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

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.

doi:10.1103/PhysRevC.97.044622

Title: Measured and simulated ${}^{252}{Cf (sf)}$ prompt neutron-photon competition

Journal Article · 29 April 2018 · Physical Review C

DOI: https://doi.org/10.1103/PhysRevC.97.044622 · OSTI ID:1458658

Marcath, Matthew J. ^[1]; Haight, Robert C. ^[2]; Vogt, Ramona ^[3]; Devlin, Matthew James ^[2]; Talou, Patrick ^[2];

^[2]; Randrup, Jorgen ^[4]; Schuster, Patricia F. ^[1]; Clarke, Shaun D. ^[1]; Pozzi, Sara A. ^[1]

Univ. of Michigan, Ann Arbor, MI (United States). Department of Nuclear Engineering and Radiological Sciences
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Physics Division; Univ. of California, Davis, CA (United States). Physics Department
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Nuclear Science Division

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, ${}^{252}{Cf (sf)}$ 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.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Univ. of Michigan, Ann Arbor, MI (United States)

Sponsoring Organization:: USDOE; USDOE National Nuclear Security Administration (NNSA); USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP) (NA-10); USDOE National Nuclear Security Administration (NNSA), Office of Nonproliferation and Verification Research and Development (NA-22); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)

Grant/Contract Number:: AC02-05CH11231; AC52-06NA25396; AC52-07NA27344; NA0002534

OSTI ID:: 1458658

Report Number(s):: LA-UR--18-20825; LLNL-JRNL--745252; 900716

Journal Information:: Physical Review C, Journal Name: Physical Review C Journal Issue: 4 Vol. 97; ISSN PRVCAN; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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