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Fission partition a reflection of shell closures: Decay of 220,224U⁎ at eight excitation energies
Nuclear Physics A ( IF 1.7 ) Pub Date : 2020-09-05 , DOI: 10.1016/j.nuclphysa.2020.122031
Dalip Singh Verma

Decay modes of the compound systems formed in 86Kr + 134,138Ba → 220,224U reactions at eight excitation energies have been compared to explore the influence of shell closures and excitation energy. The mass distributions of the cross-sections have been calculated for the two compound systems by keeping their excitation energies the same. The production cross-section for the light particles, intermediate mass fragments, symmetric and asymmetric fission fragments, total fission fragments, percentage of the cross-section for symmetric and asymmetric fission fragments, the ratio of the cross-sections of the symmetric and asymmetric fission fragments and fission barrier as a function of the incident energy have been compared. The range of the incident energy which corresponds to the high probability of the compound nucleus process has been obtained. Three angular momentum windows have been realized from the variation of the production cross-section for the light particles, intermediate mass fragments, fission fragments and the total fragments as a function of the angular momentum which correspond to the dominance of a reaction mechanism in that window. The shell closures have been reflected in the fission partition and weaken with the increase of the incident energy along with the loss of odd-even effects. The mode of the reaction depends upon the excitation energy and angular momentum of the compound system.



中文翻译:

裂变分区壳封闭件的反射:衰变220224 ü 八点激发能

形成在化合物系统的衰减模式86氪+ 134138巴→ 220224 ù 比较了八种激发能下的反应,以探索壳封闭和激发能的影响。通过使两个复合系统的激发能保持相同,可以计算出横截面的质量分布。轻粒子,中间质量碎片,对称和不对称裂变碎片的生产横截面,总裂变碎片,对称和不对称裂变碎片的横截面百分比,对称和不对称裂变的横截面比率比较了碎片和裂变屏障作为入射能量的函数。已经获得了与复合核过程的高概率相对应的入射能量范围。从轻质颗粒,中间质量碎片,裂变碎片和总碎片的生产横截面的变化,已经实现了三个角动量窗,它们是角动量的函数,对应于该窗口中反应机理的优势。壳封闭已反映在裂变分区中,并随着入射能量的增加以及奇偶效应的损失而减弱。反应的方式取决于复合系统的激发能和角动量。壳封闭已反映在裂变分区中,并随着入射能量的增加以及奇偶效应的损失而减弱。反应的方式取决于复合系统的激发能和角动量。壳封闭已反映在裂变分区中,并随着入射能量的增加以及奇偶效应的损失而减弱。反应的方式取决于复合系统的激发能和角动量。

更新日期:2020-09-10
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