Fundamental study on uranium enrichment by nuclear excitation in laser plasma
激光等离子体核激发浓缩铀的基础研究
基本信息
- 批准号:59880002
- 负责人:
- 金额:$ 3.58万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Developmental Scientific Research
- 财政年份:1984
- 资助国家:日本
- 起止时间:1984 至 1985
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Nuclear excitation of <^(235)U> in a laser produced uranium plasma has been investigated experimentally and theoretically. This scheme may be applicable to uranium enrichment.A metallic natural uranium target was irradiated by a focused <CO_2> laser beam. The 26 min isomers of <^(235)U> were produced by NEET (Nuclear Excitation by Electron Transition), which were confirmed by detecting the internal conversion electrons from the isomeric level of <^(235)U> nucleus.The probability of the nuclear excitation of <^(235)U> in the laser produced plasma was estimated from the number of the excited nuclei. The value experimentally obtained was fairly in good agreement with the theoretically expected value.The temperature dependence of the excitation rate to the isomeric level in the plasma was measured by varying the focusing condition of the laser beam to the uranium target, and was compared with the theoretically predicted dependence. When the electron temperature is lower than 50eV, the production of the isomer was not observed. The electron temperature of 400-500eV is favorable for the nuclear excitation of <^(235)U> in the plasma.The efficiency of nuclear excitation increased linearly with the electron density of the plasma, which was confirmed from the comparison of the excitation rates by 1 <micro> m (Nd:YAG laser) and 10 <micro> m ( <CO_2> laser) irradiations. This shows the availability of the pellet implosion to improve the production rate of <^(235)U> isomers.
对铀激光等离子体中~(235)U的核激发进行了实验和理论研究。利用聚焦激光束辐照天然铀靶,研究了激光辐照铀靶<CO_2>的靶向效应。利用NEET(Nuclear Excitation by Electron Transition)技术,通过对<^(235)U>核同质异能态能级内转换电子的探测,证实了<^(235)U>的26 min同质异能态,并根据激发核数估算了激光等离子体中<^(235)U>核激发的几率。通过改变激光束对铀靶的聚焦条件,测量了等离子体中激发率与同质异能态能级的温度关系,并与理论预测值进行了比较。当电子温度低于50 eV时,没有观察到异构体的产生。400- 500 eV的电子温度有利于等离子体中<^(235)U>的核激发,核激发效率随等离子体中电子密度的增加而线性增加,这一点在1 <micro>m(Nd:YAG激光)和10 <micro>m(<CO_2>Nd:YAG激光)辐照下的激发率比较中得到了证实。这表明了弹丸内爆对提高<^(235)U>异构体生产率的有效性。
项目成果
期刊论文数量(20)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Report of LIS Meeting Division, IEE of Japan. 5-1. (1985)
日本 IEE LIS 会议部门的报告。
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- 影响因子:0
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Digest of Techinical Papers, 6th Ann. Meet. Laser Soc. Japan. (1986)
技术论文文摘,第 6 版。
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- 影响因子:0
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YAMANAKA Chiyoe其他文献
YAMANAKA Chiyoe的其他文献
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{{ truncateString('YAMANAKA Chiyoe', 18)}}的其他基金
Research on laser triggered lightning for practical use
激光触发闪电实用化研究
- 批准号:
10355012 - 财政年份:1998
- 资助金额:
$ 3.58万 - 项目类别:
Grant-in-Aid for Scientific Research (A)
Apparatus of Uranium Atomic bbam by Laser Heating for Laser Isotope Separation
激光加热铀原子bbam激光同位素分离装置
- 批准号:
63880004 - 财政年份:1988
- 资助金额:
$ 3.58万 - 项目类别:
Grant-in-Aid for Developmental Scientific Research (B).
Isotope Separation by Lasers
激光同位素分离
- 批准号:
63302030 - 财政年份:1988
- 资助金额:
$ 3.58万 - 项目类别:
Grant-in-Aid for Co-operative Research (A)
Synthetic Research on Laser Electro-Optics and Quantum Electronics System
激光电光与量子电子系统综合研究
- 批准号:
61302047 - 财政年份:1986
- 资助金额:
$ 3.58万 - 项目类别:
Grant-in-Aid for Co-operative Research (A)
相似海外基金
Emission Wavelength Magnetically Tunable Infrared Laser for Uranium Enrichment
用于铀浓缩的发射波长磁可调谐红外激光器
- 批准号:
60420030 - 财政年份:1985
- 资助金额:
$ 3.58万 - 项目类别:
Grant-in-Aid for General Scientific Research (A)