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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Neutron transfer versus inelastic surface vibrations in the enhancement of sub-barrier fusion excitation function data and the energy dependent Woods-Saxon potential
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Neutron transfer versus inelastic surface vibrations in the enhancement of sub-barrier fusion excitation function data and the energy dependent Woods-Saxon potential

机译:中子传递与非弹性表面振动在子势垒聚变激发函数数据和依赖于能量的Woods-Saxon势的增强中的作用

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摘要

This work deeply analyzed the relative importance of the neutron transfer channels and inelastic surface vibrations of colliding nuclei in the sub-barrier fusion enhancement of various heavy ion systems using an energy dependent Woods-Saxon potential (EDWSP) model in conjunction with a one-dimensional Wong formula and the coupled channel formulation using the code CCFULL. The multi-phonon vibrational states of colliding nuclei and the nucleon transfer channels are found to be dominant internal degrees of freedom. The coupling between the relative motion of reactants and these relevant channels produces anomalously large sub-barrier fusion enhancement over the expectations of the one-dimensional barrier penetration model. In some cases, the influence of neutron transfer dominates over the couplings to low lying surface vibrational states of collision partners. Furthermore, the effects of coupling to inelastic surface excitations and the impact of neutron transfer channels with positive ground state Q-values are imitated due to energy dependence in the Woods-Saxon potential. In the EDWSP model calculations, a wide range for the diffuseness parameter, which is much larger than the value extracted from the elastic scattering data, is needed to account for the observed fusion enhancement in the close vicinity of the Coulomb barrier.
机译:这项工作使用能量依赖性Woods-Saxon势(EDWSP)模型结合一维模型,深入分析了中子传输通道和碰撞核的非弹性表面振动在各种重离子系统的亚势垒聚变增强中的相对重要性。旺公式和耦合通道公式使用代码CCFULL。发现碰撞核和核子传递通道的多声子振动状态是主要的内部自由度。反应物的相对运动与这些相关通道之间的耦合会在一维屏障穿透模型的期望范围内产生异常大的子屏障融合增强。在某些情况下,中子传递的影响在整个耦合器上占主导地位,而碰撞伙伴的低地表振动状态也是如此。此外,由于Woods-Saxon势能中的能量依赖性,可以模拟耦合到非弹性表面激励的影响以及具有正基态Q值的中子传输通道的影响。在EDWSP模型计算中,需要一个很大的扩散参数范围,该范围要比从弹性散射数据提取的值大得多,以解决在库仑势垒附近观察到的融合增强问题。

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