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Title: Measured and simulated Cf ( sf ) 252 prompt neutron-photon competition

We present that neutrons and photons are characteristically emitted during the nuclear fission process when a deformed, neutron-rich nucleus divides into two fragments that then deexcite. During deexcitation, neutrons are emitted first, followed by photons; this process gives rise to correlated emissions. Few data exist on event-by-event neutron-photon correlation. In this work, Cf ( sf ) 252 neutron and photon correlations were measured with an array of 45 liquid organic scintillation detectors and a fission chamber. The measured correlations are compared with MCPNX-PoliMi simulations using the built-in model and two event-by-event fission models, CGMF and FREYA, which predict correlations in prompt emissions from fission. Lastly, experimental results suggest weak neutron-photon competition during fragment deexcitation.
Authors:
 [1] ;  [2] ;  [3] ;  [2] ;  [2] ; ORCiD logo [2] ;  [4] ;  [1] ;  [1] ;  [1]
  1. Univ. of Michigan, Ann Arbor, MI (United States). Department of Nuclear Engineering and Radiological Sciences
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Physics Division; Univ. of California, Davis, CA (United States). Physics Department
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Nuclear Science Division
Publication Date:
Report Number(s):
LLNL-JRNL-745252; LA-UR-18-20825
Journal ID: ISSN 2469-9985; PRVCAN; 900716
Grant/Contract Number:
AC52-07NA27344; AC52-06NA25396; NA0002534; AC02-05CH11231
Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 97; Journal Issue: 4; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP) (NA-10)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
OSTI Identifier:
1458658
Alternate Identifier(s):
OSTI ID: 1435380; OSTI ID: 1463555

Marcath, Matthew J., Haight, Robert C., Vogt, Ramona, Devlin, Matthew James, Talou, Patrick, Stetcu, Ionel, Randrup, Jorgen, Schuster, Patricia F., Clarke, Shaun D., and Pozzi, Sara A.. Measured and simulated Cf(sf)252 prompt neutron-photon competition. United States: N. p., Web. doi:10.1103/PhysRevC.97.044622.
Marcath, Matthew J., Haight, Robert C., Vogt, Ramona, Devlin, Matthew James, Talou, Patrick, Stetcu, Ionel, Randrup, Jorgen, Schuster, Patricia F., Clarke, Shaun D., & Pozzi, Sara A.. Measured and simulated Cf(sf)252 prompt neutron-photon competition. United States. doi:10.1103/PhysRevC.97.044622.
Marcath, Matthew J., Haight, Robert C., Vogt, Ramona, Devlin, Matthew James, Talou, Patrick, Stetcu, Ionel, Randrup, Jorgen, Schuster, Patricia F., Clarke, Shaun D., and Pozzi, Sara A.. 2018. "Measured and simulated Cf(sf)252 prompt neutron-photon competition". United States. doi:10.1103/PhysRevC.97.044622.
@article{osti_1458658,
title = {Measured and simulated Cf(sf)252 prompt neutron-photon competition},
author = {Marcath, Matthew J. and Haight, Robert C. and Vogt, Ramona and Devlin, Matthew James and Talou, Patrick and Stetcu, Ionel and Randrup, Jorgen and Schuster, Patricia F. and Clarke, Shaun D. and Pozzi, Sara A.},
abstractNote = {We present that neutrons and photons are characteristically emitted during the nuclear fission process when a deformed, neutron-rich nucleus divides into two fragments that then deexcite. During deexcitation, neutrons are emitted first, followed by photons; this process gives rise to correlated emissions. Few data exist on event-by-event neutron-photon correlation. In this work, Cf(sf)252 neutron and photon correlations were measured with an array of 45 liquid organic scintillation detectors and a fission chamber. The measured correlations are compared with MCPNX-PoliMi simulations using the built-in model and two event-by-event fission models, CGMF and FREYA, which predict correlations in prompt emissions from fission. Lastly, experimental results suggest weak neutron-photon competition during fragment deexcitation.},
doi = {10.1103/PhysRevC.97.044622},
journal = {Physical Review C},
number = 4,
volume = 97,
place = {United States},
year = {2018},
month = {4}
}

Works referenced in this record:

Pulse Shape Discrimination in a Plastic Scintillator
journal, June 1960
  • Brooks, F. D.; Pringle, R. W.; Funt, B. L.
  • IRE Transactions on Nuclear Science, Vol. 7, Issue 2-3, p. 35-38
  • DOI: 10.1109/TNS2.1960.4315733