重离子反应中质子与中子转移对超重元素合成的影响

黄明辉; 甘再国; 周小红; 李君清; #

doi:10.11804/NuclPhysRev.25.04.327

重离子反应中质子与中子转移对超重元素合成的影响

Effect of Proton and Neutron Transfer on Synthesizing Superheavy Elements in Heavy Ion Reactions

摘要

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.

Abstract: 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.

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