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首页> 外文期刊>Nuclear Physics, A: Journal Devoted to the Experimental Study of the Fundamental Constituents of Matter and Their Actions >Calculations of fission rates for r-process nucleosynthesis
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Calculations of fission rates for r-process nucleosynthesis

机译：r-过程核合成的裂变速率计算

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摘要

Fission plays an important role in the r-process which is responsible; not only for the yields of transuranium isotopes, but may have a strong influence on the formation of the majority of heavy nuclei due to fission recycling. We present calculations of beta-delayed and neutron-induced fission rates, taking into account different fission barriers predictions and mass formulae. It is shown that an increase of fission barriers results naturally in a reduction of fission rates, but that nevertheless fission leads to the termination of the r-process. Furthermore, it is discussed that the probability of triple fission could be high for A > 260 and have an effect on the formation of the abundances of heavy nuclei. Fission after beta-delayed neutron emission is discussed as well as different aspects of the influence of fission upon r-process calculations. (C) 2004 Elsevier B.V. All rights reserved.
机译：裂变在负责的r过程中起着重要的作用。不仅对于铀的同位素产量而言，而且由于裂变再循环，可能对大多数重核的形成产生强大影响。考虑到不同的裂变壁垒预测和质量公式，我们介绍了β延迟和中子诱发的裂变速率的计算。结果表明，裂变势垒的增加自然会导致裂变速率的降低，但是裂变却导致r过程的终止。此外，讨论了当A> 260时三次裂变的可能性可能很高，并且对重核丰度的形成有影响。讨论了β延迟中子发射后的裂变，以及裂变对r过程计算的影响的不同方面。 （C）2004 Elsevier B.V.保留所有权利。

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