2014/06/17 by V. A. Rachkov, Rachkov, V. A., A. V. Karpov +7
Earth and Planetary Sciences · Engineering · Physics and Astronomy · #Cold Fusion and Nuclear Reactions #Nuclear Physics and Applications #Nuclear reactor physics and engineering #nucl-th
paper · pdf · doi:10.48550/arxiv.1406.4372
arxiv created 2014/06/17 · arxiv updated 2014/06/18
[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.