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  • 1
    Electronic Resource
    Electronic Resource
    Nuclear spins, magnetic moments and α-decay spectroscopy of long-lived isomeric states in 185Pb (2002)
    Springer
    The European physical journal 14 (2002), S. 63-75 
    Details
    ISSN: 1434-601X
    Keywords: PACS. 27.70.+q 150 ?A? 189 – 23.60.+e Alpha decay – 32.10.Dk Electric and magnetic moments, polarizability – 32.10.Fn Fine and hyperfine structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Alpha-decay properties of the neutron-deficient isotope 185Pb were studied at the PSB-ISOLDE (CERN) on-line mass separator using the resonance ionisation laser ion source (RILIS). The nuclei of interest were produced in a 1.4 GeV proton-induced spallation reaction of a uranium graphite target. In contrast to previous studies, two α-decaying isomeric states were identified in 185Pb. The relative production of the isomers, monitored by their α-counting rates, could be significantly changed when a narrow-bandwidth laser at the RILIS setup was used to scan through the atomic hyperfine structure. Based on the atomic hyperfine structure measurements, along with the systematics for heavier odd-mass lead isotopes, the spin and the parity of these states were interpreted as 3/2- and 13/2+ and their nuclear magnetic moments were deduced. The α-decay energy and half-life value for the I π = 13/2+ isomer are E α = 6408(5) keV, T 1/2 = 4.3(2) s, respectively; while for the I π = 3/2- isomer ( T 1/2 = 6.3(4) s) two α-decays with E α1 = 6288(5) keV, I α1 = 56(2)% and E α2 = 6486(5) keV, I α2 = 44(2)% were observed. By observing prompt α-γ coincidences new information on the low-lying states in the daughter isotope 181Hg was obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epja/iepja1387
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  • 2
    Electronic Resource
    Electronic Resource
    Isomeric and ground-state decay of 215 Bi (2003)
    Springer
    The European physical journal 18 (2003), S. 31-37 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. A new high-spin isomer in 215Bi, with a half-life of 36.9(6) s, has been identified at the PSB-ISOLDE on-line mass separator using the pulsed-release technique combined with the element selective RILIS source. A decay scheme of $^{215{\rm m}}$ Bi was constructed and complemented with the low-spinstructure observed in $^{215{\rm g}}$ Bi decay. The population of a cascade on top of the $\left( \nu g_{9/2} \right)^5_{9/2+}$ level in 215Poprovides evidence for Gamow-Teller $\beta$ -decay of the high-spin 215Bi isomer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epja/i2003-10066-6
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  • 3
    Electronic Resource
    Electronic Resource
    MR visualization of the popliteomeniscal fascicles (1999)
    Springer
    Skeletal radiology 28 (1999), S. 561-566 
    Details
    ISSN: 1432-2161
    Keywords: Key words Knee anatomy ; Knee MRI ; Meniscal fascicles ; Lateral meniscus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Objective. Although the popliteomeniscal fascicles are important stabilizers of the lateral meniscus, there have been few studies of their MR appearance. We wished to determine: (1) whether the fascicles are normally seen on MR imaging, and (2) whether certain imaging factors influenced their visualization. Design and patients. We reviewed the sagittal MR images of 66 consecutive patients who had no evidence of injury to the lateral compartment. We determined the frequencies of MR visualization of the superior and inferior popliteomeniscal fascicles, and whether visualization was affected by the weighting of spin echo sequences, the presence of a joint effusion, slice placement relative to the fascicles, and windowing of the images. Results and conclusions. Both popliteomeniscal fascicles were seen in 64 of the 66 patients. The fascicles were better seen on T2-weighted images than on proton-density weighted images (P〈0.01). On the T2-weighted images, fascicle visualization was not significantly affected by the presence or absence of an effusion, slice placement or image windowing (P=0.2 to 1.0). On proton-density weighted images, fascicle visualization was significantly improved when high-contrast windowing was used (P=0.04). In conclusion, we found that the popliteomeniscal fascicles are normally seen on MR imaging of the knee when there are no lateral compartment injuries. The fascicles are significantly better visualized on T2-weighted than on proton-density weighted images. Visualization is not significantly affected by the presence of an effusion or slice placement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002560050619
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  • 4
    Electronic Resource
    Electronic Resource
    Cyclodimerisation reactions of conjugated dienes with aldehydes - I:We dedicate this work to the late Mr Theo Lefèvre, our former Minister for Scientific Programmation. Formation of tetrahydropyrans and their 300 MHz 1H NMR spectra (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 589-591 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The palladium catalysed reaction of butadiene with aldehydes yields 2-substituted 3,6-divinyl-tetrahydropyrans.1-4 The reaction has been extended to isoprene and myrcene. With formaldehyde only 2,5-substituted pyrans have been isolated. The isomeric tetrahydropyrans obtained were fully characterised by 1H NMR, and representative 300 MHz spectra are given. Attempts to react aldehydes with 2-methoxybutadiene were unsuccessful.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270051208
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