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  • 1990-1994  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Light-particle emission versus evaporation residue formation in collisions of40Ar onnatCa at 30 MeV/u (1993)
    Springer
    The European physical journal 347 (1993), S. 117-122 
    Details
    ISSN: 1434-601X
    Keywords: 25.70.-z
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The closely associated phenomena of preequilibrium emission and evaporation residue formation in fusion-like reactions were studied in central collisions between40Ar andnatCa at 30 MeV/u. Heavy reaction products were taken in coincidence with neutrons and light charged particles. The preequilibrium neutron data agree very well with predictions of a quantal phase-space model which, in addition to the mean field, takes two-body collisions properly into account. Preequilibrium emission ends in thermally equilibrated hot nuclei with an average excitation energy of about 6 MeV/u. The combined results show a striking interrelation between the ‘missing mass’ and light-particle multiplicities: the mass difference between the full compound mass and the observed residues can be explained quantitatively by the emission of only neutrons and light charged particles withZ≦2 during the entire course of energy dissipation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01284678
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Evidence for an absorption effect in neutron emission in the20Ne +58Ni reaction at 30 MeV per nucleon (1990)
    Springer
    The European physical journal 335 (1990), S. 77-85 
    Details
    ISSN: 1434-601X
    Keywords: 25.70. -z
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Neutron energy spectra were analysed at various angles in coincidence with projectile-like fragments in the reaction20Ne +58Ni at 30 MeV per nucleon. The data have been parametrized with a three moving source fit, taking into account the emission from discrete excited states of the coincident light fragments and the recoil effect due to the emission of neutrons by light nuclei. A nucleon-nucleon scattering description of the intermediate velocity source gives good fits to the data. However the necessity of introducing a reabsorption effect in the projectile-like and target-like nuclei for the nucleons from that source is demonstrated by testing the momentum and energy balances in the fitting procedure. The mean free path of nucleons in nuclear matter is determined. A good agreement is then obtained for the lowest momentum transfers where single scattering dominates. For the largest momentum transfer another mechanism such as double scattering or one-body friction must be introduced in order to reproduce the data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01289350
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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