论文标题
融合蒸发反应中Z = 119-120的新的超重元素的生产横截面
Production cross-sections of new superheavy elements with Z = 119-120 in fusion-evaporation reactions
论文作者
论文摘要
我们已经计算了新的超高元素的生产横截面，其原子数为z = 119,120 $^{48} $^{48} $ CA+$^{252} $ es，$^{48} $ ca+$+$+$^{257} $^{257}美元$^{54} $ cr+$^{243} $ am，$^{54} $ cr+$^{247} $ cm，$^{56} $ mn+$^{244} $^{244} $^{56}美元$^{65} $ cu+$^{232} $ th，$^{65} $ cu+$^{231} $ pa，$^{68} $ zn+$^{232} $在dinuclear系统模型中。内部融合屏障已从驱动势或势能表面提取，可用于预测相对融合概率。碰撞伙伴的质量不对称性对新超级元素（SHE）的生产的影响已进行了系统的研究。发现融合概率随着碰撞系统的不对称性增加而增加。 Ti引起的反应是新SHE的最大横截面。已经讨论了新超重量元件对弹丸核的同胞素的横截面的依赖性。 $^{289-295} $ 119的新She被预测为$^{46,48,50,52} $ ti诱导的反应中的Serval picobarns围绕的合成部分。 $^{295} $ 120元素的生产横截面已在反应中的1 picobarn评估$^{46} $ ti（$^{251} $ cf，2n）$^{295} $ 120 $ 120 $ 120 $ e^*$ = 26 mev。为即将进行的实验提出了最佳的弹丸 - 靶标组合和光束能量，用于产生原子数Z = 119-120的新SHE。
We have calculated production cross sections of new superheavy elements with atomic number Z=119,120 in the fusion-evaporation reactions of $^{48}$Ca+$^{252}$Es, $^{48}$Ca+$^{257}$Fm, $^{49}$Sc+$^{252}$Es, $^{49}$Sc+$^{251}$Cf, $^{50}$Ti+$^{247}$Bk, $^{50}$Ti+$^{251}$Cf, $^{51}$V+$^{247}$Cm, $^{51}$V+$^{247}$Cf, $^{54}$Cr+$^{243}$Am, $^{54}$Cr+$^{247}$Cm, $^{56}$Mn+$^{244}$Pu, $^{56}$Mn+$^{243}$Am, $^{60}$Fe+$^{237}$Np, $^{60}$Fe+$^{244}$Pu, $^{61}$Co+$^{238}$U, $^{61}$Co+$^{237}$Np, $^{64}$Ni+$^{231}$Pa, $^{64}$Ni+$^{238}$U, $^{65}$Cu+$^{232}$Th, $^{65}$Cu+$^{231}$Pa, and $^{68}$Zn+$^{232}$Th within the dinuclear system model systematically. The inner fusion barriers have been extracted from the driving potential or potential energy surface which could be used to predict the relative fusion probability roughly. The influence of mass asymmetry of the colliding partners on the production of new superheavy elements (SHE) has been investigated systematically. It is found that fusion probability increase along with the increasing mass asymmetry of colliding systems. The Ti-induced reactions have the largest cross-sections of the new SHE. The dependence of production cross-sections of new superheavy elements on the isospin of projectile nuclei has been discussed. The new SHE of $^{289-295}$119 has been predicted as the synthesis cross sections around serval picobarns in the $^{46,48,50,52}$Ti-induced reactions. Production cross-section of the element of $^{295}$120 has been evaluated as large as 1 picobarn in the reactions $^{46}$Ti ($^{251}$Cf, 2n) $^{295}$120 at $E^*$ = 26 MeV. The optimal projectile-target combinations and beam energies for producing new SHE with atomic number Z=119-120 are proposed for the forthcoming experiments.
