Nuclear Reactions in High Density Plasmas and Low Energy Nuclear Physics

由于核反应截面在极低能区很小，所以在实验和理论上都没有得到研究。最近，在低温激光内爆等离子体和典型温度为100 eV-1keV的D_2O弹丸碰撞中观察到了氚的聚变反应。为了分析实验结果，我们研究了强耦合高密度等离子体中高密度对核聚变反应的影响。实际上，我们已经从理论上研究了在高密度双组分等离子体中提高聚变反应速率的问题。用带电子屏蔽的超网链(HNC)方程描述了高密度双组分等离子体中的离子-离子关联。为了考虑束缚电子的屏蔽作用，利用Thomas-Fermi模型，用HNC方程同时计算了材料的电离度。结果表明，由于高Z离子将D离子挤压成小体积，增加了D离子的碰撞率，D-D相互作用的熔合反应速率提高了2~4倍。

Since the nuclear reaction cross sections are very small in extremely low energy regime, they have not been investigated both in experiment and theory. Recently, fusion reactions of deuterium were observed in low temperature laser implosion plasmas and colliding D_2O pellets of which temperature is typically 100eV-1keV. In order to analyze the experimental results, we investigated the high density effects on the nuclear fusion reactions in strongly coupled high density plasmas. Actually, enhancement of fusion reaction rate in high density two component plasmas which consist of deuterium (D) and high Z material such as carbon (C) or titanium (Ti) has been investigated theoretically. Ion-ion correlation in high density two component plasmas is described by hyper-netted chain (HNC) equation with electron shielding. To take into account the shielding by bound electrons, the degree of ionization of the materials is calculated simultaneously with HNC equation by using Thomas-Fermi model. The results show that the fusion reaction rate of D-D interaction is enhanced by a factor from 2 to 4 because high Z ions squeeze D ions into a small volume to increase collision rate of D ions.