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Recent developments in heavy-ion fusion reactions around the Coulomb barrier

机译：库仑屏障周围的重离子融合反应的最新发展

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The nuclear fusion is a reaction to form a compound nucleus. It plays an important role in several circumstances in nuclear physics as well as in nuclear astrophysics, such as synthesis of superheavy elements and nucleosynthesis in stars. Here we discuss two recent theoretical developments in heavy-ion fusion reactions at energies around the Coulomb barrier. The first topic is a generalization of the Wong formula for fusion cross sections in a single-channel problem. By introducing an energy dependence to the barrier parameters, we show that the generalized formula leads to results practically indistinguishable from a full quantal calculation, even for light symmetric systems such as ~(12)C+~(12)C, for which fusion cross sections show an oscillatory behavior. We then discuss a semi-microscopic modeling of heavy-ion fusion reactions, which combine the coupled-channels approach to the state-of-the-art nuclear structure calculations for low-lying collective motions. We apply this method to subbarrier fusion reactions of ~(58)Ni+~(s8)Ni and ~(40)Ca+~(58)Ni systems, and discuss the role of anharmonicity of the low-lying vibrational motions.
机译：核融合是形成化合物核的反应。它在核物理学以及核天体物理学中的几个情况中起着重要作用，例如在恒星中合成过度元素和核酸合成。在这里，我们讨论了围绕库仑屏障周围的能量的重离子融合反应的两个理论发展。第一个主题是在单通道问题中融合横截面的Wong公式的泛化。通过引入对屏障参数的能量依赖性，我们表明广泛性公式导致实际上与完全量子计算实际上无法区分的结果，即使对于诸如〜（12）C +〜（12）C的光对称系统，即使是融合横截面显示振荡行为。然后，我们讨论了重离子融合反应的半显微镜建模，这将耦合通道的方法与最先进的核结构计算结合起来，以进行低位的集体运动。我们将该方法应用于〜（58）Ni +〜（S8）Ni和〜（40）Ca +〜（58）Ni系统的子载波融合反应，并讨论了低位振动运动的Anharmonicity的作用。

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