Yield ratio for the two 241Pu fission isomers in the 242(γ, n) reaction |
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Authors: | W Günther K Huber U Kneissl H Krieger H Ries H Ströher W Wilke |
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Institution: | Institut für Kernphysik, Strahlenzentrum der Justus-Liebig-Universität Giessen, D-6300 Giessen, Germany |
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Abstract: | The half-lives and yield ratios for the two 241Pu fission isomers have been measured in the 242Pu(γ, n) reaction. The observed half-life for the long-lived isomer is in agreement with previous data, and the existence of a short-lived 34 ± 7 ns isomer in 241Pu could be confirmed. The measured yield ratios are Yiso/Ypr = (9.2 ± 0.8) × 10?5 and Yiso/Ypr = (3.7 ± 0.7) × 10?5, respectively. From a statistical model analysis of the isomeric fission yield ratio, Ylongiso/Yshortiso = 2.5 ± 0.6, a spin assignment for the two isomers is attempted. Possible spin combinations are compared with single-particle shell-model calculations and with available spectroscopic data for the other even-odd Pu isotopes. |
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Keywords: | Nuclear reactions |
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