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arXiv 1406.4372nucl-th
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具有正Q值的中子转移能增强势垒下聚变截面吗?

Does neutron transfer with positive Q-values enhance sub-barrier fusion cross section?

V. A. Rachkov, A. V. Karpov, A. S. Denikin, V. I. Zagrebaev

摘要:

[背景]对于许多碰撞核的组合,发现由于具有正的$Q$ -值的中子重排,亚势垒熔合截面显著增强。然而,最近报道的几个聚变反应的实验结果中,这种增强没有被观察到,尽管有可能的中子重排与积极的$Q$ -值。【目的】进一步阐明亚势垒聚变反应中中子重排的机制,寻找除正$Q$值外,有利于(或阻止)亚势垒聚变增强的其他条件。[方法]采用通道耦合方法和半经典中子输运模型对已有的实验数据进行分析。[结果](1)只有正$Q$ -值的1 n和2n转移对屏障下融合有显著影响。中子重排的正$Q$值是必要的,但不足以要求发生额外的亚势垒聚变增强。(2)碰撞核在集体激发方面的“刚性”是重要的,因为具有正$Q$值的中子重排引起的亚势垒聚变增强是清晰可见的。(3)“施主”核的中子结合能只有在轻弱结合核聚变的情况下才有较强的影响。

英文摘要:

[Background] Significant enhancement of sub-barrier fusion cross sections owing to neutron rearrangement with positive $Q$-values were found for many combinations of colliding nuclei. However several experimental results on fusion reactions were reported recently in which such enhancement has not been observed in spite of a possibility for neutron rearrangement with positive $Q$-values. [Purpose] We aim to clarify much better the mechanism of neutron rearrangement in sub-barrier fusion reactions to find the other requirements (beside positive $Q$-value) which favour (or prevent) sub-barrier fusion enhancement. [Method] Channel coupling approach along with the semi-classical model for neutron transfer have been used for analysis of available experimental data. [Results] (1) Only 1n and 2n transfers with positive $Q$-values have a noticeable impact on sub-barrier fusion. Positive $Q$-value for neutron rearrangement is necessary but not sufficient requirement for additional sub-barrier fusion enhancement takes place. (2) "Rigidity" of colliding nuclei in respect of collective excitations is important that the sub-barrier fusion enhancement due to neutron rearrangement with positive $Q$-value be clearly visible. (3) Neutron binding energy in "donor" nucleus has a strong impact only in the case of fusion of light weakly bound nuclei.

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