我们报告了能量范围为4-155 A. MeV的各种系统的聚变-蒸发和/或聚变-裂变截面的综合系统学。以反应截面为标度,虽然当数据按质量不对称性排序时存在高度的相关性,但熔合截面并不表现出对所有体系都适用的普适行为,对于较轻且接近质量对称的体系,完全和不完全熔合激发函数的主要特征可以精确确定.尽管在15A.MeV以上的所有重系统中明显缺乏数据,但现有的数据表明,几何效应可以解释在入射能量高达155A.MeV时不完全聚变的持续性。
英文摘要:
We report on a comprehensive systematics of fusion-evaporation and/or fusion-fission cross sections for a very large variety of systems over an energy range 4-155 A.MeV. Scaled by the reaction cross sections, fusion cross sections do not show a universal behavior valid for all systems although a high degree of correlation is present when data are ordered by the system mass asymmetry.For the rather light and close to mass-symmetric systems the main characteristics of the complete and incomplete fusion excitation functions can be precisely determined. Despite an evident lack of data above 15A.MeV for all heavy systems the available data suggests that geometrical effects could explain the persistence of incomplete fusion at incident energies as high as 155A.MeV.
Anharmonicity of multi-octupole-phonon excitations in $^{208}$Pb: analysis with multi-reference covariant density functional theory and subbarrier fusion of $^{16}$O+$^{208}$Pb
Sub-barrier fusion of 32S+90,96Zr: semi-classical coupled-channels approach
在库仑位垒附近和下方,测量了~(32)S +~(90)Zr和~(32)S +~(96)Zr的熔合激发函数,并获得了较好的精度。与32 S +90 Zr相比,32 S +96 Zr的亚势垒截面大得多。半经典耦合通道计算包括双声子激发能够描述子势垒增强仅为32 S +90 Zr。对32 S +96 Zr的分歧来自于该系统的正Q值中间中子转移。与~(40)Ca +~(96)Zr的比较表明,与正Q值中子转移通道的耦合可能在势垒下聚变增强中起作用。为了克服32 S +96 Zr的不一致性,提出了一个考虑中子迁移的简单模型计算。
Neutron dynamics in the fusion of neutron-rich O ions with $^{12}$C
Indiana University(印第安纳大学);GANIL, CEA/DRF-CNRS/IN2P3;Facility for Rare Isotope Beams and Department of Chemistry, Michigan State University(稀有同位素束流设施及密歇根州立大学化学系)
Theoretical study of fusion reactions $^{32}$S + $^{94,96}$Zr and $^{40}$Ca + $^{94,96}$Zr and quadrupole deformation of $^{94}$Zr
用普适熔合函数形式和经验耦合通道(ECC)模型研究了$^{32}$ S + $^{94,96}$ Zr和$^{40}$ Ca + $^{94,96}$ Zr反应熔合截面的动力学耦合效应.对约化聚变函数的检验表明,非弹性激发和中子转移通道的耦合对$^{32}$ S + $^{94}$ Zr($^{40}$ Ca + $^{94}$ Zr)中聚变的总影响与$^{32}$ S + $^{96}$ Zr($^{40}$ Ca + $^{96}$ Zr)中的影响几乎相同。利用ECC模型分别计算了非弹性通道耦合和中子转移通道耦合对亚势垒区熔合截面的影响。结果表明,在以$^{94}$ Zr为靶的反应中,耦合对非弹性激发通道的影响应与以$^{96}$ Zr为靶的反应相似。这意味着$^{94}$ Zr和$^{96}$ Zr的四极形变参数$β_2$应该彼此相似。然而,在ECC模型中使用的从有限范围液滴模型预测的$β_2$是相当不同的。提出了$^{48}$ Ca + $^{94}$ Zr或$^{36}$ S + $^{94}$ Zr的实验,以解决关于$^{94}$ Zr的$β_2$的困惑问题。