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Precision half-life measurement of .sup.140 La with Ge-detector
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SYSNO ASEP 0185523 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Ostatní články Title Precision half-life measurement of .sup.140 La with Ge-detector Author(s) Adam, Jindřich (UJF-V) RID
Belov, A. G. (RU)
Brandt, R. (DE)
Chaloun, P. (CZ)
Honusek, Milan (UJF-V)
Kalinnikov, V. G. (RU)
Krivopustov, M. I. (RU)
Kulakov, B. A. (RU)
Langrock, E. J. (DE)
Pronskikh, V. S. (RU)
Sosnin, A. N. (RU)
Stegailov, V. I. (RU)
Tsoupko-Sitnikov, V. M. (RU)
Wan, J. S. (DE)
Westmeier, W. (DE)Source Title Nuclear Instruments & Methods in Physics Research Section B. - : Elsevier - ISSN 0168-583X
Roč. 187, - (2002), s. 419-426Number of pages 8 s. Language eng - English Country NL - Netherlands Keywords radioastive nuclei ; Ge-detectors ; half-life measurements Subject RIV BG - Nuclear, Atomic and Molecular Physics, Colliders R&D Projects KSK1048102 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) Annotation 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. Workplace Nuclear Physics Institute Contact Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Year of Publishing 2003
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