摘要
总结和回顾了超重核结构和反应研究的历史和现状,利用形变约束的相对论平均场理论系统计算了实验观测到的Z=102—112号元素的能量随形变的变化,得到了这些核素的基态和鞍点性质,利用Strutinsky壳修正方法研究了壳效应对这些核素的影响.利用所得到的结构信息,计算了相应的冷熔合反应的截面,给出了与实验相仿的结果,得到Z=118号元素的合成截面为23pb,比宏观模型的结果小20倍.讨论了相关物理量对反应截面的影响.同时,还给出了相对论连续谱Hartree Bogoliubov(RCHB)理论对滴线外核1800Sn的描述.
The studieson structure and reaction for superheavy elements are reviewed. Based on constrained relativistic mean field(CRMF) theory, binding energiesof elements from Z=102 to Z=112, which can be measured experimentally, as a function of deformation arecalculated, and the properties of equilibrium and saddle point of these nuclides are obtained. Using the single particle levels based on CRMF, the shell effects are obtained with Structinsky method. The cross sections of the cold fusion are estimated by applying the structure information. Theoretical result and experimental measure are in a good agreement, and the theoretical prediction of cross section of element Z=118 is one order small than the earlier prediction and more close to theexperimental upper limit. The influences of the physical quantityon the cross section are discussed. Finally, thedescription for nuclei beyond the dripline, e. g.,1800Sn, is given by Relativistic Continuum HartreeBogoliubov theory.
出处
《原子核物理评论》
CAS
CSCD
北大核心
2003年第2期137-147,共11页
Nuclear Physics Review
基金
国家重点基础研究发展规划资助项目(G2000077407)
国家自然科学基金资助项目(10025522
10047001
19935030)
