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  • 1980-1984  (4)
  • 1982  (2)
  • 1980  (2)
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  • 1980-1984  (4)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Studies of4He emission in both fusion-like and inelastic reactions of 340-MeV40Ar+238U (1982)
    Springer
    The European physical journal 306 (1982), S. 323-334 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The fission-fragment angular correlation technique has been used in conjunction with a position-sensitive avalanche detector to identify the fusion-like and inelastic collisions of 340-MeV40Ar+238U. For each of these two reaction types, we have characterized the correlated4He emission by measuring three-fold coincidences between two fission fragments and the light charged particle. We find an abundance of both evaporation-like and direct4He emission, each of which is associated with both fusion-fission and sequential-fission processes. Several comparison tests of both the coincidence and singles data strongly indicate that very little4He emission is due to evaporation from accelerated fission fragments in this system. The evaporative4He emission appears instead to have a strong contribution originating from the composite system prior to fission. The forward angle4He emissions, characterized by prominent forward-peaking and relatively high energies, suggest an origin associated with the very early stages of the collision.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01432373
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Correlations between fission fragments and light charged-particles in the reaction20Ne+197Au at 13 MeV/nucleon (1982)
    Springer
    The European physical journal 307 (1982), S. 365-373 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract rgy of light charged-particles has been measured in coincidence with one or two fission fragments in the reaction20Ne+197Au at a bombarding energy of 13 MeV/u. The fission cross section was found equal to 1,340±260 mb. Assuming that it represents the totality of the fusion cross section, the critical valuel c is deduced equal to 93±9ħ, higher thanl Bf=0=74 in the rotating liquid drop model. The main emission source for protons and alpha particles seems to be a thermally equilibrated composite system. The competition between fission and charged particle emission is unexpected in the frame of the statistical treatment. A high energy component is observed in the forward direction. These results correspond to the first step of a study programme on the evolution of nucleus-nucleus collisions between 10 and 100 MeV per nucleon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01421298
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Light particle emission in deeply inelastic collisions of 280 MeV40Ar+58Ni: Thermal equilibrium and angular momentum transfer (1980)
    Springer
    The European physical journal 295 (1980), S. 153-167 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Protons andα-particles emitted in coincidence with a deep inelastic fragment produced in the reaction40Ar (280 MeV)+58Ni have been measured. From a detailed study of their in-plane angular distribution, it is shown that the bulk of the light charged particle emission can be attributed to a secondary evaporation process by the two primary deep inelastic fragments. A lowest estimate of the fragment spin (assuming total alignment perpendicular to the reaction plane) is obtained from the anisotropy of the out-of-plane angular distribution of theα-particles. For very asymmetric splitting, the heavy fragment spin estimate as obtained from theα-anisotropy measurement is consistent with the observed proton toα-particle multiplicity ratio. The results are in agreement with the hypothesis of a sticking configuration between two deformed nuclei.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01413073
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The influence of the entrance channel mass asymmetry on the reaction mechanism (1980)
    Springer
    The European physical journal 296 (1980), S. 287-294 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have tried to investigate the influence of the entrance channel mass asymmetry on the reaction mechanisms associated with heavy ion collisions. Two systems, one very much asymmetric (O+Mo) and the other one almost symmetric (Cr+Fe), were studied in detail by measuring evaporation residues, deep inelastic collision products and fission fragments. An important fraction of the fragments observed in the Cr+Fe system exhibits all the characteristics of fission fragments. The analysis of these data seems to indicate that these fission like products are most likely emitted by a long lived composite system having not reached full statistical equilibrium for all the degrees of freedom. As a consequence, the fusion cross section for this symmetric system is too low as compared to predictions based on a critical distance approach for fusion, whereas the asymmetric system (O+Mo) is well understood in term of the same model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01438522
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    Paper (German National Licenses)
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