1 / 21

中子诱发锕系核裂变后现象的研究 （ I ）发射中子前裂变碎片质量分布

中子诱发锕系核裂变后现象的研究 （ I ）发射中子前裂变碎片质量分布. 报告人 : 孙小军 课题组：王宁、欧立、刘敏、余呈刚、 梁月花、潘成华 单 位： 广西师范大学. Outline. Introduction Pre-neutron-emission mass distributions 1) low-energy ( E th ~7 MeV): 2) Intermediate energy (7~200 MeV): Conclusion. ≈1000 fragments.

kynan
Download Presentation

中子诱发锕系核裂变后现象的研究 （ I ）发射中子前裂变碎片质量分布

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 中子诱发锕系核裂变后现象的研究（I）发射中子前裂变碎片质量分布中子诱发锕系核裂变后现象的研究（I）发射中子前裂变碎片质量分布 报告人: 孙小军 课题组：王宁、欧立、刘敏、余呈刚、 梁月花、潘成华 单 位： 广西师范大学 14届全国核结构大会•湖州

  2. Outline • Introduction • Pre-neutron-emission mass distributions 1) low-energy (Eth~7 MeV): 2) Intermediate energy (7~200 MeV): • Conclusion

  3. ≈1000 fragments Independent yield Cumulative yield Nuclear Physics A 772 (2006) 113–137 Pre-neutron-emission mass distributions

  4. Double-hump structure; • The energy dependence of the heights of the peak and valley.

  5. Part II simplified fission potential: Mass distribution of fission fragments:

  6. low-energy (Eth~7 MeV): A1、A2 A2 ≈140 A1 = ACN - A2 Based on the nucleus-nucleus potential with the Skyrme energy-density functional, the driving potential of the fissile system is studied considering the deformations of nuclei.

  7. low-energy: heights of the peak and valley, i.e., P(A1) and P(A0)

  8. SUN Xiao-Jun(孙小军)*, YU ChengGang(余呈刚), Wang Ning(王宁)*, Phys.Rev.C,85,014613(2012)

  9. Intermediate energy (En=7~200 MeV): • Evaporation neutrons before fission; • The energy dependence of the driving potential can not obtain considering the deformations of nuclei; • Information is extracted from the fission cross section;

  10. (n,2nf) (n,nf) (n,f) n+238U

  11. In preparation

  12. Part III: conclusion • 提出了简单的裂变势及其裂变碎片发射中子前的质量分布形式，参数较少，可通过微观方法或系统学方法确定； • 低能情况下，基于核-核驱动势计算出中子诱发锕系核裂变初始碎片质量分布轻重峰位置，给出质量分布的峰谷随能量的系统学依赖关系，计算结果与实验值较好符合。 • 中能情况下，考虑了裂变前蒸发中子数随能量的依赖关系，在一定程度上给出了质量分布与入射中子能量的依赖关系。

  13. Futher work: • 裂变碎片发射快中子后，初始产物的独立产额； • 裂变碎片的平均总动能； • 中子多重数； • …….

  14. Thank you to your attention ! Welcome to Guilin!

  15. 广西物理（GUANGXI PHYSICS） 合办：广西物理学会；广西师范大学 类别：学术期刊（季刊、中文、大16开） 国际标准刊号（ISSN）：1003-7551 国内统一刊号（CN）：45-1150/O4 收录：中国学术期刊（光盘版）入编期刊 主编：侯德彭 副主编:柳继锋, 钟德卫, 杨永栩, …… 编辑部主任:孙小军 地址：桂林市育才路15号《广西物理》编辑部 邮编：541004 电话：0773-5818767

  16. 广西物理（GUANGXI PHYSICS） 栏目：研究成果（≈60%） 专题论析（≈30%） 教学研究（≈10%） 目标：争取3-5年中文核心刊物 http://imqmd.com/gxwl gxwl@gxnu.edu.cn 不收版面费！ 面向全国物理同行约稿!

More Related