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近库仑位垒重离子俘获与熔合是一个典型的多位垒穿透过程。在本征道的理论框架下,多反应道的耦合会使得单个位垒分离成一系列的分立位垒。基于位垒分布的思想,我们最近发展了一个经验的耦合道(ECC)模型,并系统地研究了220个反应体系的俘获激发函数。最近,实验报道了熔合反应~(46,50)Ti+~(124)Sn俘获激发函数的测量结果。本文将简要介绍该ECC模型,并结合通用熔合函数(UFF)的约化方法,利用该模型研究熔合反应~(46,50)Ti+~(124)Sn中的耦合道效应。UFF的约化结果表明,相比于~(50)Ti+~(124)Sn,~(46)Ti+~(124)Sn的垒下俘获截面有额外的增强。ECC模型成功地再现了实验测得的俘获激发函数,并表明,~(46)Ti+~(124)Sn垒下俘获截面的额外增强来源于正Q值的中子转移效应。
Near Coulomb barrier heavy ion capture and fusion is a typical multi-barrier penetration process. Under the theoretical framework of this doctrine, the coupling of multiple reactors separates a single barrier into a series of discrete barriers. Based on the idea of barrier distribution, we recently developed an empirical coupled-path (ECC) model and systematically studied the capture excitation functions of 220 reaction systems. Recently, the experiment reported the results of the fusion reaction ~ (46,50) Ti + ~ (124) Sn trapping excitation function. This article will briefly introduce the ECC model, and use the generalized fusion function (UFF) reduction method to study the coupling effect in ~ (46,50) Ti + ~ (124) Sn. The results of the reduction of UFF show that there is an additional enhancement of the capture cross-section of ~ (46) Ti + ~ (124) Sn under the ~ (50) Ti + ~ (124) Sn. The ECC model successfully reproduces the experimentally measured trapping excitation function and shows that the extra enhancement of the trapping cross section under the ~ (46) Ti + ~ (124) Sn barrier results from the positive Q-value neutron transfer effect.