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Title: High resolution measurement of tagged two-neutron energy and angle correlations in 252Cf (sf)

Journal Article · · Physical Review. C
ORCiD logo [1];  [1];  [1];  [1]; ORCiD logo [2];  [2];  [3];  [2]; ORCiD logo [2]; ORCiD logo [2];  [4];  [1]
  1. Univ. of Michigan, Ann Arbor, MI (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of California, Davis, CA (United States)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
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Background: Spontaneous fission events emit prompt neutrons correlated with one another in emission angle and energy. Measurements of these correlations can shed light on the partitioning of the excitation energy between the fragments, even if they are not directly measured. Purpose: We explore the relationship in energy and angle between correlated prompt neutrons emitted from 252Cf spontaneous fission. Methods: Measurements with the Chi-Nu array provide experimental data for coincident neutrons tagged with a fission chamber signal with 10° angular resolution and 1-ns timing resolution for time-of-flight energy calculations. The experimental results are compared to simulations produced by the fission event generators CGMF, FREYA, and MCNPX-POLIMI IPOL(1) = 1. Results: We find that the measurements and the simulations all exhibit anisotropic neutron emission, although differences between fission event generators are evident. In conclusion, this work shows that the dependence of detected neutron energy on the energy of another neutron detected in coincidence, although weak, is non-negligible, indicating that there may be correlations in energy between two neutrons emitted in the same fission event.

Research Organization:
Univ. of Michigan, Ann Arbor, MI (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA), Office of Nonproliferation and Verification Research and Development (NA-22); USDOE Office of Science (SC), Nuclear Physics (NP); USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP)
Grant/Contract Number:
NA0002534; AC52-06NA25396; AC52-07NA27344; AC02-05CH11231; 89233218CNA000001
OSTI ID:
1798651
Alternate ID(s):
OSTI ID: 1525289; OSTI ID: 1546465; OSTI ID: 1557756; OSTI ID: 1608098
Report Number(s):
LA-UR-18-31242; LLNL-JRNL-762491; TRN: US2210708
Journal Information:
Physical Review. C, Vol. 100, Issue 1; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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