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  • 21
    Electronic Resource
    Electronic Resource
    Alpha decay of the new isotopes 188,189Po (1999)
    Springer
    The European physical journal 6 (1999), S. 381-385 
    Details
    ISSN: 1434-601X
    Keywords: PACS:23.60.+e α decay – 27.70.+q 150 ≤ A ≤ 189 – 27.80.+w 190 ≤ A ≤ 219
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. New neutron-deficient isotopes 188,189Po have been produced in the complete fusion reaction of 52Cr ions with a 142Nd target at the velocity filter SHIP. The evaporation residues were separated in-flight and subsequently identified on the basis of α-γ and α-conversion electron coincidence measurements and of α-α position and time correlations. In 189Po a ground state to ground state α decay with Eα1= 7540(20) keV, T1/2= 5(1) ms and two fine structure α-decays at Eα2= 7264(15) keV and Eα3= 7316(15) keV have been observed. In 188Po (T1/2= 400+200 −150μs) a ground state to ground state α decay at Eα= 7915(25) keV and a fine structure α decay at Eα= 7350(40) keV have been found. Improved data on the α-decay of 189Bi were obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500050359
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  • 22
    Electronic Resource
    Electronic Resource
    The new element 111 (1995)
    Springer
    The European physical journal 350 (1995), S. 281-282 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.Dr ; 23.60.+e ; 25.70.−z ; 27.90.+b
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The new element 111 was produced and unambiguously identified in an experiment at SHIP, GSI Darmstadt. Three nuclei of the isotope272111 were observed in irradiations of209Bi targets with64Ni projectiles of 318 MeV and 320 MeV energy. The cross-sections are (1.7 −1.4 +3.3 ) pb and (3.5 −2.3 +4.6 ) pb, respectively. The nuclei decay by a emission into the new and so far the heaviest isotopes of the elements 109 and 107 with mass numbers A=268 and A=264. Theα-decay chains were followed down to the known nuclei260105 and256Lr.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01291182
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  • 23
    Electronic Resource
    Electronic Resource
    Airborne plutonium monitoring (1984)
    Springer
    Journal of radioanalytical and nuclear chemistry 87 (1984), S. 349-358 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Methods of monitoring low plutonium concentration in the inner and outer atmosphere are analyzed and compared. It is shown that monitors based on the gross alpha counting of air filters are not sensitive enough to measure reliably plutonium activities below 1 MPC. A spectrometric discontinuously operating monitor using a gridded ionization chamber and a membrane filter having 70 cm2 active area is described. Plutonium activities of the order of 0.01 MPC /1 mBq.m−3/ can be measured by the spectrometer at 1 h sampling and 1 h counting time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02166793
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    Paper (German National Licenses)
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