Fission and decay of excited nuclei |
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Authors: | V.S. Barashenkov A.S. Iljinov V.D. Toneev F.G. Gereghi |
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Affiliation: | Joint Institute for Nuclear Research, Dubna, USSR;Institute of Applied Physics of the Moldavian Academy of Sciences, Kishinev, USSR |
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Abstract: | The statistical theory of the decay of excited nuclei including the competition between particle emission and fission is considered. Fission barriers are given by a phenomenological formula which is an analog of the known Cameron formula and approximates well experimental data on nuclei up to transuranic elements. The contribution of shell corrections and odd-even effects is discussed. The calculated ratios of evaporation and fission widths Γn/Γf agree with experiment even in the region of nuclei with Z > 90. The values depend weakly on excitation energy for nuclei with Z ≈ 90, While in other regions this dependence proves rather strong. The last conclusion does not contradict known experimental data since in experiments one usually measures some effective value , which is only indirectly related to the real , values. It is shown that the calculated values of depend on excitation energy either. The effects of angular momentum and uncertainty in the choice of level density parameter are discussed. |
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