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  • Electronic Resource  (3)
  • 25.70.Lm  (1)
  • 25.70.Np  (1)
  • 27.60.+j  (1)
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  • Electronic Resource  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Subthreshold antiproton andK − production in heavy ion collisions (1994)
    Springer
    The European physical journal 350 (1994), S. 101-113 
    Details
    ISSN: 1434-601X
    Keywords: 25.70.Np
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Subthreshold ¯p andK − and energeticπ − production was studied in Ne + NaF, Cu, Sn and Bi, and in Ni + Ni collisions with incident energies between 1.6 and 2 GeV/u. The measured cross sections indicate a dominant contribution of baryonic resonances. This is also consistent with a generalized scaling behaviour of the cross sections with the energy available in the collision and the energy necessary to produce particles as observed with Ne induced reactions. Deviations from scaling especially pronounced in the Ni-Ni system will be discussed in terms of absorption effects. The flat slope of the excitation function for ¯p production can be related to a reduced production threshold caused by a reduction of the antiproton mass in the dense and heated medium by about 100—150 MeV/c2. A similar in-medium mass reduction is also indicated forK − mesons. An increased ¯p reabsorption probability for the heavier systems is concluded from the comparison of the ¯p yields in Ne + NaF, Ne + Sn and Ni + Ni collisions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01290678
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Groundstate proton radioactivity of nuclei in the tin region (1987)
    Springer
    The European physical journal 326 (1987), S. 107-119 
    Details
    ISSN: 1434-601X
    Keywords: 23.90.+w ; 27.60.+j
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Proton radioactivities with decay energies of (0.98±0.08) MeV and (0.83±0.08) MeV were produced by the fusion reactions58Ni+58Ni→116Ba ⋆ and58Ni+54Fe→112Xe ⋆, and their halflives were measured to be (33±7) μs and (109±17) μs, respectively. The intensities of the lines correspond to production cross sections of about 30 μb and 40 μb. The two activities are assigned to the direct proton decay of113Cs and109I. The measured halflives are compared with values calculated ford 5/2 andg 7/2 groundstates of109I and113Cs and spectroscopic factors are deduced for the decays. An extensive search for the proton decay of105Sb, produced in the reaction50Cr(58Ni,p2 n)105Sb, had a negative result, excluding decay energies between 0.5 MeV and 1.5 MeV for halflives between 10 ns and 5 s.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294577
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Excitation-energy sharing in uranium induced dissipative collisions (1990)
    Springer
    The European physical journal 336 (1990), S. 217-222 
    Details
    ISSN: 1434-601X
    Keywords: 25.70.Lm ; 25.85.Ge
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Strongly damped collisions were studied in uranium induced reactions on110Pd and124Sn target nuclei near the barrier. The excitation-energy splitting was deduced from binary reaction yields and those in which the heavy fragment undergoes sequential fission. For systems with 87≦Z≦95 for the heavy fragment, the excitation energy is concentrated in the lighter nucleus, at best shared equally. The results indicate a non-equilibrated energy dissipation, and support nucleon exchange based on average single-particle strength functions as the underlying dissipation mechanism at the barrier.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01290623
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    Paper (German National Licenses)
    Fulltext
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