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  • 21.60.Cs  (5)
  • 31.30.Gs  (3)
  • 32.80.Dz  (2)
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  • 1
    Digitale Medien
    Digitale Medien
    High-spin states in109Sn and their decay to the ground state (1995)
    Springer
    The European physical journal 351 (1995), S. 123-124 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 23.20.Lv ; 27.60.+j ; 21.60.Cs
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract An extended level scheme of109Sn is presented showing high-spin states up to Ex≈ 8 MeV and spins up toJπ=(41/2+). Their decay to the 5/2+ ground state has been observed identifying a 12.8 keV 7/2+ → 5/2+ transition. A half-life of T1/2=7(1) ns has been measured for the 17/2+ state atE x =2114 keV. The experimental data are compared with the predictions of shell-model calculations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01289517
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  • 2
    Digitale Medien
    Digitale Medien
    Isotope shifts of neutron-deficient gold isotopes with 193≧A≧190 (1985)
    Springer
    The European physical journal 321 (1985), S. 537-547 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 21.10.-k ; 27.80+w ; 31.30.Gs
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The isotope shift between197Au (stable) and the radioactive Au isotopes190Au,191Au,192Au and193Au were determined by resonance fluorescence spectroscopy in the 6s 2 S 1/2–6p 2 P 1/2.λ=267.6nm line. The unstable Au isotopes were produced at the ISOLDE mass separator at CERN. The nuclei were investigated semi on-line in a resonance vessel, heated to 1,400°C. The results areδν 190,197=−11.12(39) GHz,δν 191,197=−9.67(12) GHz,δν 192,197=−8.32(15) GHz,δν 193,197=−6.29(11) GHz, corresponding to a change of the mean-square charge radius byδ〈r 2〉190,197 =0.261(12) fm2,δ〈r 2〉191,197=0.227(5) fm2,δ〈r 2〉192,197=0.195(5) fm2,δ〈r 2〉193,197 =0.148(4) fm2.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01432427
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  • 3
    Digitale Medien
    Digitale Medien
    Shell model structure at100Sn — The nuclides98Ag,103In, and104, 105Sn (1995)
    Springer
    The European physical journal 352 (1995), S. 373-390 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 21.10.Sf ; 21.60.Cs ; 23.20.-g ; 27.60.+j
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The neutron deficient nuclei98Ag,104Sn withT z =2 and103In,105Sn (T z=5/2) were studied in-beam following the reaction of 250 MeV58Ni+50Cr. Neutron and charged particle (p, α) gatedγγ-coincidence spectra were used to identify these nuclei, which are populated with yields between 0.05% and 2% of the total residue cross section, and to determine their level schemes. In a comprehensive shell model study various approaches for the residual interaction were used to describe these newly and several previously studied neutron deficient nuclei. As a result predictions for the neutron single particle energies for100Sn are obtained and used to discuss the next generation of experiments.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01299755
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  • 4
    Digitale Medien
    Digitale Medien
    Resonance ionization mass spectroscopy for trace analysis of neptunium (1993)
    Springer
    Applied physics 56 (1993), S. 275-280 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 32.30.—r ; 32.80.Rm ; 32.80.Dz ; 35.10.Hn
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00325216
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  • 5
    Digitale Medien
    Digitale Medien
    Resonance lonization mass spectroscopy with a pulsed thermal atomic beam (1987)
    Springer
    Applied physics 44 (1987), S. 339-345 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 07.65.Eh ; 32.70.Fw ; 32.80.Dz
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00624601
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  • 6
    Digitale Medien
    Digitale Medien
    γ-decay of the particle-hole states with the highest spins in208Pb (1993)
    Springer
    The European physical journal 344 (1993), S. 363-367 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 21.10.Hw ; 21.60.Cs ; 23.20.Lv ; 25.70.Cd
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract 208Pb has been excited with inelastic heavy ion scattering of 350 MeV64Ni and 420 MeV82Se on a thick208Pb target. Withγ -γ coincidence measurements 2 new decays of the 10+ isomer, namely a 34.5 keVE2-transition to 8 2 + and a 857.7 keVE3 transition to 7− have been found and the wavefunctions of the participating levels deduced. An observed gamma cascade of 295.3, 348.0, 865.4 and 340.2 keV on top of the 10+ isomer is assigned to the particle-hole states with the highest spins 14− 6744.1 keV→13− 6448.9 keV→12+ 6100.9 keV→11+ 5235.6 keV→10+ 4895.4 keV.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01283191
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  • 7
    Digitale Medien
    Digitale Medien
    Nuclear structure study of the neutron deficient cadmium isotopes100, 101, 102Cd (1992)
    Springer
    The European physical journal 344 (1992), S. 1-11 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 21.10.Hw ; 21.10.Ky ; 21.60.Cs ; 23.20.Ck ; 23.20.Lv ; 27.60.+j
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The neutron-deficient nuclei100,101Cd were identified for the first time in — beam following the reactions58Ni +46,48Ti and58Ni +50Cr at 230 MeV and 245 MeV bombarding energy of the58Ni beams. Theγ-decay of the isotopes100,101,102Cd was studied inpγ, ppγ,nγ, nnγ, andnγγ prompt and delayed coincidence spectra. Isomers were found with spin and half life {ie1-01}=8+, T1/2=52(5) ns in100Cd, {ie1-02}=(19/2+), T1/2=4.6(4) ns in101Cd and {ie1-03}=8+, T1/2=56(4) ns in102Cd. In a PAD experiment theg-factor of the {ie1-04}=8+ isomer in100Cd was measured to be g=1.24(6). Using the reaction36Ar +70Ge at 135 MeV energy of the36Ar beam, theg-factor and the quadrupole moment of the {ie1-05}=8+ isomer in102Cd were measured to be g=1.29(3) and Q=87(10) fm2, respectively. The spectroscopic results are discussed within a shell model approach using a100Sn core, which accounts well for the electromagnetic properties of the proton aligned isomers. The structure of the spherical neutron states, dominated by the close lying vd5/2, g7/2 orbitals, and the gradually developing quadrupole collectivity are reproduced by the shell model calculations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01291011
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  • 8
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): 27.80.+w ; 23.20.−g ; 21.60.Cs
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01294516
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  • 9
    Digitale Medien
    Digitale Medien
    Isotope shift and hyperfine structure of stable platinum isotopes (1987)
    Springer
    The European physical journal 7 (1987), S. 193-201 
    Details
    ISSN: 1434-6079
    Schlagwort(e): 31.30.Gs ; 35.10.Fk
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Isotope shift (IS) and hyperfine structure (hfs) measurements have been performed on seven lines of the platinum I spectrum with interference as well as laser fluorescence spectroscopy. In the latter case a frequency-doubled single-mode cw dye laser was applied. The IS of190Pt with a natural abundance of only 0.01% was determined to beδν 190, 192=−38.65(8) mK in theλ306.47 nm transition. The IS parameters and the effective hfs integrals in the configuration (5d+6s)10 were determined in intermediate coupling by a least squares fit of the IS and hfs data with eigenvectors obtained from the platinum fine structure (fs). The results are compared with theoretical values and yield improvedδ〈r 2〉 data.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01384588
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  • 10
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): 31.30.Gs ; 31.50. + w ; 35.10.Fk
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01437259
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