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  • 27.40.+Z  (1)
  • Best. von Blei  (1)
  • Springer  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Total charge-changing cross sections for neutron-deficient isotopes from58Ni fragmentation (1995)
    Springer
    The European physical journal 352 (1995), S. 69-75 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.Ft ; 25.70.Np ; 27.40.+Z
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract At the projectile-fragment separator FRS of GSI, relativistic secondary beams of about 520 MeV/nucleon were produced by fragmentation of a primary beam of58Ni at 650 MeV/nucleon in a beryllium target. By means of aΔE—Bρ—TOF measurement, the fragments have been identified and their charge-changing probabilities in targets of CH2, C, Al, and Pb have been determined. We describe the results for the total charge-changing cross sections in this first paper, whereas a second article deals with the partial charge-changing cross sections. At the drip line, the measured charge-changing cross sections exhaust close to 100% of the total interaction cross sections as calculated with semiempirical models. The measurements at the proton drip line with low-Z targets indicate that only a very small increase of the cross sections may be observed, whereas the measurements with a lead target show that no significant increase of the total charge-changing cross sections is present which would be a hint for low-lying dipole strength. Our experimental data are compared to Glauber-type calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01292761
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  • 2
    Electronic Resource
    Electronic Resource
    Neutronenaktivierungsanalyse kurzlebiger Nuklide mit Impuls- und Dauerbestrahlung (1974)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 272 (1974), S. 337-340 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Blei ; Aktivierungsanalyse, Neutronen ; kurzlebiges Pb-207 m
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Für die neutronenaktivierungsanalytische Bestimmung von Blei bietet sich nur das 0,8 s 207mPb an. Unter Verwendung einer schnellen Rohrpostanlage wurde deshalb untersucht, welche Empfindlichkeiten bei Dauer- und Impulsbestrahlungen im Reaktor zu erzielen sind. Dabei zeigte sich, daß unter idealen Bedingungen mit Impulsbestrahlungen noch 1 μg Blei gut zu erfassen ist, während bei Dauerbestrahlung sich eine Nachweisgrenze von 50 μg Blei ergibt. Bei den zu untersuchenden Proben verschob sich durch die matrixbedingte Totzeit dieses Verhältnis jedoch so, daß die Empfindlichkeitsgrenze sowohl für Dauer- als auch Impulsbestrahlung bei etwa 100 μg Blei lag.
    Notes: Abstract The only useful nuclide for neutron activation of lead is the 0.8 s 207mPb. Therefore, using a fast pneumatic transfer system, the sensitivities obtainable in steady state and pulse irradiation in a nuclear reactor were investigated. It turned out that under ideal conditions 1 μg lead is still easily measurable, whereas for steady state irradiation a sensitivity of 50 μg lead was found. However, for the samples to be investigated the dead-time caused by the matrix effected a shift of this relation in such a way that the sensitivity for steady state and pulse irradiation was about 100 μg lead.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00424018
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