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  • 27.80.+w  (3)
  • 27.70.+q  (2)
  • 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
    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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  • 3
    Electronic Resource
    Electronic Resource
    Lifetimes of excited states in164Hf (1989)
    Springer
    The European physical journal 334 (1989), S. 125-131 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.−k ; 23.20.Ck ; 27.70.+q
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Lifetimes of excited states in164Hf were measured using the Doppler-shift recoil-distance method. Gamma-gamma coincidences at eleven target-stopper distances were measured using the twelve Compton-suppressed Ge-detectors of the OSIRIS spectrometer. From the coincidence spectra the intensities of the Doppler-shifted and unshiftedγ-lines were determined. The quadrupole momentsQ tof transitions within the rotational bands derived from the lifetimes are constant within the experimental uncertainties up to the 18+ state. TheQ tvalue for the transition between the ground- and the neutroni 13 2/2 band (s-band) which is strongly reduced compared to the values of the in-band transitions is used to deduce a band interaction energy of 34 keV ≦V≦57 keV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294213
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  • 4
    Electronic Resource
    Electronic Resource
    High-spin spectroscopy of162Hf (1988)
    Springer
    The European physical journal 329 (1988), S. 289-299 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.Re ; 23.20.Lv ; 27.70.+q
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Excited states in162Hf were investigated up to spinI ≈ 38 using the anti-Comptonspectrometer array HERA with 21 detectors. In addition, some information was obtained on161Hf. The analysis of triple coincidences was crucial for the construction of the level schemes. The results are interpreted within the framework of the cranked shell model and are compared to neighbouring isotopes and isotones, showing Fermi level and deformation effects. The systematic behaviour of the band crossings in the Hf isotopes and theN=90 isotones is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01290234
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Conversion electron measurement of isomeric primary transitions in196, 198, 199, 200, 201Pb (1989)
    Springer
    The European physical journal 333 (1989), S. 281-290 
    Details
    ISSN: 1434-601X
    Keywords: 27.80.+w ; 23.20.−g ; 21.60.Cs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The transition energies of nine low energy primary transitions from high spin isomers in196, 198, 199, 200, 201Pb have been measured with conversion electron spectroscopy usinge − e − ande − γ coincidences.B(E2) values as deduced from the measured lifetimes and transition energies are discussed in terms of seniority shell model configurations and of a quasiparticle Tamm-Dancoff approach using the surface delta interaction. A revised discussion of the effectiveE2 charge in neutron deficient Pb isotopes is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294516
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    Paper (German National Licenses)
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