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

Abstract

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.

Authors:
 [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)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP) (NA-10)
OSTI Identifier:
1557756
Alternate Identifier(s):
OSTI ID: 1546465
Report Number(s):
LA-UR-18-31242
Journal ID: ISSN 2469-9985; PRVCAN
Grant/Contract Number:  
89233218CNA000001; AC52-06NA25396; AC52-07NA27344; AC02-05CH11231; NA0002534
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 100; 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

Citation Formats

Schuster, Patricia, Marcath, Matthew James, Marin, S., Clarke, S. D., Devlin, Matthew James, Haight, Robert Cameron, Vogt, Ramona, Talou, P., Stetcu, Ionel, Kawano, Toshihiko, Randrup, Jorgen, and Pozzi, Sara Antonia. High resolution measurement of tagged two-neutron energy and angle correlations in Cf252 (sf). United States: N. p., 2019. Web. doi:10.1103/PhysRevC.100.014605.
Schuster, Patricia, Marcath, Matthew James, Marin, S., Clarke, S. D., Devlin, Matthew James, Haight, Robert Cameron, Vogt, Ramona, Talou, P., Stetcu, Ionel, Kawano, Toshihiko, Randrup, Jorgen, & Pozzi, Sara Antonia. High resolution measurement of tagged two-neutron energy and angle correlations in Cf252 (sf). United States. doi:10.1103/PhysRevC.100.014605.
Schuster, Patricia, Marcath, Matthew James, Marin, S., Clarke, S. D., Devlin, Matthew James, Haight, Robert Cameron, Vogt, Ramona, Talou, P., Stetcu, Ionel, Kawano, Toshihiko, Randrup, Jorgen, and Pozzi, Sara Antonia. Mon . "High resolution measurement of tagged two-neutron energy and angle correlations in Cf252 (sf)". United States. doi:10.1103/PhysRevC.100.014605.
@article{osti_1557756,
title = {High resolution measurement of tagged two-neutron energy and angle correlations in Cf252 (sf)},
author = {Schuster, Patricia and Marcath, Matthew James and Marin, S. and Clarke, S. D. and Devlin, Matthew James and Haight, Robert Cameron and Vogt, Ramona and Talou, P. and Stetcu, Ionel and Kawano, Toshihiko and Randrup, Jorgen and Pozzi, Sara Antonia},
abstractNote = {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.},
doi = {10.1103/PhysRevC.100.014605},
journal = {Physical Review C},
issn = {2469-9985},
number = 1,
volume = 100,
place = {United States},
year = {2019},
month = {7}
}

Journal Article:
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