Study on NEET (nuclear excitaion by electron transition) with ulrta-short high-intensity pulse lasers

用超短高强度脉冲激光成功地观察了铀中的NEET现象。研制了台式钨钛蓝宝石激光系统。利用核径迹探测器研究了短脉冲TW激光器等离子体发射的高能离子（bbb10 1MeV）。观察到高于10Mev的高能离子，>MeV离子的会聚效率为10e-10。TW激光脉冲辐照铀产生高能离子和x射线，使铀原子的内层电子电离。实际上，经过TW激光照射的铀发出的电子衰变时间约为30min，与铀内部交换产生的电子相对应。

The NEET phenomena in uranium with a ultra-short high-intensity pulse laser has been succesfully observed. Table-top TW Ti : sapphire laser system has been developed. The energetic ions (>1MeV) emitted from the plasmas produced by the short pulse TW laser was studied by using nuclear-track detecotrs. Energetic ions of higher than 10Mev were observed and the converging efficiency of the >MeV ions are 10e-10. The irradiarice of TW laser pulse on uranium yield the energetic ions and x-ray, which would be ionize innershell electons of the atom. Actually the uranium iraddiated by the TW laser emit electorn with the decay of about 30minutes, whicj is corresponding to the electron produced by the internal exchange in uranium.