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  • 1990-1994  (4)
  • 27.80.+w  (2)
  • 31.30.Gs
  • 32.80.Dz
  • 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)
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  • 3
    Electronic Resource
    Electronic Resource
    Quadrupole and octupole collectivity in light Po isotopes (1991)
    Springer
    The European physical journal 339 (1991), S. 225-229 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.−k ; 23.20.Ck ; 27.80.+w
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The level structure of196Po has been studied using a160Dy(40Ar, 4n) reaction and a recoil-catcher technique to reduce fission. The results showed a sharp drop off in the first (2+) and (4+) energies relative to systematics implying an abrupt increase in the quadrupole collectivity at N=112. In addition, second (2+) and(4+) states were identified at 859 and 1388 keV, respectively, suggesting the discovery of a 4p2h deformed band in Po isotopes which is related to known 2p2h proton bands in several Pb isotopes. A prompt183W(20Ne, 5n@#@) experiment located similar second 2+ and 4+ states at 1039 and 1483 keV in198Po providing corroboration and extended information on the properties of the new Po deformed bands. A measured halflife of 850 (90) ns for the 2491 keV (11−) state in196Po implied collective E3 contributions to the extractedB (@#@ E3; 11−→8+)=27(5) W.u.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01284056
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Hyperfine structure in 5s 4d 3 D —5snf transitions of87Sr (1993)
    Springer
    The European physical journal 28 (1993), S. 275-281 
    Details
    ISSN: 1434-6079
    Keywords: 31.30.Gs ; 31.50. + w ; 35.10.Fk
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The hyperfine spectra of the 5s4d 3 D 1-5s20f, 5s4d 3 D 2-5s23f, and 5s 4d 3 D 3-5s32f transitions of87Sr (I=9/2) have been measured by collinear fast beam laser spectroscopy. The structure in the upper configurations is highly perturbed by fine structure splitting that is of comparable size to the hyperfine interaction energy. These perturbations can be adequately treated with conventional matrix diagonalization methods, using the 5s-electron magnetic dipole interaction terma 5s and the unperturbed fine structure splittings as input parameters. Additionally, hyperfine constants for the lower 5s4d 3 D configurations, including theA- andB-factors and a separation of the individuals- andd-electron contributions to these factors, are derived.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01437259
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    Paper (German National Licenses)
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