Damping of Quantum Vibrations Reviled in deep sub-barrier fusion reactions
Damping of Quantum Vibrations Reviled in deep sub-barrier fusion reactions
复制标题
深度亚势垒聚变反应中量子振动的阻尼受到诟病
DOI：
10.1103/physrevc.88.011602
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发表时间：
2013
影响因子：
3.1
通讯作者：
Takatoshi Ichikawa and Kenichi Matsuyanagi
中科院分区：
文献类型：
--
作者：
N. Iizuka;D. Kabat;Norihiro Iizuka;Norihiro Iizuka;Norihiro Iizuka;Norihiro Iizuka;Norihiro Iizuka;Norihiro Iizuka;Norihiro Iizuka;飯塚則裕;Takatoshi Ichikawa and Kenichi Matsuyanagi
我们证明，当两个碰撞的原子核相互接近时，它们的量子振动在接触点附近衰减。我们表明，这种阻尼是造成深亚势垒聚变反应中测量到的聚变阻碍现象的原因。为了证明这些，我们首次将随机相位近似方法应用于二体系统。我们计算绝热接近的两个原子核的八极跃迁强度。计算出的跃迁强度在接触点附近急剧下降，这强烈表明每个核的相对运动和振动固有自由度之间的量子耦合消失。基于该图，我们还使用耦合通道方法和模拟耦合消失的阻尼因子来计算系统的融合截面。计算结果很好地再现了实验数据，这表明深层亚势垒聚变反应确实发生了从突变到绝热过程的平滑过渡。
We demonstrate that when two colliding nuclei approach each other, their quantum vibrations are damped near the touching point. We show that this damping is responsible for the fusion hindrance phenomena measured in the deep sub-barrier fusion reactions. To show those, we, for the first time, apply the random-phase-approximation method to the two-bodyandsystems. We calculate the octupole transition strengths for the two nuclei that adiabatically approach each other. The calculated transition strength drastically decreases near the touching point, which strongly suggests the vanishing of the quantum couplings between the relative motion and the vibrational intrinsic degrees of freedom of each nucleus. Based on this picture, we also calculate the fusion cross section for thesystem by using the coupled-channel method with a damping factor that simulates the vanishing of the couplings. The calculated results reproduce the experimental data well, which indicates that the smooth transition from the sudden to the adiabatic processes indeed occurs in the deep sub-barrier fusion reactions.