用能量相关核势对^(40)Ca+^(90,96)Zr反应的多声子耦合道效应的研究  

Study of multiphonon coupled channel effect of ^(40)Ca+^(90,96)Zr reactions using an energy-dependent nuclear potential

作　　者：毛英臣[1] 李京珂 范美辰 马瑛晗 MAO Yingchen;LI Jingke;FAN Meichen;MA Yinghan(School of Physics and Electronic Technology, Liaoning Normal University, Dalian 116029, China)

机构地区：[1]辽宁师范大学物理与电子技术学院,辽宁大连116029

出　　处：《辽宁师范大学学报（自然科学版）》2021年第4期469-477,共9页Journal of Liaoning Normal University:Natural Science Edition

基　　金：国家自然科学基金项目(11447019);辽宁省教育厅科学研究项目(LF2020002)。

摘　　要：为了研究核势对重离子熔合反应动力学的影响,多声子耦合道效应必须被深入研究.通过对^(40)Ca+^(90,96)Zr反应的模拟,比较了能量相关的Woods-Saxon势(EDWSP)与其静态核势(SWSP)的差异.计算结果表明,对^(40)Ca+^(90)Zr反应,考虑靶核的双声子耦合效应,两种势模型都可以较好地重现实验熔合激发函数,但通过与实验势垒分布的对比分析未发现EDWSP模型要优于SWSP模型.而对^(40)Ca+^(96)Zr反应,由于存在着中子转移,即使考虑靶核3声子2^(+)态转动激发和3^(-)态的振动激发,SWSP模型仍然不能重现实验熔合激发函数,而EDWSP模型尽管较好地重现了近垒能区的实验结果,但仍然未能再现极深垒下能区的实验规律,两种模型也都未重现实验势垒分布.上述结果意味着对实验结果的理想重现需要考虑多中子转移,^(40)Ca的多声子2^(+)态转动激发以及其与靶核^(90,96)Zr的相互耦合等其他耦合道效应.In order to study the influence of nuclear potential on heavy-ion fusion dynamics,the multi-phonon coupling channel effect need to be studied thoroughly.The differences between the energy dependent Woods-Saxon potential and its static counterpart are investigated though numerical simulations of ^(40)Ca+^(90,96)Zr reactions.The results show the two models can well reproduce the experimental fusion excitation function for ^(40)Ca+^(90)Zr reaction when two phonons coupling effect of ^(90)Zr are taken into account.There is not sign to support that the EDWSP model is better than the SWSP model though the comparison about the experimental barrier distribution calculated by two models.For ^(40)Ca+^(96)Zr reaction,due to the existence of neutron transfer,the SWSP model cannot reproduce the experimental fusion excitation functions even considering the rotational excitation of 96Zr three-phonons 2^(+) state and the vibrational excitation of three-phonons 3^(-) state,while the EDWSP model can well reproduce the experimental results in the near sub-barrier energy region,but still also cannot reproduce the experimental results in the extra sub-barrier energy region.Furthermore,there is neither of the two models can reproduce the experimental barrier distribution.The aforementioned results suggest that the better reproduction of the experimental results needs to take account other coupling channel effects,such as multi-neutron transfer,multi-phonon 2^(+) state rotational excitation of ^(40)Caand its mutual coupling with ^(90,96)Zr.

关 键 词：能量相关的Woods-Saxon势 耦合道效应 熔合反应截面 势垒分布 

分 类 号：O571.6[理学—粒子物理与原子核物理]