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  • 1
    Electronic Resource
    Electronic Resource
    A new alpha-particle-emitting isotope 259Db (2001)
    Springer
    The European physical journal 10 (2001), S. 21-25 
    Details
    ISSN: 1434-601X
    Keywords: PACS. 21.10.Tg Lifetime – 21.60.Cs Shell model – 27.90.+b A≥ 220
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: An isotope of the element 105 with mass number 259 has been produced via the reaction 241Am(22Ne, 4n)259Db at E lab = 118 MeV. The reaction products were transported and collected using the helium-jet technique and the rotating wheel apparatus. The α-decays of the products and their daughter nuclides were detected by a set of Si(Au) detectors arranged ingeniously. The Z and A of the nuclide have been unambiguously identified by the genetic relationship between the new activity and the known nuclide 255Lr established by α-recoiled milking measurement. The new nuclide 259Db has a half-life of 0.51±0.16 s and decays by alpha-particle emission of E α = 9.47 MeV. Furthermore, the nuclide 258Db and its daughter 254Lr have also been clearly observed using the same projectile-target combination. Their half-lives and α-particle energies determined in this work are in agreement with previous known data, thus also proving the reliability of our assignment of 259Db.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500170140
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  • 2
    Electronic Resource
    Electronic Resource
    Decay of the very neutron-deficient isotope 131Pm (1999)
    Springer
    The European physical journal 6 (1999), S. 59-61 
    Details
    ISSN: 1434-601X
    Keywords: PACS: 27.60.+j 90 〈 A 〈 149 – 21.10.Tg Lifetimes – 29.30.Kv X- and γ-ray spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The decay of 131Pm has been investigated by means of γ-ray spectroscopy. The 131Pm nuclei were produced by fusion-evaporation reaction of 106Cd(32S,3p4n) at the beam energy of 170 MeV. A helium-jet technique and a tape transport system were used to collect the activities and transfer them to a detecting position for X and γ rays measurement. Two γ rays of 185.0 and 220.0 keV were unambiguously identified to follow the β+ decay of 131Pm by results of X-γ and γ–γ coincidence. A growth-decay feature of the decay curve for 87.8 keV γ-ray of 131Nd confirmed the production of 131Pm nuclei. The half-life of 131Pm was measured to be 6.3 ± 0.8 s. A partial decay scheme of 131Pm is proposed on the basis of X-γ and γ–γ coincidence data in this experiment and the known structure information deduced from in-beam experiments of the daughter nucleus 131Nd.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500050317
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    Paper (German National Licenses)
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