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  • 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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  • 3
    Electronic Resource
    Electronic Resource
    Identification of the neutron-deficient isotopes213,214Pa (1995)
    Springer
    The European physical journal 351 (1995), S. 125-126 
    Details
    ISSN: 1434-601X
    Keywords: 23.60.+e ; 27.90.+b
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Two new neutron-deficient isotopes,213Pa and214Pa were produced in complete fusion reactions of51V-ions with170Er targets at (5.2−5.6) AMeV. The assignment was based on delayed evaporation residue -α -α time and position coincidences. Theα- decay energies of213,214Pa were measured to be Eα=(8236±20) keV and Eα=(8116±20) keV, respectively. The half-lives of213,214Pa were determined to be T1/2=(5.3 −1.6 +4.0 ms and T1/2=(17 ±3) ms, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01289518
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  • 4
    Electronic Resource
    Electronic Resource
    Production and decay of269110 (1995)
    Springer
    The European physical journal 350 (1995), S. 277-280 
    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 In an experiment carried out to identify element 110, we have observed anα-decay chain, that can be unambiguously assigned to269110. In a scries of preexperiments the excitation functions of the fusion reactions50Ti +208Pb→258104* and58Fe +208Pb→266108* were measured with high precision in order to get the optimum projectile energies for the production of these heavy elements. The cross-section maxima of the 1n evaporation channels were observed at excitation energies of 15.6 MeV and 13.4 MeV, respectively. These data result in an optimum excitation energy of 12.3 MeV of the compound nucleus for the production of269110 in the reaction62Ni +208Pb→269110 + 1n. In irradiations at the corresponding beam energy of 311 MeV we have observed a decay chain of 4 subsequent a decays. This can be assigned to the isotope with the mass number 269 of the element 110 on the basis of delayed α-α coincidences. The accurately measured decay data of the daughter isotopes of the elements 108 to 102, obtained in the previous experiments, were used. The isotope269110 decays with a hair-life of (270 -120 +1300 ) μs by emission of (11.132±0.020) MeV alpha particles. The production cross-section is (3.3 -2.7 +6.2 ) pb.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01291181
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  • 5
    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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