resonances |
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Authors: | F. Hinterberger P.D. Eversheim H.O. Klages M.S. Abdel-Wahab H. Dobiasch B. Haesner G. Schmalz P. Schwarz J. Wilczynski |
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Affiliation: | Institut für Strahlen- und Kernphysik der Universität Bonn, D-5300 Bonn 1, West Germany;Institut für Kernphysik I des Kernforschungszentrums Karlsruhe, D-7500 Karlsruhe, West Germany |
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Abstract: | resonances in 21Ne have been studied in measurements of the total neutron cross section of 20Ne using the 190 m neutron time-of-flight facility of the Karlsruhe Isochronous Cyclotron. The high time-of-flight resolution of 6.6 ps/m enabled the study of sharp resonances in 21Ne with an effective energy resolution of up to 4000. Five levels have been observed as sharp resonances allowing the precise determination of total width Λ, partial decay with Λno and resonance energy ER. The c.m. resonance parameters of the first state in 21Ne are ER = 2098.6 ± 0.3 keV, Λ = 2.2 ± 0.5 keV and Λno = 0.21 ± 0.05 keV. Upper limits for the partial decay widths are deduced for those levels which do not appear as resonance anomalies. A search for additional states was undertaken. The resonance energies are discussed in the framework of the isbobaric mass multiplet equation. The decay widths are compared with shell-model predictions of isospin mixing and the systematics of isospin-non-conserving particle decays. |
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Keywords: | Nuclear reactions |
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