合成Z=119,120超重核的理论研究  

Theoretical Study on Synthesis of Z=119,120 Superheavy Nuclei

作　　者：王艺澎 张鸿飞[1,2] 马娜娜 李君清 WANG Yipeng;ZHANG Hongfei;MA Nana;LI Junqing(School of Nuclear Science and Technology,Lanzhou University,Lanzhou 730000,China;School of Physics,Xi'an Jiaotong University,Xi'an 710049,China;Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China)

机构地区：[1]兰州大学核科学与技术学院,兰州730000 [2]西安交通大学物理学院,西安710049 [3]中国科学院近代物理研究所,兰州730000

出　　处：《原子核物理评论》2022年第4期434-445,共12页Nuclear Physics Review

基　　金：2021年国家级大学生创新创业训练计划创新项目(202110730136);国家自然科学基金资助项目(12175170)。

摘　　要：合成Z=119,120超重核是当今各核物理实验室争相追逐的目标,理论预言可靠的弹靶组合、入射能等信息有助于超重核合成的实验设计和探测。本工作基于双核模型研究影响重离子核反应生成截面大小的反应机制,计算了^(50)Ti+^(249)Bk、^(50)Ti+^(249)Cf两个弹靶组合,预测^(50)Ti+^(249)Bk的生成截面为0.0211pb。考虑双核系统熔合与存活两个过程,重点关注^(52-59)Cr+^(243)Am、^(54-62)Mn+^(243)Am、^(56-72)Ni+^(238)U生成截面的同位素链依赖性,研究表明熔合几率随弹核质量数呈现强烈的依赖行为,直接影响蒸发剩余截面大小。Synthesis Z=119,120 superheavy nuclei is the goal that nuclear physics laboratories are chasing.Theoretically,it is helpful to design experiments and detect newly synthesized superheavy nuclei by giving reliable information such as projectile-target combination,incident energy,etc.Based on dinuclear system model,we explore the reaction mechanism affecting the generation cross section of the heavy ion nuclear reaction and calculate^(50)Ti+^(249)Bk、^(50)Ti+^(249)Cf projectile-target combination.Among them,we predicted that^(50)Ti+^(249)Bk generation cross section is 0.0211 pb.Considering the fusion process and surviv-al process,we focus on the isotopic dependence of the projectile isotopes,such as^(52-59)Cr+^(243)Am、^(54-62)Mn+^(243)Am、^(56-72)Ni+^(238)U.It is shown that the fusion probability is significantly dependent on the projectile nuclear mass number,which directly affects evaporation residual cross section.

关 键 词：超重核 双核模型 同位素链依赖性 内部熔合位垒 裂变位垒 

分 类 号：O571.321[理学—粒子物理与原子核物理]