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  • 1
    Electronic Resource
    Electronic Resource
    Co-existing coupling schemes at high spin in Hf (2000)
    Springer
    The European physical journal 8 (2000), S. 165-176 
    Details
    ISSN: 1434-601X
    Keywords: PACS 21.10.-k Properties of nuclei; nuclear energy levels – 23.20.Lv Gamma transitions and level energies – 25.70.-z Low and intermediate energy heavy-ion reactions – 27.70.+q 150≤A≤189
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The nucleus 166Hf has been populated by the reaction 96Zr(74Ge,4n) using a beam energy of 310 MeV. -rays were detected with the EUROBALL III detector array. Fourteen new normal-deformed rotational bands, of which six form coupled pairs, have been observed in 166Hf. Four previously known bands have been extended to considerably higher spin, and configurations of the new bands are proposed. Two different bands have been assigned configurations involving the same orbitals at high spin. The two coupling schemes, deformation and rotation alignment, are discussed in connection with this new observation, which calls for a formulation of co-existing coupling schemes in six-quasiparticle structures involving the same orbitals at high spin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100530050022
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  • 2
    Electronic Resource
    Electronic Resource
    Evaluation of the effect of high-energy proton irradiation treatment on meningiomas by means of 11C-L-methionine PET (2000)
    Springer
    European journal of nuclear medicine 27 (2000), S. 1793-1799 
    Details
    ISSN: 1619-7089
    Keywords: Meningioma 11C-L-methionine Positron emission tomography Stereotactic irradiation Proton beam therapy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. A remnant meningioma of WHO grade I that is located at the base of the skull and is treated with radiotherapy has to be followed up for at least 5–10 years to evaluate the treatment effect and detect recurrence. The tumour has to grow considerably to show detectable volume increase on computed tomography (CT) or magnetic resonance imaging (MRI). Owing to the location at the base of the skull, a small increase in tumour volume may be hazardous. It is thus important to find a method to evaluate treatment effects earlier and potentially detect those tumours that have a tendency to grow. Nineteen patients with intracranial meningiomas were given irradiation with the 180-MeV proton beam at the Svedberg Laboratory, Uppsala, Sweden. The fractionation schedule used was in general a total dose of 24 Gy in four consecutive daily 6-Gy fractions. Serial 11C-L-methionine PET examinations were used to evaluate the effect of stereotactic proton beam treatment. The radioactivity uptake in the tumour was evaluated as the ratio to the uptake in normal brain tissue. The follow-up period thus far is 36 months. In 15 of the 19 patients, 11C-L-methionine uptake was reduced 36 months after irradiation compared with the pre-treatment uptake of the tracer. In the total patient group the average reduction was 19.4%. Our results reveal that proton beam irradiation of meningiomas had an inhibitory effect on the methionine uptake in the meningiomas, although tumour size remained unchanged. The combination of unchanged tumour morphology and a reduction in methionine uptake after irradiation suggests that 11C-L-methionine PET might enable earlier evaluation of the treatment effect than is possible with CT or MRI.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002590000335
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    Paper (German National Licenses)
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