepts to describe quantum states in a disordered system. The merits of an inverse participation ratio defined on the basis of the Husimi function are demonstrated by a numerical study of the Anderson model in one, two, and three dimensions. Contrary to the inverse participation ratios in real and momentum space, the corresponding phase space quantity allows for a distinction between the ballistic, diffusive, and localized regimes on a unique footing and provides valuable insight into the structure of the eigenstates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e20020125
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  • 7
    Electronic Resource
    Electronic Resource
    Delocalization and Heisenberg's uncertainty relation (2002)
    Springer
    The European physical journal 30 (2002), S. 175-179 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 05.60.Gg Quantum transport – 71.23.An Theories and models; localized states
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: In the one-dimensional Anderson model the eigenstates are localized for arbitrarily small amounts of disorder. In contrast, the Aubry-André model with its quasiperiodic potential shows a transition from extended to localized states. The difference between the two models becomes particularly apparent in phase space where Heisenberg's uncertainty relation imposes a finite resolution. Our analysis points to the relevance of the coupling between momentum eigenstates at weak potential strength for the delocalization of a quantum particle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e2002-00372-9
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  • 8
    Electronic Resource
    Electronic Resource
    Residual conductance of correlated one-dimensional nanosystems: A numerical approach (2004)
    Springer
    The European physical journal 39 (2004), S. 107-120 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. We study a method to determine the residual conductance of a correlated system by means of the ground-state properties of a large ring composed of the system itself and a long non-interacting lead. The transmission probability through the interacting region, and thus its residual conductance, is deduced from the persistent current induced by a flux threading the ring. Density Matrix Renormalization Group techniques are employed to obtain numerical results for one-dimensional systems of interacting spinless fermions. As the flux dependence of the persistent current for such a system demonstrates, the interacting system coupled to an infinite non-interacting lead behaves as a non-interacting scatterer, but with an interaction dependent elastic transmission coefficient. The scaling to large lead sizes is discussed in detail as it constitutes a crucial step in determining the conductance. Furthermore, the method, which so far had been used at half filling, is extended to arbitrary filling and also applied to disordered interacting systems, where it is found that repulsive interaction can favor transport.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e2004-00176-y
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