Correlations of neutron multiplicity and $\gamma$ -ray multiplicity with fragment mass and total kinetic energy in spontaneous fission of ${}^{252}\mathrm{Cf}$

Journal Article · 08 January 2016 · Physical Review C

DOI: https://doi.org/10.1103/PhysRevC.93.014606 · OSTI ID:1239210

Wang, Taofeng ^[1]; Li, Guangwu ^[2]; Zhu, Liping ^[2]; Meng, Qinghua ^[2]; Wang, Liming ^[2]; Han, Hongyin ^[2]; Zhang, Wenhui ^[2]; Xia, Haihong ^[2]; Hou, Long ^[2]; Vogt, Ramona ^[3]; Randrup, Jørgen ^[4]

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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

The dependence of correlations of neutron multiplicity ν and γ-ray multiplicity M_γ in spontaneous fission of ²⁵²Cf on fragment mass A* and total kinetic energy (TKE) have been investigated by employing the ratio of M_γ/ν and the form of M_γ(ν). We show for the first time that M_γ 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 M_γ/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 M_γ(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.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation (NA-20); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
• Grant/Contract Number: AC52-07NA27344; AC02-05CH11231
• OSTI ID: 1239210
• Report Number(s): LLNL-JRNL--678280
• Journal Information: Physical Review C, Journal Name: Physical Review C Journal Issue: 1 Vol. 93; ISSN PRVCAN; ISSN 2469-9985
• Publisher: American Physical Society (APS)Copyright Statement
• Country of Publication: United States
• Language: English