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  • 1
    Electronic Resource
    Electronic Resource
    Observation of the isotopes264108 and265108 (1987)
    Springer
    The European physical journal 328 (1987), S. 49-59 
    Details
    ISSN: 1434-601X
    Keywords: 23.60.+ e ; 25.70.Jj ; 27.9.+b
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The experiment having led to the discovery of first isotopes of element 108, as published previously in Short Notes to this Journal [1, 2] are described and discussed in a final paper. Two isotopes of element 108 were produced by complete fusion of207Pb and208Pb, respectively, with58Fe. Both isotopes areα-emitters. For the isotope with mass 265 threeα-decay sequences were observed. Theα-decay energy is (10.36±0.03) MeV, the half-life (1.8 −0.7 +2.2 ) ms. For the isotope with mass 264, which is the heaviest doubly even isotope known at present, the decay sequence of one atom was found. The measured half-life is (76 −36 +364 ) μs. Our experimental results point towards an enhanced stability of the heaviest elements against spontaneous fission, which was already observed for element 106.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01295182
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    How well do we understand the synthesis of heavy elements by heavy-ion induced fusion? (1992)
    Springer
    The European physical journal 343 (1992), S. 47-57 
    Details
    ISSN: 1434-601X
    Keywords: 24.60.Dr ; 25.70.Gh ; 25.70.Jj ; 25.85.Ca
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Experimental cross sections to synthesize heavy ion induced fusion reactions are confronted with calculations using the conventional picture of complete fusion after passing the barrier plus statistical deexcitation after complete equilibration. The sensitivity of the calculations to some of the parameters is demonstrated. Despite this sensitivity, a single parameter set is found that reproduces well the large body of data from experiments using actinide targets. By comparison, for the more symmetric entrance channels using targets around208Pb, we find a fusion hindrance that increases steeply with increasing compound nuclear charge. Predictions for a few reactions of future interest for the synthesis of heavy elements are also presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01291597
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The isotopes259106,260106, and261106 (1985)
    Springer
    The European physical journal 322 (1985), S. 227-235 
    Details
    ISSN: 1434-601X
    Keywords: 23.60.+ e ; 25.85.Ca ; 25.70.Jj
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In irradiations of207Pb and208Pb, respectively, with54Cr theα-decay of the isotopes259106,260106, and261106 could be observed for the first time. For260106 a spontaneous fission branch of (50 −20 +30 )% was observed. The isotopes were identified by genetic relationships of α-decay after separation in-flight with the velocity filter SHIP and implantation into a position-sensitive silicon surface-barrier detector. The measured partial fission halflife of the doubly even isotope260106 of (7.2 −2.7 +4.8 )ms exceeds the predicted values by at least a factor of 40. This result could be explained by the high shell corrections of the ground state mass, derived from the measured α-decay energies. The experimental results show evidence for an island of purely shell stabilized nuclei in the region of deformed isotopes beyond the actinides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01411887
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    Paper (German National Licenses)
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