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  • 1990-1994  (3)
  • 1994  (2)
  • 1993  (1)
  • 27.80.+w  (1)
  • 34.50.−s  (1)
  • 35.10.Hn  (1)
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  • 1990-1994  (3)
Year
  • 1994  (2)
  • 1993  (1)
  • 1991  (1)
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Spectroscopy of198,199Po (1994)
    Springer
    The European physical journal 350 (1994), S. 207-214 
    Details
    ISSN: 1434-601X
    Keywords: 27.80.+w
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Excited states in198,199Po have been studied by in-beamγ-ray spectroscopy. These nuclei were produced in the 4n and 5n reaction channels for 115 MeV20Ne on183W-targets. Multipolarities and mixing ratios ofγ-transitions were determined from DCO-ratios, leading to spin/parity assignments. In198Po,γ-cascades have been observed above several excited levels that are similar to the vibration-like structure built on the ground state. In199Po, the coupling of the oddi13/2 neutron seems to favor the spherical shape of the even core; no levels resembling the intruder states of the even nuclei are found. A semi-quantitative evaluation of the cross-sections for nuclei produced in fission and multi-particle transfer is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01289584
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Resonance ionization mass spectroscopy for trace analysis of neptunium (1993)
    Springer
    Applied physics 56 (1993), S. 275-280 
    Details
    ISSN: 1432-0649
    Keywords: 32.30.—r ; 32.80.Rm ; 32.80.Dz ; 35.10.Hn
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Resonance ionization mass spectroscopic (RIMS) measurements for trace analysis and spectroscopy of 237Np, the ecologically most important isotope of neptunium, are described. The chemical procedure for the separation of neptunium from aqueous samples as well as the preparation of filaments for RIMS are outlined. Several two- and three-step excitation schemes have been investigated in order to find suitable conditions for the sensitive detection of 237Np. Using a three-step, three-color excitation and ionization scheme an overall detection efficiency of 3×10−8 was obtained, resulting in a detection limit of 4×108 atoms (160 fg) of 237Np. The hyperfine structure splittings of the levels under investigation, which influence the detection limit, were measured. A new method to determine the first ionization potential (IP) was applied to neptunium yielding a value of IP=6.2655(2) eV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00325216
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Collision induced dissociation of stored gold cluster ions (1994)
    Springer
    The European physical journal 30 (1994), S. 341-348 
    Details
    ISSN: 1434-6079
    Keywords: 36.40.+d ; 34.50.−s ; 35.20.Gs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The stability of gold cluster ions Au n + (2≦n≦23) has been investigated via collision induced dissociation in a Penning trap. Threshold energies and dissociation channels have been determined. The cluster stability exhibits a pronounced odd — even alternation: Clusters with an odd number of atoms,n, are more stable than the even-numbered ones. Enhanced stabilities are found for Au 3 + , Au 9 + , and Au 19 + in accordance with the Clemenger-Nilsson and the deformed jellium model of delocalized valence electrons. Excited odd cluster ions withn≦15 predominantly decay by evaporation of dimers; all others decay by monomer evaporation. From the dissociation channels estimates of the binding energies are deduced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01426399
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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