中国物理B ›› 2009, Vol. 18 ›› Issue (4): 1413-1420.doi: 10.1088/1674-1056/18/4/022

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Analysis of prompt fission neutron spectrum and multiplicity for 237Np(n, f) in the frame of multi-modal Los Alamos model

郑娜, 丁毅, 钟春来, 陈金象, 樊铁栓   

  1. State Key Laboratory of Nuclear Physics and Nuclear Technology and School of Physics, Peking University, Beijing 100871, China
  • 收稿日期:2008-12-01 修回日期:2008-12-04 出版日期:2009-04-20 发布日期:2009-04-20
  • 基金资助:
    Project supported by the State Key Development Program for Basic Research of China (Grant Nos 2008CB717803 and 2007ID103) and the Research Fund for the Doctoral Program of Higher Education of China (Gant No 200610001023).

Analysis of prompt fission neutron spectrum and multiplicity for 237Np(n, f) in the frame of multi-modal Los Alamos model

Zheng Na(郑娜), Ding Yi(丁毅), Zhong Chun-Lai(钟春来), Chen Jin-Xiang(陈金象), and Fan Tie-Shuan(樊铁栓)†   

  1. State Key Laboratory of Nuclear Physics and Nuclear Technology and School of Physics, Peking University, Beijing 100871, China
  • Received:2008-12-01 Revised:2008-12-04 Online:2009-04-20 Published:2009-04-20
  • Supported by:
    Project supported by the State Key Development Program for Basic Research of China (Grant Nos 2008CB717803 and 2007ID103) and the Research Fund for the Doctoral Program of Higher Education of China (Gant No 200610001023).

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摘要： The improved version of Los Alamos model with the multi-modal fission approach is used to analyse the prompt fission neutron spectrum and multiplicity for the neutron-induced fission of 237Np. The spectra of neutrons emitted from fragments for the three most dominant fission modes (standard I, standard II and superlong) are calculated separately and the total spectrum is synthesized. The multi-modal parameters contained in the spectrum model are determined on the basis of experimental data of fission fragment mass distributions. The calculated total prompt fission neutron spectrum and multiplicity are better agreement with the experimental data than those obtained from the conventional treatment of the Los Alamos model.

关键词: 237Np(n, f), prompt neutron spectrum, neutron multiplicity, multi-modal model, Los Alamos model

Abstract: The improved version of Los Alamos model with the multi-modal fission approach is used to analyse the prompt fission neutron spectrum and multiplicity for the neutron-induced fission of 237Np. The spectra of neutrons emitted from fragments for the three most dominant fission modes (standard I, standard II and superlong) are calculated separately and the total spectrum is synthesized. The multi-modal parameters contained in the spectrum model are determined on the basis of experimental data of fission fragment mass distributions. The calculated total prompt fission neutron spectrum and multiplicity are better agreement with the experimental data than those obtained from the conventional treatment of the Los Alamos model.

Key words: 237Np(n, f), prompt neutron spectrum, neutron multiplicity, multi-modal model, Los Alamos model

中图分类号:  (Neutron-induced fission)

  • 25.85.Ec
25.40.-h (Nucleon-induced reactions) 27.90.+b (A ≥ 220)