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Precision half-life measurement of .sup.140 La with Ge-detector

  1. 1.
    0185523 - UJF-V 20020023 RIV NL eng J - Článek v odborném periodiku
    Adam, Jindřich - Belov, A. G. - Brandt, R. - Chaloun, P. - Honusek, Milan - Kalinnikov, V. G. - Krivopustov, M. I. - Kulakov, B. A. - Langrock, E. J. - Pronskikh, V. S. - Sosnin, A. N. - Stegailov, V. I. - Tsoupko-Sitnikov, V. M. - Wan, J. S. - Westmeier, W.
    Precision half-life measurement of .sup.140 La with Ge-detector.
    Nuclear Instruments & Methods in Physics Research Section B. Roč. 187, - (2002), s. 419-426. ISSN 0168-583X
    Grant CEP: GA AV ČR KSK1048102
    Klíčová slova: radioastive nuclei * Ge-detectors * half-life measurements
    Kód oboru RIV: BG - Jaderná, atomová a mol. fyzika, urychlovače
    Impakt faktor: 1.158, rok: 2002

    Half-life is one of the fundamental properties od radioactive nuclei, and the presision required for its numerous applications in modern physics sometimes approaches the level of 10.sup.-4 -10.sup.-5. Most part of the T.sub.1/2 measurements performed up to now was made with proportional chambers, and the results were sometimes hardly reproducible within the error limits. Using Ge-detectors for that purpose brought some significant advantages but electronic unit related effects and spectra analysis procedures still remain the sources of the errors influencing the accuracy of the T.sub.1/2 attained. In this work, .sup.140 La sampleswere obtained in the .sup.139 La(n,ç).sup.140 La reastion,employing a microtron as a neutron source and the half-life measurements were performed with a HPGe-detector. Influencing factors such a photopeak and background shape, electronic circuitry dead time and deadtime variations during the measurements, as well as pulse pileup are studied altogether. Values of the .sup.140 La T.sub.1/2 = 1.6808(18) d,ŕ = 0.47749(20) x 10.sub.-5, agreeing within the uncertainities with the most accurate evaluated ones (T.sup.1/2 = 1.6781(3) d,ŕ = 0.47807(9) x 10.sub.-5) (2) were obtained in two series of measurements.
    Trvalý link: http://hdl.handle.net/11104/0081917