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  • 1995-1999  (2)
  • 1990-1994  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Fission and gamma-ray decay of the238U shape isomer (1992)
    Springer
    The European physical journal 341 (1992), S. 145-154 
    Details
    ISSN: 1434-601X
    Keywords: 23.20.Ck ; 23.20.Lv ; 25.85.Ge ; 27.90.+b
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The decay of the238U superdeformed shape isomer has been reinvestigated by detecting for the first time simultaneously the fission and the gamma-back decay. An electrostatic deflection system has been used to transport the238mU recoils, produced in a238U(d, pn) reaction with a pulsed beam of 18 MeV deuterons, in front of a detector set-up consisting of three ion-implanted solidstate detectors and a Ge(Li) gamma-detector. The gamma-back decay has been measured in coincidence with conversion electrons of the 2+ → 0+ transition deexciting the first rotational state in238U. Two gamma-transitions of 2.513 MeV and 1.878 MeV have been observed with half-lives consistent with the result obtained for the decay by delayed fissionT 1/2=(298±18) ns.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01298474
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Near-barrier transfer and fusion of the systems33S +90,91,92Zr (1990)
    Springer
    The European physical journal 335 (1990), S. 55-72 
    Details
    ISSN: 1434-601X
    Keywords: 25.70.Cd ; 25.70. Jj
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Double differential cross sections of all prominent transfer channels have been measured in the systems33S +99,91,92Zr at two energies close to the nominal Coulomb barrier. In addition the fusion excitation functions of these systems have been measured below and around the barrier. The angular- andQ-distributions of the most important transfer reactions have been analysed in the framework of a simple semiclassical formalism. Particularly the two-nucleon transfer angular distributions exhibit strong multi step coupling effects which manifest themselves in reduced cross sections at large angles corresponding to close distances. From the angular distributions at forward angles, where a single step character of the transfer reaction can be assumed, approximate form factors have been extracted employing a first order perturbation theory. Within the uncertainties of a schematic coupled channels calculation the isotopic differences of the sub-barrier fusion enhancement can be understood on the basis of the isotopic differences of the transfer form factors andQ-values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01289348
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Isomeric state at 945.3 keV in237Np (1990)
    Springer
    The European physical journal 337 (1990), S. 371-375 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.Hw ; 23.20.Ck+Lv ; 27.90.+b
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new isomeric state in237Np has been discovered at an excitation energy of (945.3±0.2) keV withT 1/2 =(711±40) ns. Six gamma-ray lines have been measured depopulating the isomeric state to known levels in237Np. The comparison of the measured absolute gamma-ray transition probabilities with empirical values yields as most probable spinI andK assignmentI=K=13/2 for this isomeric state. It is most likely a 1-proton-2-neutron quasiparticle state 13/2−π5/2+ [642] +ν7/2− [743] + ν 1/2+ [631]. However, a one-quasiparticle 11/2− [505] configuration for the isomer cannot be excluded.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294973
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Movable microstructures made by a sub-micron LIGA process (1996)
    Springer
    Microsystem technologies 2 (1996), S. 149-152 
    Details
    ISSN: 1432-1858
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Technology
    Notes: Abstract  Movable microstructures with high aspect ratios were made with lateral dimensions down to the sub-micron domain by the LIGA process and a sacrificial layer technique. Compared to microstructures usually made by LIGA, all dimensions were reduced approximately by a factor of 10, while the aspect ratio was kept constant. The smaller resist thickness in the range of some ten micrometers allowed much lower X-ray doses and energies to be used for exposure and the absorbers with a thickness of only 3 μm to be employed. As the lateral dimensions are smaller, a much larger number of devices can be fabricated in one batch. Therefore, the production costs of deep etch X-ray lithography are reduced dramatically. Electrostatic linear actuators with lateral dimensions as small as 500 nm were manufactured to demonstrate the advantages of LIGA in sub-micron dimensions. An X-ray mask with absorbers 2.8 μm high was produced by a three-level technique. The linear actuators consisted of several arrays of capacitor plates combined into an electrostatic driving unit with an active area, typically, 0.3 mm2 and less. The driving unit was supported by folded beam flexures to avoid frictional forces. They also guaranteed parallel movement of the capacitor plates. The functionality of these devices was demonstrated by measuring displacement as a function of the voltage applied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s005420050033
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    High aspect ratio multi-level mold inserts fabricated by mechanical micro machining and deep etch X-ray lithography (1996)
    Springer
    Microsystem technologies 2 (1996), S. 174-177 
    Details
    ISSN: 1432-1858
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Technology
    Notes: Abstract  Complex microstructures can be fabricated in large quantities by thermoplastic molding processes. The shape of the microstructures is determined mainly by the mold insert. Until now, multi-level mold inserts have been fabricated either by deep etch X-ray lithography and electroforming, Harmening et al. (1992), or by milling of a brass substrate, Schaller et al. (1995). In both cases there are limitations on structuring either by the fabrication effort or by the sizes of the smallest available milling heads. To avoid these limitations on structuring, a new process for manufacturing multi-level mold inserts has been developed at Forschungszentrum Karlsruhe. Milling, drilling, deep etch X-ray lithography and electroforming have been combined to manufacture a mold insert which is characterized by high aspect ratios with small lateral dimensions and various level heights. Samples with two levels and an aspect ratio of 15 have been manufactured. Much higher aspect ratios seem to be achievable. This paper covers the fabrication process, first tests, and experimental results of manufacturing a multi-level mold insert for molding three-dimensional components of a microvalve system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s005420050039
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Die LIGA technik und ihr potential für mikrosysteme (1994)
    Springer
    Naturwissenschaften 81 (1994), S. 536-545 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01139999
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    Paper (German National Licenses)
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