核内核子费米运动对π核双电荷交换反应的影响

Nuclear Fermi Motion Effect on Pion Double Charge Exchange

本文考察了核内核子费米运动对π核双电荷交换(DCX)反应传统机制的影响,计算了^(14)C核到同位旋相似态的双电荷交换(DIAs DCX)反应在0～300MeV能区的0°激发函数,在100～300MeV的能区内能够很好地符合实验值,而在50 MeV附近,则比实验值小2～3倍。结果表明:仅用传统机制似乎不能完全解释DIAS DCX的低能反常行为,需要引入新的机制。

The influence of nuclear Fermi motion on the conventional mechanism of pion double charge exchange (DCX) is examined. Concrete calculations of the 0°excitation function over the energy region 0--300 MeV are performed for the double isobaric analog DCX transition on ^(14)C. The calculated results coincide very well with the experimental data for the energies above 100 MeV, bu are about a factor of 2--3 smaller than the experimental data around 50 MeV. It indicates that the pure conventional mechanism seems incapable to fully explain the anomalous behavior of the low energy DCX, and some new mechanisms are needed.