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  • PACS. 23.60.+e Alpha decay – 25.70.Jj Fusion and fusion-fission reactions – 25.85.Ca Spontaneous fission – 23.20.Lv Gamma transitions and level energies  (1)
  • PACS. 23.60.+e α decay – 27.90.+b 220 ≤A  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Decay properties of neutron-deficient isotopes 256, 257Db, 255Rf, 252, 253Lr (2001)
    Springer
    The European physical journal 12 (2001), S. 57-67 
    Details
    ISSN: 1434-601X
    Keywords: PACS. 23.60.+e Alpha decay – 25.70.Jj Fusion and fusion-fission reactions – 25.85.Ca Spontaneous fission – 23.20.Lv Gamma transitions and level energies
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. Isotopes of dubnium (element 105) with mass numbers A = 256, 257, and 258 were produced by the reaction 209Bi(50Ti,xn) 259-xDb (x = 1, 2, 3) at projectile energies of (4.59-5.08) AMeV. Excitation functions were measured for the 1n, 2n and 3n evaporation channels. The same position of the excitation function was observed for the 1n channel as for the previously measured 1n channel of the reaction 208Pb(50Ti,1n)257Rf. The measured α-decay data of 257Db and its daughter products resulted in the identification of α-decaying isomeric states in 257Db and 253Lr. Two new isotopes, 256Db and 252Lr, were produced at the highest bombarding energies of 4.97 AMeV and 5.08 AMeV. They were identified by delayed α-α coincidences. The measured half-lives are (1.6+0.5 -0.3) s for 256Db and (0.36+0.11 -0.07) s for 252Lr. Besides α-decay, a spontaneous fission activity of T 1/2 = (2.3+1.1 -0.6) s was observed and attributed to an electron-capture branch of 256Db, which feeds the fissioning nucleus 256Rf. A branching ratio of 0.36±0.12 was obtained. The isotope 255Rf was produced by the reaction 207Pb(50Ti,2n)255Rf. Improved decay data have been obtained by means of α- and α-γ spectroscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500170039
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  • 2
    Electronic Resource
    Electronic Resource
    Decay properties of neutron-deficient nuclei in the region Z = 86-92 (2000)
    Springer
    The European physical journal 8 (2000), S. 521-535 
    Details
    ISSN: 1434-601X
    Keywords: PACS. 23.60.+e α decay – 27.90.+b 220 ≤A
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Neutron deficient isotopes of elements Z = 86-92 have been produced by heavy-ion fusion reactions 12C + 208Pb, 209Bi, 22Ne + 208Pb, 51V + 170Er, and 50Ti + 170Er. The evaporation residues were investigated by means of α- and α-γ-spectroscopy after in-flight separation from the projectile beam by the velocity filter SHIP and implantation into a 16-strip position-sensitive Si-detector. New or improved decay data for 225, 226U, 216, 217m, 218Pa, 215, 216, 217Th, 214, 215, 216, 216mAc, 214Ra and 213Rn have been obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500070075
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    Paper (German National Licenses)
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