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

Abstract

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];  [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:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1458658
Alternate Identifier(s):
OSTI ID: 1435380
Report Number(s):
LLNL-JRNL-745252
Journal ID: ISSN 2469-9985; PRVCAN; 900716
Grant/Contract Number:
AC52-07NA27344; AC52-06NA25396; NA0002534; AC02-05CH11231
Resource Type:
Journal Article: 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)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Marcath, Matthew J., Haight, Robert C., Vogt, Ramona, Devlin, Matthew, 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., 2018. Web. doi:10.1103/PhysRevC.97.044622.
Marcath, Matthew J., Haight, Robert C., Vogt, Ramona, Devlin, Matthew, 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, Talou, Patrick, Stetcu, Ionel, Randrup, Jorgen, Schuster, Patricia F., Clarke, Shaun D., and Pozzi, Sara A.. Mon . "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 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 = {Mon Apr 30 00:00:00 EDT 2018},
month = {Mon Apr 30 00:00:00 EDT 2018}
}

Journal Article:
Free Publicly Available Full Text
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