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Investigation of the cold valley paths for the synthesis of isotopes of Ubh in optimum orientations
Nuclear Physics A ( IF 1.4 ) Pub Date : 2020-12-28 , DOI: 10.1016/j.nuclphysa.2020.122129
Dalip Singh Verma , Kushmakshi

Cold valley paths have been investigated for the synthesis of isotopes of superheavy element Unbihexium using quantum mechanical fragmentation theory, which suggests the fusion of fission fragments belonging to the cold valleys in the potential energy surfaces with at least one spherical closed shell nucleus as the reaction partner for the nuclear synthesis. For the suitability of the cold valley fission fragments for the synthesis of isotopes of Ubh, first the fragmentation potentials, preformation probabilities and fission barriers of the fission fragments of 314Ubh and 326Ubh compound systems in their ground states have been compared by keeping the fragments either in hot or cold optimum orientations. The comparison suggests 138Ba + 176Yb and 132Sn + 194Os reactions in hot optimum orientations for the synthesis of isotopes of Ubh due to their highest values of preformation probabilities, lowest values of the fragmentation potentials and relatively good values of the fission barriers. Also, the reactions 68Ni + 246Cf and 70Ni + 256Cf have been considered for the comparison with 138Ba + 176Yb and 132Sn + 194Os reactions due to their relatively smaller values of the Coulomb potential, higher mass-asymmetry and fission barrier, and shell closures next to 48Ca which has been used in most of the experiments for the synthesis of superheavy elements. Finally, the excitation functions for the neutron evaporation from the compound systems formed in these reactions, the probabilities of the formation and survival of the compound nuclei have been compared to suggest the suitable cold valley paths energies for the synthesis of the isotopes of Ubh.



中文翻译:

最佳取向的Ubh同位素合成的冷谷路径研究

已经研究了利用量子力学碎片理论研究冷谷路径以合成超重元素Unbihexium的同位素的方法,该理论表明,在势能表面上属于冷谷的裂变碎片与至少一个球形闭合壳核作为反应伙伴的融合用于核合成。为了使冷谷裂变碎片适合于Ubh同位素的合成,首先比较了314 Ubh和326 Ubh复合系统的裂变碎片在其基态下的碎裂势,形成概率和裂变屏障在最佳或最冷的方向上。比较结果是138 Ba + 176Yb和132 Sn + 194 Os反应在Ubh同位素的合成的最佳最佳方向上反应,这是由于它们的最高预形成概率值,最低的分裂电位值和相对好的裂变屏障值。同样,考虑将68 Ni + 246 Cf和70 Ni + 256 Cf反应与138 Ba + 176 Yb和132 Sn + 194 Os反应进行比较,因为它们的库仑电势值较小,质量不对称性较高,裂变屏障,旁边有壳体封闭装置48Ca在大多数实验中已用于合成超重元素。最后,比较了在这些反应中形成的化合物系统中子蒸发的激发函数,化合物核的形成和存活的可能性,从而提出了适合于Ubh同位素合成的冷谷路径能量。

更新日期:2021-01-04
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