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首页> 外文期刊>Physical review, C >Analysis of various competing binary and ternary decay processes of the Es-253 nucleus
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Analysis of various competing binary and ternary decay processes of the Es-253 nucleus

机译：ES-253核各种竞争二元和三元衰变过程的分析

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The ground state binary and ternary decays of the Es-253 radioactive nucleus are investigated using the quantum mechanical fragmentation theory (QMFT) based cluster decay models. First, the relative fragmentation of Es-253 is analyzed within the framework of the preformed cluster model (PCM). The PCM-calculated binary fragmentation structure is explored for two types of nuclear potential, i.e., Yukawa plus exponential and proximity potentials. The structure of the fragmentation potential and the location of potential minima are found to be independent of the choice of nuclear potential. It is observed from binary fragmentation structures that alpha(He-4) decay, cluster (Ar-46) emission, heavy particle (Ge-82) radioactivity, and spontaneous fission fragmentation (In-125) are the possible ground state decay modes of the Es-253 nucleus. The competitive emergence of these decay channels is explored by studying the preformation probability P-0, penetrability P, and half-lives T-1/2. The calculated half-lives of alpha and spontaneous fission match nicely with the experimental measurements. Also, the half-lives are predicted for cluster and heavy particle radioactivity, for which experimental verification would be of further interest. Further, an effort is made to explore the possibility of ternary fission (particle accompanied fission) for the decay of the Es-253 nucleus using the three-cluster model (TCM), where He-4 is observed to be the third fragment along with two binary fission fragments. A comparison of relative yields of binary and ternary fission confirm that the probability of the binary fission decay mode is larger than that of ternary fission. Moreover, closed shell effects play a significant role in the symmetric and asymmetric fission of binary and ternary fission, respectively.
机译：利用基于量子力学碎裂理论（QMFT）的团簇衰变模型研究了Es-253放射性核的基态二元和三元衰变。首先，在预制团簇模型（PCM）的框架内分析了Es-253的相对碎片。对两种核势，即Yukawa加指数势和邻近势，探讨了PCM计算的二元碎裂结构。发现碎裂势的结构和势极小值的位置与核势的选择无关。从二元碎裂结构观察到，α（He-4）衰变、团簇（Ar-46）发射、重粒子（Ge-82）放射性和自发裂变碎裂（In-125）是Es-253核的可能基态衰变模式。通过研究预成型概率P-0、穿透性P和半衰期T-1/2，探索了这些衰变通道的竞争性出现。计算出的α和自发裂变的半衰期与实验测量值吻合得很好。此外，还预测了团簇和重粒子放射性的半衰期，对其进行实验验证将具有进一步的意义。此外，还利用三团簇模型（TCM）探索了Es-253核衰变的三元裂变（粒子伴随裂变）可能性，其中观察到He-4是第三个碎片以及两个二元裂变碎片。比较二元和三元裂变的相对产率，证实二元裂变衰变模式的概率大于三元裂变衰变模式的概率。此外，封闭壳效应在二元和三元裂变的对称和不对称裂变中分别起着重要作用。

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