关键词: 
超重核 /
熔合蒸发反应 /
驱动势 /
主方程

摘要: 研究了采用类弹碎片质量数为变量的一维(1D)主方程(ME)描述重离子熔合反应时的受限制条件， 建立了以类弹碎片中子和质子数为独立变量的二维(2D) ME， 并采用分步差分格式法数值解(2D) ME得到了熔合几率。 新的方法适用于研究任何弹靶组合系统， 给出了与实验符合更好的结果， 为寻求合成超重核的反应道提供了更为宽阔的选择空间。 同时也研究了弹靶的不同同位旋组合对复合核形成截面的影响。 The limitation of the one dimensional master equation with the mass number of projectlike fragment as the variable is discussed. A twodimensional master equation with neutron and proton numbers of the projectlike fragment as variables is set up， and solved numerically by means of a two step difference scheme to obtain fusion probability. The new equation is suitable for studying fusion reactions with any projectiletarget combination， and can better fit the experimental data， so that it can provide a large probability to choose the reaction system for synthesizing a certain superheavy nucleus. The influence of projectiletarget combinations with different isospins on the crosssections of compound nuclei is studied.