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Title: Correlations of neutron multiplicity and γ -ray multiplicity with fragment mass and total kinetic energy in spontaneous fission of Cf 252

Abstract

The dependence of correlations of neutron multiplicity ν and γ-ray multiplicity Mγ in spontaneous fission of 252Cf on fragment mass A* and total kinetic energy (TKE) have been investigated by employing the ratio of Mγ/ν and the form of Mγ(ν). We show for the first time that Mγ and ν have a complex correlation for heavy fragment masses, while there is a positive dependence of Mγ for light fragment masses and for near-symmetric mass splits. The ratio Mγ/ν exhibits strong shell effects for neutron magic number N=50 and near doubly magic number shell closure at Z=50 and N=82. The γ-ray multiplicity Mγ has a maximum for TKE=165-170 MeV. Above 170 MeV Mγ(TKE) is approximately linear, while it deviates significantly from a linear dependence at lower TKE. The correlation between the average neutron and γ-ray multiplicities can be partly reproduced by model calculations.

Authors:
 [1];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [3];  [4]
  1. Beihang Univ., Beijing (China). School of Physics and Nuclear Energy Engineering; International Research Center for Nuclei and Particles in the Cosmos, Beijing (China)
  2. China Institute of Atomic Energy, Beijing (China)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Nuclear and Chemical Sciences Division; Univ. of California, Davis, CA (United States). Physics Dept.
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Nuclear Science Division
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation; USDOE Office of Science (SC), Nuclear Physics (NP)
OSTI Identifier:
1239210
Alternate Identifier(s):
OSTI ID: 1234280; OSTI ID: 1423590
Report Number(s):
LLNL-JRNL-678280
Journal ID: ISSN 2469-9985; PRVCAN
Grant/Contract Number:  
AC52-07NA27344; AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 93; Journal Issue: 1; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Nuclear Physics

Citation Formats

Wang, Taofeng, Li, Guangwu, Zhu, Liping, Meng, Qinghua, Wang, Liming, Han, Hongyin, Zhang, Wenhui, Xia, Haihong, Hou, Long, Vogt, Ramona, and Randrup, Jørgen. Correlations of neutron multiplicity and γ -ray multiplicity with fragment mass and total kinetic energy in spontaneous fission of Cf252. United States: N. p., 2016. Web. doi:10.1103/PhysRevC.93.014606.
Wang, Taofeng, Li, Guangwu, Zhu, Liping, Meng, Qinghua, Wang, Liming, Han, Hongyin, Zhang, Wenhui, Xia, Haihong, Hou, Long, Vogt, Ramona, & Randrup, Jørgen. Correlations of neutron multiplicity and γ -ray multiplicity with fragment mass and total kinetic energy in spontaneous fission of Cf252. United States. doi:10.1103/PhysRevC.93.014606.
Wang, Taofeng, Li, Guangwu, Zhu, Liping, Meng, Qinghua, Wang, Liming, Han, Hongyin, Zhang, Wenhui, Xia, Haihong, Hou, Long, Vogt, Ramona, and Randrup, Jørgen. Fri . "Correlations of neutron multiplicity and γ -ray multiplicity with fragment mass and total kinetic energy in spontaneous fission of Cf252". United States. doi:10.1103/PhysRevC.93.014606. https://www.osti.gov/servlets/purl/1239210.
@article{osti_1239210,
title = {Correlations of neutron multiplicity and γ -ray multiplicity with fragment mass and total kinetic energy in spontaneous fission of Cf252},
author = {Wang, Taofeng and Li, Guangwu and Zhu, Liping and Meng, Qinghua and Wang, Liming and Han, Hongyin and Zhang, Wenhui and Xia, Haihong and Hou, Long and Vogt, Ramona and Randrup, Jørgen},
abstractNote = {The dependence of correlations of neutron multiplicity ν and γ-ray multiplicity Mγ in spontaneous fission of 252Cf on fragment mass A* and total kinetic energy (TKE) have been investigated by employing the ratio of Mγ/ν and the form of Mγ(ν). We show for the first time that Mγ and ν have a complex correlation for heavy fragment masses, while there is a positive dependence of Mγ for light fragment masses and for near-symmetric mass splits. The ratio Mγ/ν exhibits strong shell effects for neutron magic number N=50 and near doubly magic number shell closure at Z=50 and N=82. The γ-ray multiplicity Mγ has a maximum for TKE=165-170 MeV. Above 170 MeV Mγ(TKE) is approximately linear, while it deviates significantly from a linear dependence at lower TKE. The correlation between the average neutron and γ-ray multiplicities can be partly reproduced by model calculations.},
doi = {10.1103/PhysRevC.93.014606},
journal = {Physical Review C},
number = 1,
volume = 93,
place = {United States},
year = {2016},
month = {1}
}

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FIG. 1 FIG. 1: Schematic diagram of the experimental setup.

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    Works referencing / citing this record:

    Neutron and γ multiplicities as a function of incident neutron energy for the Np 237 ( n , f ) reaction
    journal, October 2019


    Prompt neutron multiplicity distributions inferred from γ -ray and fission fragment energy measurements
    journal, November 2019


    Fission dynamics of Cf 252
    journal, May 2017


    Statistical study of the prompt-fission γ -ray spectrum for U 238 ( n ,   f ) in the fast-neutron region
    journal, July 2018


    Correlated prompt fission data in transport simulations
    journal, January 2018


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