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  • 23.20.Lv  (1)
  • 23.60.+e  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Element 107 (1989)
    Springer
    The European physical journal 333 (1989), S. 163-175 
    Details
    ISSN: 1434-601X
    Keywords: 23.60.+e ; 25.70.3f ; 25.85.Ca ; 27.9.+6
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We identified twoα-emitting isotopes of element 107 with masses of 261 and 262 respectively by parent-daughter correlations. For the isotope with mass 262 we found two transitions with (102±26) ms and (8.0±2.1) ms half-life, which we assign to the groundstate and to an isomeric transition, respectively. The half-life of the isotope with mass 261 is (11.8 −2.8 +5.3 ) ms. Spontaneous fission, which could be assigned to the decay of an isotope of element 107, was not detected in our experiments. This observation is in-line with our previous results, indicating a region of nuclei with strong microscopic stabilisation in the trans-actinides. Both new isotopes were produced by complete fusion of209Bi with54Cr. The production cross sections are (163±34) pb for262107 and (36 −14 +22 ) pb for261107.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01565147
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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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