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  • 25.70.CD  (3)
  • 74.25 Fy  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Cross sections for nuclear reactions in collisions of238U+238U and238U +197Au near and below the coulomb barrier (1991)
    Springer
    The European physical journal 340 (1991), S. 303-314 
    Details
    ISSN: 1434-601X
    Keywords: 25.70.CD ; 25.70.Lm ; 25.85.−W
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Cross sections for nuclear reactions at beam energies near and below the spherical Coulomb barrier V c were measured in the very heavy collision systems238U +238U and238U +197Au. The most probable reaction channel with mass transfer is the one-neutron transfer. Its excitation function is understood in terms of Rutherford trajectories together with the quantal process of neutron tunnelling over large distances. In addition, the exchange of up to 15 nucleons is observed down to 0.90 V c . The excitation functions for the multi-nucleon transfer products have much steeper slopes than that for one-neutron transfer, and are steeper for238U +197Au than for238U +238U, suggesting that nuclear contact is established in the associated collisions. The angular distribution for one selected multi-nucleon transfer product,227Th, shows that its formation occurs in more central collisions within contact times shorter than about 10−21 s. There is no evidence for very longlived di-nuclear systems in the these reactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294679
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  • 2
    Electronic Resource
    Electronic Resource
    Fission in238U+238U collisions below the Coulomb barrier (1988)
    Springer
    The European physical journal 330 (1988), S. 87-92 
    Details
    ISSN: 1434-601X
    Keywords: 25.70.CD ; 25.85.-W
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Integral fission cross sections in the system238U+238U were measured at beam energies below the interaction barrierV C. Scattering angle dependent probabilities and integral cross sections for Coulomb fission were calculated. It is concluded that earlier observed discrepancies between measured and calculated angular distributions for the one-neutron transfer product239U cannot be explained by sequential fission. Multi-nucleon transfer induced fission is observed down to energies (0.90±0.02)×VC.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01287269
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  • 3
    Electronic Resource
    Electronic Resource
    Reactions of40Ar with233U,235U, and238U at the barrier (1990)
    Springer
    The European physical journal 335 (1990), S. 421-430 
    Details
    ISSN: 1434-601X
    Keywords: 25.70.CD ; 25.70.JJ ; 25.70.LM
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Production cross sections for target-like transfer products in reactions of40Ar with233,235,238U at the barrier were determined using radiochemical techniques. The heaviest products detected are isotopes of californium (Z=98). In addition to the quasi-elastic component of the isotopic distributions observed in the vicinity of uranium, there are also relaxed contributions throughout the entire region. The peak positions of the isotope distributions of this component for fixed atomic number, after the transfer of 〉 3 charges, approach closely the minimum of the potential energy surfaces (PES). The experimental results thus indicate the cold formation of the reaction products. A search for long-lived heavy actinides produced, by fusion-evaporation, via isotopes of element 110 and their subsequent decay through α-decay chains, remained unsuccessful at a cross section limit of 21 pb.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01290190
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  • 4
    Electronic Resource
    Electronic Resource
    Vortex dynamics in Bi2Sr2CaCu2O8-thin films in the presence of columnar defects (1996)
    Springer
    Journal of low temperature physics 105 (1996), S. 1153-1158 
    Details
    ISSN: 1573-7357
    Keywords: 74.25 Fy ; 74.60 Ge ; 74.60 Jg ; 74.72 Hs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract With heavy ion irradiation we create continous amorphous columnar defects in Bi2Sr2CaCu2O8-thin films. With regard to a reliable comparison of irradiation effects three of four identical striplines on the same samples were exposed to different irradiation procedures. We performed irradiations as well parallel as under different angles with respect to the film $$\vec c$$ -axis. Beside an enlarged normal state resistivity after irradiation the films suffer a Tc-reduction proportional to the volume of the damaged material. The activation energy ascertained from resistive transitions shows best enhancement for magnetic field values close to the matching field. Measurements of the transport critical current density, the activation energy and the irreversibility field in different field orientations show no anisotropic flux pinning due to the induced columnar defects. This can be explained by the two dimensional behaviour of the Bi2Sr2CaCu2O8-thin films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00753855
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    Paper (German National Licenses)
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