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  • 27.80.+w  (3)
  • 32.70.Fw  (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
    Resonance lonization mass spectroscopy with a pulsed thermal atomic beam (1987)
    Springer
    Applied physics 44 (1987), S. 339-345 
    Details
    ISSN: 1432-0630
    Keywords: 07.65.Eh ; 32.70.Fw ; 32.80.Dz
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Resonance ionization mass spectroscopy (RIMS) and pulsed-laser induced desorption (PLID) have been combined for ultrasensitive detection and spectroscopy of very small samples of refractive elements. The method has been tested and applied to laser spectroscopy of 5×109 atoms (1.5 pg) of195Au (T 1/2= 183d) implanted at the ISOLDE online mass separator with 60 keV into graphite. A pulsed thermal atomic beam was formed by laser desorption with a 10 ns Nd∶Yag laser pulse. Subsequently the atoms were photoionized in a three-colour, three-step resonant excitation to an autoionizing state. The selectivity was enhanced by a time-of-flight measurement of the photo ions. In resonance, one ion was detected per 105 atoms implanted resulting in a gain in detection efficiency by three orders of magnitude in comparison to the use of a continuous atomic beam. In the course of the experiments several unknown autoionizing states were found, and the lifetime of the 6d 2 D 3/2 state of gold was determined to beτ=10.7(6) ns.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00624601
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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
    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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  • 5
    Electronic Resource
    Electronic Resource
    Lifetime measurements of highly excited Rydberg states of strontium I (1993)
    Springer
    The European physical journal 27 (1993), S. 111-114 
    Details
    ISSN: 1434-6079
    Keywords: 32.70.Fw ; 32.80.Rm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Lifetimes of Rydberg states of the triplet-series 5s ns 3 S 1 withn = 19–23, 35 and 5s nd 3 D 3 withn = 18–20, 23–28 in the spectrum of neutral strontium have been determined. Observation of the exponential decay after excitation by a pulsed laser in a fast atomic beam and subsequent state-selective field ionization was employed. The lifetimes of the states of the3 S 1-series show the expectedn*3 dependence on the effective principal quantum number, while the3 D 3-series is disturbed by configuration mixing. Furthermore, state re-populations induced by black-body radiation have been observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01426757
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    Paper (German National Licenses)
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