用半经验耦合道模型计算重核俘获截面  

Calculations of capture cross section with semi-empirical coupled channel model

作　　者：刘玲[1] 崔琳琳 LIU Ling;CUI Linlin(College of Physical Science and Technology, Shenyang Normal University, Shenyang 110034, China)

机构地区：[1]沈阳师范大学物理科学与技术学院,沈阳110034

出　　处：《沈阳师范大学学报（自然科学版）》2020年第1期60-65,共6页Journal of Shenyang Normal University:Natural Science Edition

基　　金：国家自然科学基金面上项目(11575060)。

摘　　要：物理超重元素合成是核研究的热点问题之一。为了能够有效的进行核反应实验合成超重核,准确计算出重核熔合反应的俘获截面是非常重要的。通过使用半经验耦合道模型和2步模型的方法计算重核的俘获截面,并对其结果进行比较。可以发现2种方法的计算结果均与实验值相吻合。由于2步模型计算重核反应俘获截面需要根据已知实验值调节参数,目前只能计算48Ca与50Ti为入射粒子的核反应,不能计算更重的粒子作为入射粒子的核反应。而半经验耦合道模型方法则没有入射粒子的限制,具有普适性,可以计算任何弹靶组合的核反应俘获截面,并将其计算结果应用于2步模型的后续计算中。可用半经验耦合道模型方法对以52Cr和58Fe为入射粒子的核反应的俘获截面进行计算。The synthesis of superheavy nuclei is a hot study topic field in nuclear physics.In order to synthesize superheavy nuclei in experiment,it is very important to calculate accurately the capture cross section of fusion process.The capture cross sections of heavy nuclei are calculated and compared both with semi-empirical coupled channel model and two-step model.It can be found that the calculated results with the two methods are all in good agreement with the experimental data.Within two-step model,some parameters have to be adjusted according to the known experimental data for calculating the capture cross section of superheavy nuclei.At present,only the reactions for synthesis superheavy nuclei with projectile 48Ca or 50Ti could be calculated by using the two-step model.The nuclear reaction of heavier particles as incident particles can not be calculated.However,the semi-empirical coupled channel model is universal without the restriction of incident particles.The capture cross section of any combinations of projectile and target can be calculated.The results are applied to the subsequent calculations of the two-step model.The semi-empirical coupled channel model method can be used to calculate the capture cross sections of nuclear reaction with incident particles.

关 键 词：半经验耦合道模型 超重核 俘获截面 2步模型 核反应 

分 类 号：O571.423[理学—粒子物理与原子核物理]