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

强飞秒激光γ射线放大自发发射的基础研究

• 批准号: 15340075
• 负责人: SAKABE Shuji
• 金额: $ 10.62万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15340075/
• 关键词: Intense laser; short pulse laser; laser Plasmas; NEET; laser produced radiations; γ線放出

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.

为了研究利用短脉冲强激光产生的等离子体辐射（电子、离子和x射线）激发原子核产生g射线的可行性，编制了数据库，并进行了初步实验。特别是，NEET（通过电子跃迁的核激发）可行的元素和它们的跃迁已经被编译并且作为一种产生高能离子的方式被证明了团簇气体的库仑爆炸。研究了原子核数据表中的所有原子核数据，为r NEET提供了可行的元素和跃迁，并提交给原子数据和核数据表（即将出版）#激光团簇气体相互作用（氢，氩）实验已经完成，并观察到高能离子产生。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，结果表明，电子碰撞电离使离子部分电离，激光场加速电子电离内层电子是可能的。如果将来有更高强度的激光，在强光场电离过程中，内壳层电子可以被电离，从而诱发NEET，而当等离子体体积足够大时，在NEET下，γ射线可以在等离子体中被放大。

项目成果

S.Sakabe: "Generation of high energy protons from hydrogen clusters Coulomb-exploded by intense femtosecond laser pulses"Physical Review A. 69(tbp)(近日発行). (2004)

S.Sakabe：“通过强飞秒激光脉冲从氢簇库仑爆炸中产生高能质子”物理评论 A.69（tbp）（即将出版）（2004 年）。

Energy distributions of ions emitted from argon clusters Coulomb-exploded by intense femtosecond laser pulses

• DOI: 10.1103/physreva.69.063201
• 发表时间: 2004-06
• 期刊: Physical Review A
• 影响因子: 2.9
• 作者: M. Hirokane;S. Shimizu;M. Hashida;S. Okada;S. Okihara;F. Sato;T. Iida;S. Sakabe

Elements and their transitions feasible for NEET

对于 NEET 来说可行的元素及其转换

• 发表时间: 2005
• 期刊: Atomic Data and Nuclear Data Tables (掲載可)(発行予定)
• 作者: S.Sakabe;et al.
• 通讯作者: et al.

S.Okihara: "Ion generation in a low-density plastic foam by interaction with intense femtosecond laser pulses"Physical Review E. 69(2). 026401, 1-026401, 4 (2004)

S.Okihara：“通过与强飞秒激光脉冲相互作用在低密度塑料泡沫中产生离子”物理评论 E. 69(2)。

阪部 周二: "超高強度極短パルスレーザーが作り出す放射線"O pluse E. 25(9). 1004-1012 (2003)

Shuji Sakabe：“超高强度超短脉冲激光器产生的辐射”O pluse E. 1004-1012 (2003)。