Impact factor of Chinese Physics C is 3.6 in 2023 Impact factor of Chinese Physics C is 3.6 in 2022 2021 Impact Factor 2.944
Advanced Search
Chinese Physics C> 1985, Vol. 9> Issue(4) : 454-460 

THE SHELL EFFECT IN SEQUENTIAL FISSION INDUCED BY 238U WITH ENERGY JUST ABOVE COULOMB BARRIER

  • The experimental results of sequential fission are presented for collision of 238U (5.4MeV/u) on 48Ca,45S and 238U(6.0MeV/u) on 16O,48Ca,45Sc,48Ti,58Fe,64Ni and 89Y targets. The measurements of ternary events in exit channel have been performed by triple coincidence among 4 PPAC with area of 20 cm×30 cm. The reconstrction of ternary events are performed by direct kinematics and the fission partner among three fragments is identified by relative velocities between them. The detection geomentry efficiency is determind by a Monte-Carlo simulation.
    Before the sequential fission, U-like fragments are scattered near grazing angle. The most probable value of TKEL in the scattering process associated with S.F.changes from 25 MeV to 55 MeV for different reaction systems. The angular distributions of debris of S.F. in second C.M. are isotropic.
    In conclusion, because of lower fission threshold at Uranium region, the sequential fission mainly follows quasielastic scattering, in S.F. cross-section σS.F there is strong shell effect. A simple relationship between σS.F over σR, the total reaction cross-section and Sommerfeld parameters S for nuclei with magic number are obtained.
  • 加载中

  • References

    [1] W. Brüchle et al., GSI Scientific Report, 1980, P. 4.[2] H. Backe et. al., GSI Scientific Report, 1930 , P. 3.[3] D. V. Havach et. al., Pyhs. Rev. Lett.. 42(1979) 1728.[4] A. Gobbi et. aI., private communication.[5] G. Dai et. al., GSI Scientific Report, 1982, P. 225.[6] V. E. Viola, Jr., Nucl. Data, A1(196d), 39.

  • Access

    加载中

Get Citation
DAI Guang-Xi, THE SHELL EFFECT IN SEQUENTIAL FISSION INDUCED BY 238U WITH ENERGY JUST ABOVE COULOMB BARRIER[J]. Chinese Physics C, 1985, 9(4): 454-460.
DAI Guang-Xi, THE SHELL EFFECT IN SEQUENTIAL FISSION INDUCED BY 238U WITH ENERGY JUST ABOVE COULOMB BARRIER[J]. Chinese Physics C, 1985, 9(4): 454-460. shu
Milestone
Received: 1900-01-01
Revised: 1900-01-01
Article Metric

Article Views(2843)
PDF Downloads(444)
Cited by(0)
Policy on re-use
To reuse of subscription content published by CPC, the users need to request permission from CPC, unless the content was published under an Open Access license which automatically permits that type of reuse.
通讯作者: 陈斌, bchen63@163.com
  • 1. 

    沈阳化工大学材料科学与工程学院 沈阳 110142

  1. 本站搜索
  2. 百度学术搜索
  3. 万方数据库搜索
  4. CNKI搜索

Email This Article

Title:
Email:

THE SHELL EFFECT IN SEQUENTIAL FISSION INDUCED BY 238U WITH ENERGY JUST ABOVE COULOMB BARRIER

  • DAI Guang-Xi ,
    • , 
    • , 
    • , 
    • , 
    • , 
    • , 
    • , 
    • , 
    • , 
    • , 
    • , 
    • , 
    Corresponding author: DAI Guang-Xi,
  • Received Date: 1900-01-01
  • Accepted Date: 1900-01-01
  • Available Online: 1985-08-05

Abstract: The experimental results of sequential fission are presented for collision of 238U (5.4MeV/u) on 48Ca,45S and 238U(6.0MeV/u) on 16O,48Ca,45Sc,48Ti,58Fe,64Ni and 89Y targets. The measurements of ternary events in exit channel have been performed by triple coincidence among 4 PPAC with area of 20 cm×30 cm. The reconstrction of ternary events are performed by direct kinematics and the fission partner among three fragments is identified by relative velocities between them. The detection geomentry efficiency is determind by a Monte-Carlo simulation.
Before the sequential fission, U-like fragments are scattered near grazing angle. The most probable value of TKEL in the scattering process associated with S.F.changes from 25 MeV to 55 MeV for different reaction systems. The angular distributions of debris of S.F. in second C.M. are isotropic.
In conclusion, because of lower fission threshold at Uranium region, the sequential fission mainly follows quasielastic scattering, in S.F. cross-section σS.F there is strong shell effect. A simple relationship between σS.F over σR, the total reaction cross-section and Sommerfeld parameters S for nuclei with magic number are obtained.

    HTML

Reference (1)

目录

Link
IOPScience
SCOAP3
arXiv
Chinese Physical Society
Journal information
Introduction
Editorial Board
Others
Subscribe
Contact us
QQ: 1307685413
Tel: +86-010-88235947
Fax: +86-010-88233126
E-mail: cpc@ihep.ac.cn

  • CPC Website

  • IOP Website

  • CPC WeChat

Copyright © Institute of High Energy Physics, Chinese Academy of Sciences, 19B Yuquan Road, Beijing 100049, China 京ICP备05002789号-1

Supported by: Beijing Renhe Information Technology Co. Ltd  E-mail: info@rhhz.net

/

DownLoad:  Full-Size Img  PowerPoint
Return
Return