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  • 1985-1989  (5)
  • 1980-1984  (11)
  • 1975-1979  (3)
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Years
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Use of paraffins as negative-acting electron-sensitive resists (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 1056-1057 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of generating crosslinks in paraffins by electron impact was utilized to apply these aliphatic hydrocarbons as negative-acting electron-sensitive resists, capable of high structural resolution, anticipated from their low molecular weight. Owing to their chemical stability and relatively high vapor pressure above the melting point, paraffins may be vacuum deposited as thin uniform resist layers. The developing process makes use of the lower vapor pressure of the crosslinked material remaining on the substrate being heated to sublime the unexposed material in vacuum, thus completing an all-dry process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.336312
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Scanning tunneling microscope combined with a scanning electron microscope (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 221-224 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have developed a small scanning tunneling microscope (STM) to be incorporated into a scanning electron microscope (SEM). Vibration isolation and damping is achieved solely with Viton dampers. As a stand-alone unit, a tunnel-gap stability of about 1 A(ring) is reached at atmospheric air pressure without additional sound protection. Stability improves by at least an order of magnitude when incorporated into a SEM.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138973
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A new approach to minimizing the number of animals used in acute toxicity testing and optimizing the information of test results (1982)
    Springer
    Archives of toxicology 51 (1982), S. 197-220 
    Details
    ISSN: 1432-0738
    Keywords: Acute toxicity ; LD50 method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract 170 acute toxicity determinations, carried out in rats, mice, and guinea pigs after oral and parenteral administration during the past 5 years, using 5 ♂/5 ♀ animals per dose, were evaluated with respect to the possibility of a reduction of animals necessary for obtaining LD50 values with limits of confidence. Calculations were performed on existing data; no additional animal experiments were initiated for the purpose of this paper. For the majority of substances 3 ♂/3 ♀ animals per dose would have sufficed for the determination of a LD50 value with limits of confidence. Even when using 2 ♂/2 ♀ animals per dose, in most cases sufficently acceptable LD50 values can be determined, if the period of observation — conventionally 4 weeks — would be doubled. Using this procedure, 75% of the animals could be saved. The reduced number of animals and the labor saved thereby would allow for a more individualized observation of single animals thus optimizing the evaluation of acute toxicity testing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00348853
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Fusion-fission of heavy systems (1988)
    Springer
    The European physical journal 330 (1988), S. 295-301 
    Details
    ISSN: 1434-601X
    Keywords: 25.70.Jj
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The influence of the entrance channel on fission processes was studied by forming the same composite system by two different target-projectile combinations (40Ar+209Bi and56Fe+187Re, respectively). Compound nucleus fission and quasi fission were observed and the analysis was performed in the framework of the extra-extra-push model, which provides a qualitative interpretation of the results; limits for the extra-extra-push threshold are given, but problems with quantitative predictions for the extra-push are noted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294873
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  • 5
    Electronic Resource
    Electronic Resource
    Incomplete deep-inelastic scattering in20Ne+197Au collisions at 20 MeV/nucleon (1988)
    Springer
    The European physical journal 330 (1988), S. 303-310 
    Details
    ISSN: 1434-601X
    Keywords: 25.70.Lm ; 25.70.Np
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Correlations between emission angles and energies of coincidentα-particle projectile-fragment pairs have been measured for the20Ne+197Au system at 390 MeV beam energy. Theα-particles observed close to the direction of the projectile-like fragment were found to result essentially from sequential projectile decay. Starting from the close-geometry data, the contribution of sequentially emittedα-particles was calculated by Monte Carlo simulations for the entire angular range. For deep inelastic events, the measured angular correlations exhibit a spectacular excess over the calculated correlation. This excess is centred close to the beam direction but on the opposite side of it with respect to the detected projectile-like fragment. The correspondingα-particles have velocities around 85% of the projectile velocity indicating emission in an early reaction phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294874
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  • 6
    Electronic Resource
    Electronic Resource
    Search for localization of 'fast fission' in angular momentum (1982)
    Springer
    The European physical journal 309 (1982), S. 183-184 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Mass distributions of fission-like fragments from the system 271 MeV40Ar+165Ho have been measured as a function of the angle. An expected dependence of the mass distribution width on angle due to the claimed contribution of “fast fission” could not be observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01414980
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    ABMR-Ramsey patterns of strongly field dependent transitions of lithium at high magnetic fields (1977)
    Springer
    The European physical journal 282 (1977), S. 249-251 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using the atomic beam magnetic resonance method we observed Ramsey patterns of strongly field dependent transitions of Li, Na and Rb at high magnetic fields. The structures were of high symmetry, with half widths of the central minimums between 20 kHz and 6 kHz. In a first experiment we determined theg J -factor ratiog J (6Li)/g J (7Li)=1+3(70)·10−10.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01414891
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Hyperfine structure measurements in the4 I 9/2 ground state of141Pr (1975)
    Springer
    The European physical journal 274 (1975), S. 195-201 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using the atomic beam magnetic resonance method, the five hyperfine structure separations in the 4f 3 6s 2 4I9/2 ground state of 59 141 Pr have been measured. The results are:F F′ E FF′ * /h (MHz) 7 6 6477.913423(17) 6 5 5556.359848 (6) 5 4 4633.023306 (2) 4 3 3708.201146 (5) 3 2 2782.190601(15) From these quantities, the multipole interaction constantsA k,k=1, 2, 3, 4 between the nucleus and the electron shell have been calculated.A 4 especially then served to give the following limit for the intrinsic hexadecapole moment: ¦Q 40¦〈0.4eb 2. Furthermore, theg J -factors of the4 I multiplet have been measured at magnetic fields of 300 Oe. The results are:g J(4 I 9/2)=0.7310371(15)g J(4 I 11/2)=0.9651476(20)g J(4 I 13/2)=1.1063197(40)g J(4 I 15/2)=1.197963 (30) Small corrections due to perturbations by neighbouring fine structure levels are included.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01437730
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Evidence for shape deformations of fragments in deep inelastic collisions (1980)
    Springer
    The European physical journal 294 (1980), S. 289-290 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The number and energy spectra of neutrons evaporated by the heavy and light fragments in deep inelastic collisions have been obtained for the system 240 MeV40Ar +197Au. They indicate that at the scission point the deformation energy is a large part of the total excitation energy espe cially for the light fragment. In the last two years, neutron emission has been studied in deep inelastic reactions1−6. All the results are similar: the incident energy which is lost during the process is transformed into excitation energy of the final fragments and is shared between the two products proportionnally to their masses. This means that the nuclear temperature was uniform in the composite system. The excitation energy equilibration time is really very short since equilibration is achieved after reaction times as small as 10−22 s2,6. Moreover, no preequilibrium emission (direct neutrons-) has been observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01438169
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  • 10
    Electronic Resource
    Electronic Resource
    Evaporation residue cross sections from the fusion of52Cr+110Pd (1980)
    Springer
    The European physical journal 298 (1980), S. 207-211 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Evaporation residue cross sections for the fusion of52Cr and110Pd were studied at four energies close to the barrier (up toE CM −E B =26 MeV). The cross sections were analysed using a multiple-chance fission/evaporation calculation. Agreement with the data is obtained with a fission barrier reduced by 40 to 20%, depending on incident energy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01418658
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    Paper (German National Licenses)
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