fundamental research on amplified spontaneous emission of γ-ray with an intense femtosecond laser

为了研究强脉冲激光产生的等离子体辐射(电子、离子和X射线)激发的原子核产生g射线的可能性，编制了数据库，并进行了初步实验。特别是，对NEET(电子跃迁核激发)可行的元素及其跃迁进行了汇编，并论证了作为产生高能离子的一种方法--团簇气体的库仑爆炸。#调查了核数据表中所有核数据中可用于r NEET的元素和跃迁，并提交给原子数据和核数据表(待出版)#已经进行了激光-团簇气体相互作用(氢、Ar)实验，并观察到高能离子的产生。#对于库仑爆炸产生的离子，研究了离子能量与激光强度的关系，能量表明离子被电子碰撞电离部分电离，如果将来有更高强度的激光，在强光场的电离过程中，内壳层电子可以被电离成NEET，当等离子体体积大到足以激发发射时，γ射线可以在NEET下的等离子体中被放大。

To investigate the future feasibility of the generation of g-ray from nucleus excited by radiations(electrons, ions, and x-ray) emitted from the plasmas produced with an intense short pulse laser, the data-base has been compiled and preliminary experiment has been done. Especially, the elements and their transitions feasible for NEET (nuclear excitation by electron transition has been compiled and as one way to generate energetic ions Coulomb-Explosion of cluster gas was demonstrated.# Investigated all nucleus data from Nuclear Data Sheets for the elements and transitions feasible for r NEET, and submitted to the Atomic Data and Nuclear Data Tables (to be published)# Laser-cluster gas interaction (hydrogen, argon) experiment has been done, and energetic ion generation was observed.# For the ions generated by Coulomb explosion, ion energy dependence on laser intensity was studied, and the energy suggested that the ions are partially ionized by electron impact ionization, and it may be possible to ionized inner shell electrons by electron accelerated by laser field.# If in future higher intensity laser will be available, in the process of ionization in intense optical field inner shell electrons can be ionized inducing sequentially NEET, and with the plasma volume large enough for stimulate emission, γ-ray can be amplified in the plasma under NEET.