arXiv 1707.075832017-07-24nucl-ex

亚势垒和近势垒重离子聚变反应的最新实验结果

Recent experimental results in sub- and near-barrier heavy ion fusion reactions

Giovanna Montagnoli, Alberto M. Stefanini

备注：: 40 pages, 63 figures, review paper accepted for EPJA
DOI：: 10.1140/epja/i2017-12350-2

摘要：

本文综述了近势垒重离子聚变反应和亚势垒重离子聚变反应的最新研究进展。重点是在过去的十年中所取得的成果，重点将主要放在实验工作进行有关的影响，转移通道上的融合截面和障碍现象远低于障碍。事实上，亚势垒聚变的早期数据告诉我们，截面可能强烈地依赖于碰撞核的低能集体模式，并且可能依赖于与转移通道的耦合。耦合通道（CC）模型已经相当成功地解释了实验证据。熔合势垒分布通常产生相关耦合通道的指纹。本文报道了最近用放射性核束获得的结果。在深亚势垒能量下，半对数图中激发函数的斜率在许多情况下保持增加，并且标准CC计算过度预测截面。这被称为一种阻碍现象，其物理起源仍然是一个争论的问题。最近的理论发展表明，这种效应，至少部分地，可能是泡利不相容原理的结果。这种阻碍可能在天体物理学中产生深远的影响，其中光系统的融合决定了碳和氧燃烧阶段的恒星演化，并为发生在吸积中子星内壳的奇异反应提供了重要信息。

英文摘要：

Recent advances obtained in the field of near and sub-barrier heavy-ion fusion reactions are reviewed. Emphasis is given to the results obtained in the last decade, and focus will be mainly on the experimental work performed concerning the influence of transfer channels on fusion cross sections and the hindrance phenomenon far below the barrier. Indeed, early data of sub-barrier fusion taught us that cross sections may strongly depend on the low-energy collective modes of the colliding nuclei, and, possibly, on couplings to transfer channels. The coupled-channels (CC) model has been quite successful in the interpretation of the experimental evidences. Fusion barrier distributions often yield the fingerprint of the relevant coupled channels. Recent results obtained by using radioactive beams are reported. At deep sub-barrier energies, the slope of the excitation function in a semi-logarithmic plot keeps increasing in many cases and standard CC calculations over-predict the cross sections. This was named a hindrance phenomenon, and its physical origin is still a matter of debate. Recent theoretical developments suggest that this effect, at least partially, may be a consequence of the Pauli exclusion principle. The hindrance may have far-reaching consequences in astrophysics where fusion of light systems determines stellar evolution during the carbon and oxygen burning stages, and yields important information for exotic reactions that take place in the inner crust of accreting neutron stars.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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