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  • 1985-1989  (3)
  • 25.70.Jj  (2)
  • 23.20.Lv  (1)
  • 28.60.+s  (1)
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  • 1985-1989  (3)
Year
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  • 1
    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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  • 2
    Electronic Resource
    Electronic Resource
    Identification of a 3.2μs isomer in76Rb (1986)
    Springer
    The European physical journal 325 (1986), S. 37-43 
    Details
    ISSN: 1434-601X
    Keywords: 23.20.Lv ; 29.30.Cm ; 28.60.+s
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Fusion evaporation reactions were investigated to search for short lived isomeric states of nuclei near the proton drip line. Gamma spectra were measured, both singles and in delayed coincidence with evaporation residues implanted into a silicon detector after a velocity separation. A short lived activity was measured in the40Ca+40Ca →80Zr* reaction at excitation energies between 55 and 79 MeV. A half-life of 3.20 (10) μs was determined from delayed coincidences between evaporation residues and gamma rays. AtE *=55 MeV the cross section is 9 mb. The activity was assigned to an isomeric state in76Rb by investigation of excitation functions. The isomer decays by emission of four gamma rays with energies of 70.55(5), 101.30(4), 145.11 (5), and 246.32(10) keV. A first level scheme is proposed assigning to the isomeric state an energy of 316.94(7) keV above the ground state. The isomer decaying into the low spin 1(−) ground state band is explained from systematics as a band head of a high spin (4+) (πg9/2,νg9/2) structure. A high hindrance factor of 3×106 forE1 radiation compared to a single particle transition is due possibly to a change of the core particle structure in the transition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294240
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    Paper (German National Licenses)
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  • 3
    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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